4 years agomm/vmscan: wake up flushers for legacy cgroups too
Andrey Ryabinin [Thu, 22 Mar 2018 23:17:42 +0000 (16:17 -0700)]
mm/vmscan: wake up flushers for legacy cgroups too

Commit 726d061fbd36 ("mm: vmscan: kick flushers when we encounter dirty
pages on the LRU") added flusher invocation to shrink_inactive_list()
when many dirty pages on the LRU are encountered.

However, shrink_inactive_list() doesn't wake up flushers for legacy
cgroup reclaim, so the next commit bbef938429f5 ("mm: vmscan: remove old
flusher wakeup from direct reclaim path") removed the only source of
flusher's wake up in legacy mem cgroup reclaim path.

This leads to premature OOM if there is too many dirty pages in cgroup:
    # mkdir /sys/fs/cgroup/memory/test
    # echo $$ > /sys/fs/cgroup/memory/test/tasks
    # echo 50M > /sys/fs/cgroup/memory/test/memory.limit_in_bytes
    # dd if=/dev/zero of=tmp_file bs=1M count=100

    dd invoked oom-killer: gfp_mask=0x14000c0(GFP_KERNEL), nodemask=(null), order=0, oom_score_adj=0

    Call Trace:

    Task in /test killed as a result of limit of /test
    memory: usage 51200kB, limit 51200kB, failcnt 73
    memory+swap: usage 51200kB, limit 9007199254740988kB, failcnt 0
    kmem: usage 296kB, limit 9007199254740988kB, failcnt 0
    Memory cgroup stats for /test: cache:49632KB rss:1056KB rss_huge:0KB shmem:0KB
            mapped_file:0KB dirty:49500KB writeback:0KB swap:0KB inactive_anon:0KB
    active_anon:1168KB inactive_file:24760KB active_file:24960KB unevictable:0KB
    Memory cgroup out of memory: Kill process 3861 (bash) score 88 or sacrifice child
    Killed process 3876 (dd) total-vm:8484kB, anon-rss:1052kB, file-rss:1720kB, shmem-rss:0kB
    oom_reaper: reaped process 3876 (dd), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB

Wake up flushers in legacy cgroup reclaim too.

Fixes: bbef938429f5 ("mm: vmscan: remove old flusher wakeup from direct reclaim path")
Signed-off-by: Andrey Ryabinin <>
Tested-by: Shakeel Butt <>
Acked-by: Michal Hocko <>
Cc: Mel Gorman <>
Cc: Tejun Heo <>
Cc: Johannes Weiner <>
Cc: <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
4 years agoRevert "mm: page_alloc: skip over regions of invalid pfns where possible"
Daniel Vacek [Thu, 22 Mar 2018 23:17:38 +0000 (16:17 -0700)]
Revert "mm: page_alloc: skip over regions of invalid pfns where possible"

This reverts commit b92df1de5d28 ("mm: page_alloc: skip over regions of
invalid pfns where possible").  The commit is meant to be a boot init
speed up skipping the loop in memmap_init_zone() for invalid pfns.

But given some specific memory mapping on x86_64 (or more generally
theoretically anywhere but on arm with CONFIG_HAVE_ARCH_PFN_VALID) the
implementation also skips valid pfns which is plain wrong and causes
'kernel BUG at mm/page_alloc.c:1389!'

  crash> log | grep -e BUG -e RIP -e Call.Trace -e move_freepages_block -e rmqueue -e freelist -A1
  kernel BUG at mm/page_alloc.c:1389!
  invalid opcode: 0000 [#1] SMP
  RIP: 0010: move_freepages+0x15e/0x160
  Call Trace:

  crash> page_init_bug -v | grep RAM
  <struct resource 0xffff88067fffd2f8>          1000 -        9bfff       System RAM (620.00 KiB)
  <struct resource 0xffff88067fffd3a0>        100000 -     430bffff       System RAM (  1.05 GiB = 1071.75 MiB = 1097472.00 KiB)
  <struct resource 0xffff88067fffd410>      4b0c8000 -     4bf9cfff       System RAM ( 14.83 MiB = 15188.00 KiB)
  <struct resource 0xffff88067fffd480>      4bfac000 -     646b1fff       System RAM (391.02 MiB = 400408.00 KiB)
  <struct resource 0xffff88067fffd560>      7b788000 -     7b7fffff       System RAM (480.00 KiB)
  <struct resource 0xffff88067fffd640>     100000000 -    67fffffff       System RAM ( 22.00 GiB)

  crash> page_init_bug | head -6
  <struct resource 0xffff88067fffd560>      7b788000 -     7b7fffff       System RAM (480.00 KiB)
  <struct page 0xffffea0001ede200>   1fffff00000000  0 <struct pglist_data 0xffff88047ffd9000> 1 <struct zone 0xffff88047ffd9800> DMA32          4096    1048575
  <struct page 0xffffea0001ede200>       505736 505344 <struct page 0xffffea0001ed8000> 505855 <struct page 0xffffea0001edffc0>
  <struct page 0xffffea0001ed8000>                0  0 <struct pglist_data 0xffff88047ffd9000> 0 <struct zone 0xffff88047ffd9000> DMA               1       4095
  <struct page 0xffffea0001edffc0>   1fffff00000400  0 <struct pglist_data 0xffff88047ffd9000> 1 <struct zone 0xffff88047ffd9800> DMA32          4096    1048575
  BUG, zones differ!

  crash> kmem -p 77fff000 78000000 7b5ff000 7b600000 7b787000 7b788000
  ffffea0001e00000  78000000                0        0  0 0
  ffffea0001ed7fc0  7b5ff000                0        0  0 0
  ffffea0001ed8000  7b600000                0        0  0 0       <<<<
  ffffea0001ede1c0  7b787000                0        0  0 0
  ffffea0001ede200  7b788000                0        0  1 1fffff00000000

Fixes: b92df1de5d28 ("mm: page_alloc: skip over regions of invalid pfns where possible")
Signed-off-by: Daniel Vacek <>
Acked-by: Ard Biesheuvel <>
Acked-by: Michal Hocko <>
Reviewed-by: Andrew Morton <>
Cc: Vlastimil Babka <>
Cc: Mel Gorman <>
Cc: Pavel Tatashin <>
Cc: Paul Burton <>
Cc: <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
4 years agomm/shmem: do not wait for lock_page() in shmem_unused_huge_shrink()
Kirill A. Shutemov [Thu, 22 Mar 2018 23:17:35 +0000 (16:17 -0700)]
mm/shmem: do not wait for lock_page() in shmem_unused_huge_shrink()

shmem_unused_huge_shrink() gets called from reclaim path.  Waiting for
page lock may lead to deadlock there.

There was a bug report that may be attributed to this:

Replace lock_page() with trylock_page() and skip the page if we failed
to lock it.  We will get to the page on the next scan.

We can test for the PageTransHuge() outside the page lock as we only
need protection against splitting the page under us.  Holding pin oni
the page is enough for this.

Fixes: 779750d20b93 ("shmem: split huge pages beyond i_size under memory pressure")
Signed-off-by: Kirill A. Shutemov <>
Reported-by: Eric Wheeler <>
Acked-by: Michal Hocko <>
Reviewed-by: Andrew Morton <>
Cc: Tetsuo Handa <>
Cc: Hugh Dickins <>
Cc: <> [4.8+]
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
4 years agomm/thp: do not wait for lock_page() in deferred_split_scan()
Kirill A. Shutemov [Thu, 22 Mar 2018 23:17:31 +0000 (16:17 -0700)]
mm/thp: do not wait for lock_page() in deferred_split_scan()

deferred_split_scan() gets called from reclaim path.  Waiting for page
lock may lead to deadlock there.

Replace lock_page() with trylock_page() and skip the page if we failed
to lock it.  We will get to the page on the next scan.

Fixes: 9a982250f773 ("thp: introduce deferred_split_huge_page()")
Signed-off-by: Kirill A. Shutemov <>
Acked-by: Michal Hocko <>
Cc: <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
4 years agomm/khugepaged.c: convert VM_BUG_ON() to collapse fail
Kirill A. Shutemov [Thu, 22 Mar 2018 23:17:28 +0000 (16:17 -0700)]
mm/khugepaged.c: convert VM_BUG_ON() to collapse fail

khugepaged is not yet able to convert PTE-mapped huge pages back to PMD
mapped.  We do not collapse such pages.  See check

But if between khugepaged_scan_pmd() and __collapse_huge_page_isolate()
somebody managed to instantiate THP in the range and then split the PMD
back to PTEs we would have a problem --
VM_BUG_ON_PAGE(PageCompound(page)) will get triggered.

It's possible since we drop mmap_sem during collapse to re-take for

Replace the VM_BUG_ON() with graceful collapse fail.

Fixes: b1caa957ae6d ("khugepaged: ignore pmd tables with THP mapped with ptes")
Signed-off-by: Kirill A. Shutemov <>
Cc: Laura Abbott <>
Cc: Jerome Marchand <>
Cc: Vlastimil Babka <>
Cc: <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
4 years agox86/mm: implement free pmd/pte page interfaces
Toshi Kani [Thu, 22 Mar 2018 23:17:24 +0000 (16:17 -0700)]
x86/mm: implement free pmd/pte page interfaces

Implement pud_free_pmd_page() and pmd_free_pte_page() on x86, which
clear a given pud/pmd entry and free up lower level page table(s).

The address range associated with the pud/pmd entry must have been
purged by INVLPG.

Fixes: e61ce6ade404e ("mm: change ioremap to set up huge I/O mappings")
Signed-off-by: Toshi Kani <>
Reported-by: Lei Li <>
Cc: Michal Hocko <>
Cc: Thomas Gleixner <>
Cc: Ingo Molnar <>
Cc: "H. Peter Anvin" <>
Cc: Borislav Petkov <>
Cc: Matthew Wilcox <>
Cc: <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
4 years agomm/vmalloc: add interfaces to free unmapped page table
Toshi Kani [Thu, 22 Mar 2018 23:17:20 +0000 (16:17 -0700)]
mm/vmalloc: add interfaces to free unmapped page table

On architectures with CONFIG_HAVE_ARCH_HUGE_VMAP set, ioremap() may
create pud/pmd mappings.  A kernel panic was observed on arm64 systems
with Cortex-A75 in the following steps as described by Hanjun Guo.

 1. ioremap a 4K size, valid page table will build,
 2. iounmap it, pte0 will set to 0;
 3. ioremap the same address with 2M size, pgd/pmd is unchanged,
    then set the a new value for pmd;
 4. pte0 is leaked;
 5. CPU may meet exception because the old pmd is still in TLB,
    which will lead to kernel panic.

This panic is not reproducible on x86.  INVLPG, called from iounmap,
purges all levels of entries associated with purged address on x86.  x86
still has memory leak.

The patch changes the ioremap path to free unmapped page table(s) since
doing so in the unmap path has the following issues:

 - The iounmap() path is shared with vunmap(). Since vmap() only
   supports pte mappings, making vunmap() to free a pte page is an
   overhead for regular vmap users as they do not need a pte page freed

 - Checking if all entries in a pte page are cleared in the unmap path
   is racy, and serializing this check is expensive.

 - The unmap path calls free_vmap_area_noflush() to do lazy TLB purges.
   Clearing a pud/pmd entry before the lazy TLB purges needs extra TLB

Add two interfaces, pud_free_pmd_page() and pmd_free_pte_page(), which
clear a given pud/pmd entry and free up a page for the lower level

This patch implements their stub functions on x86 and arm64, which work
as workaround.

[ fix typo in pmd_free_pte_page() stub]
Fixes: e61ce6ade404e ("mm: change ioremap to set up huge I/O mappings")
Reported-by: Lei Li <>
Signed-off-by: Toshi Kani <>
Cc: Catalin Marinas <>
Cc: Wang Xuefeng <>
Cc: Will Deacon <>
Cc: Hanjun Guo <>
Cc: Michal Hocko <>
Cc: Thomas Gleixner <>
Cc: Ingo Molnar <>
Cc: "H. Peter Anvin" <>
Cc: Borislav Petkov <>
Cc: Matthew Wilcox <>
Cc: Chintan Pandya <>
Cc: <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
4 years agoh8300: remove extraneous __BIG_ENDIAN definition
Arnd Bergmann [Thu, 22 Mar 2018 23:17:17 +0000 (16:17 -0700)]
h8300: remove extraneous __BIG_ENDIAN definition

A bugfix I did earlier caused a build regression on h8300, which defines
the __BIG_ENDIAN macro in a slightly different way than the generic

  arch/h8300/include/asm/byteorder.h:5:0: warning: "__BIG_ENDIAN" redefined

We don't need to define it here, as the same macro is already provided
by the linux/byteorder/big_endian.h, and that version does not conflict.

While this is a v4.16 regression, my earlier patch also got backported
to the 4.14 and 4.15 stable kernels, so we need the fixup there as well.

Fixes: 101110f6271c ("Kbuild: always define endianess in kconfig.h")
Signed-off-by: Arnd Bergmann <>
Cc: Yoshinori Sato <>
Cc: <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
4 years agohugetlbfs: check for pgoff value overflow
Mike Kravetz [Thu, 22 Mar 2018 23:17:13 +0000 (16:17 -0700)]
hugetlbfs: check for pgoff value overflow

A vma with vm_pgoff large enough to overflow a loff_t type when
converted to a byte offset can be passed via the remap_file_pages system
call.  The hugetlbfs mmap routine uses the byte offset to calculate
reservations and file size.

A sequence such as:

  mmap(0x20a00000, 0x600000, 0, 0x66033, -1, 0);
  remap_file_pages(0x20a00000, 0x600000, 0, 0x20000000000000, 0);

will result in the following when task exits/file closed,

  kernel BUG at mm/hugetlb.c:749!
  Call Trace:

The overflowed pgoff value causes hugetlbfs to try to set up a mapping
with a negative range (end < start) that leaves invalid state which
causes the BUG.

The previous overflow fix to this code was incomplete and did not take
the remap_file_pages system call into account.

[ v3]
[ include mmdebug.h]
[ fix -ve left shift count on sh]
Fixes: 045c7a3f53d9 ("hugetlbfs: fix offset overflow in hugetlbfs mmap")
Signed-off-by: Mike Kravetz <>
Reported-by: Nic Losby <>
Acked-by: Michal Hocko <>
Cc: "Kirill A . Shutemov" <>
Cc: Yisheng Xie <>
Cc: <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
4 years agolockdep: fix fs_reclaim warning
Tetsuo Handa [Thu, 22 Mar 2018 23:17:10 +0000 (16:17 -0700)]
lockdep: fix fs_reclaim warning

Dave Jones reported fs_reclaim lockdep warnings.

  WARNING: possible recursive locking detected
  4.15.0-rc9-backup-debug+ #1 Not tainted
  sshd/24800 is trying to acquire lock:
   (fs_reclaim){+.+.}, at: [<0000000084f438c2>] fs_reclaim_acquire.part.102+0x5/0x30

  but task is already holding lock:
   (fs_reclaim){+.+.}, at: [<0000000084f438c2>] fs_reclaim_acquire.part.102+0x5/0x30

  other info that might help us debug this:
   Possible unsafe locking scenario:


   *** DEADLOCK ***

   May be due to missing lock nesting notation

  2 locks held by sshd/24800:
   #0:  (sk_lock-AF_INET6){+.+.}, at: [<000000001a069652>] tcp_sendmsg+0x19/0x40
   #1:  (fs_reclaim){+.+.}, at: [<0000000084f438c2>] fs_reclaim_acquire.part.102+0x5/0x30

  stack backtrace:
  CPU: 3 PID: 24800 Comm: sshd Not tainted 4.15.0-rc9-backup-debug+ #1
  Call Trace:

This warning is caused by commit d92a8cfcb37e ("locking/lockdep:
Rework FS_RECLAIM annotation") which replaced the use of
lockdep_{set,clear}_current_reclaim_state() in __perform_reclaim()
and lockdep_trace_alloc() in slab_pre_alloc_hook() with
fs_reclaim_acquire()/ fs_reclaim_release().

Since __kmalloc_reserve() from __alloc_skb() adds __GFP_NOMEMALLOC |
__GFP_NOWARN to gfp_mask, and all reclaim path simply propagates
__GFP_NOMEMALLOC, fs_reclaim_acquire() in slab_pre_alloc_hook() is
trying to grab the 'fake' lock again when __perform_reclaim() already
grabbed the 'fake' lock.


  /* this guy won't enter reclaim */
  if ((current->flags & PF_MEMALLOC) && !(gfp_mask & __GFP_NOMEMALLOC))
          return false;

test which causes slab_pre_alloc_hook() to try to grab the 'fake' lock
was added by commit cf40bd16fdad ("lockdep: annotate reclaim context
(__GFP_NOFS)").  But that test is outdated because PF_MEMALLOC thread
won't enter reclaim regardless of __GFP_NOMEMALLOC after commit
341ce06f69ab ("page allocator: calculate the alloc_flags for allocation
only once") added the PF_MEMALLOC safeguard (

  /* Avoid recursion of direct reclaim */
  if (p->flags & PF_MEMALLOC)
          goto nopage;

in __alloc_pages_slowpath()).

Thus, let's fix outdated test by removing __GFP_NOMEMALLOC test and
allow __need_fs_reclaim() to return false.

Fixes: d92a8cfcb37ecd13 ("locking/lockdep: Rework FS_RECLAIM annotation")
Signed-off-by: Tetsuo Handa <>
Reported-by: Dave Jones <>
Tested-by: Dave Jones <>
Cc: Peter Zijlstra <>
Cc: Nick Piggin <>
Cc: Ingo Molnar <>
Cc: Nikolay Borisov <>
Cc: Michal Hocko <>
Cc: <> [4.14+]
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
4 years agoMAINTAINERS: update Mark Fasheh's e-mail
Mark Fasheh [Thu, 22 Mar 2018 23:17:05 +0000 (16:17 -0700)]
MAINTAINERS: update Mark Fasheh's e-mail

I'd like to use my personal e-mail for Ocfs2 requests and review.

Signed-off-by: Mark Fasheh <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
4 years agomm/mempolicy.c: avoid use uninitialized preferred_node
Yisheng Xie [Thu, 22 Mar 2018 23:17:02 +0000 (16:17 -0700)]
mm/mempolicy.c: avoid use uninitialized preferred_node

Alexander reported a use of uninitialized memory in __mpol_equal(),
which is caused by incorrect use of preferred_node.

When mempolicy in mode MPOL_PREFERRED with flags MPOL_F_LOCAL, it uses
numa_node_id() instead of preferred_node, however, __mpol_equal() uses
preferred_node without checking whether it is MPOL_F_LOCAL or not.

[ slight comment tweak]
Fixes: fc36b8d3d819 ("mempolicy: use MPOL_F_LOCAL to Indicate Preferred Local Policy")
Signed-off-by: Yisheng Xie <>
Reported-by: Alexander Potapenko <>
Tested-by: Alexander Potapenko <>
Reviewed-by: Andrew Morton <>
Cc: Dmitriy Vyukov <>
Cc: Vlastimil Babka <>
Cc: Michal Hocko <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
4 years agoMerge tag 'clk-fixes-for-linus' of git://
Linus Torvalds [Wed, 21 Mar 2018 00:44:27 +0000 (17:44 -0700)]
Merge tag 'clk-fixes-for-linus' of git://git./linux/kernel/git/clk/linux

Pull clk fixes from Stephen Boyd:
 "A late collection of fixes for regressions seen this release cycle.
  Normally I send this earlier than now but real life got in the way.
  Things are back to normal now.

  There's the normal set of SoC driver fixes: i.MX boot warning, TI
  display clks, allwinner clk ops being wrong (fun), driver probe
  badness on error paths, correctness fix for the new aspeed driver, and
  even a fix for a race condition in the bcm2835 clk driver.

  At the core framework level we also got some fixes for the clk phase
  API caching at the wrong time, better handling of the enabled state of
  orphan clks, and a fix for a newly introduced bug in how we handle
  rate calculations for pass-through clks"

* tag 'clk-fixes-for-linus' of git://
  clk: bcm2835: Protect sections updating shared registers
  clk: bcm2835: Fix ana->maskX definitions
  clk: aspeed: Prevent reset if clock is enabled
  clk: aspeed: Fix is_enabled for certain clocks
  clk: qcom: msm8916: Fix return value check in qcom_apcs_msm8916_clk_probe()
  clk: hisilicon: hi3660:Fix potential NULL dereference in hi3660_stub_clk_probe()
  clk: fix determine rate error with pass-through clock
  clk: migrate the count of orphaned clocks at init
  clk: update cached phase to respect the fact when setting phase
  clk: ti: am43xx: add set-rate-parent support for display clkctrl clock
  clk: ti: am33xx: add set-rate-parent support for display clkctrl clock
  clk: ti: clkctrl: add support for CLK_SET_RATE_PARENT flag
  clk: imx51-imx53: Fix UART4/5 registration on i.MX50 and i.MX53
  clk: sunxi-ng: a31: Fix CLK_OUT_* clock ops

4 years agoMerge tag 'for-linus' of git://
Linus Torvalds [Wed, 21 Mar 2018 00:39:07 +0000 (17:39 -0700)]
Merge tag 'for-linus' of git://git./linux/kernel/git/rdma/rdma

Pull rdma fixes from Jason Gunthorpe:
 "Not much exciting here, almost entirely syzkaller fixes.

  This is going to be on ongoing theme for some time, I think. Both
  Google and Mellanox are now running syzkaller on different parts of
  the user API.


   - Many bug fixes related to syzkaller from Leon Romanovsky. These are
     still for the mlx driver and ucma interface.

   - Fix a situation with port reuse for iWarp, discovered during
     scale-up testing

   - Bug fixes for the profile and restrack patches accepted during this
     merge window

   - Compile warning cleanups from Arnd, this is apparently the last
     warning to make 32 bit builds quiet"

* tag 'for-linus' of git://
  RDMA/ucma: Ensure that CM_ID exists prior to access it
  RDMA/verbs: Remove restrack entry from XRCD structure
  RDMA/ucma: Fix use-after-free access in ucma_close
  RDMA/ucma: Check AF family prior resolving address
  infiniband: bnxt_re: use BIT_ULL() for 64-bit bit masks
  infiniband: qplib_fp: fix pointer cast
  IB/mlx5: Fix cleanup order on unload
  RDMA/ucma: Don't allow join attempts for unsupported AF family
  RDMA/ucma: Fix access to non-initialized CM_ID object
  RDMA/core: Do not use invalid destination in determining port reuse
  RDMA/mlx5: Fix crash while accessing garbage pointer and freed memory
  IB/mlx5: Fix integer overflows in mlx5_ib_create_srq
  IB/mlx5: Fix out-of-bounds read in create_raw_packet_qp_rq

4 years agoMerge tag 'scsi-fixes' of git://
Linus Torvalds [Tue, 20 Mar 2018 23:59:01 +0000 (16:59 -0700)]
Merge tag 'scsi-fixes' of git://git./linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:

 - one driver patch (qla2xxx) which fixes a problem caused by an
   existing regression fix (FCP discovery is failing)

 - one generic fix to a longstanding bug in libsas that causes I/O
   eventually to hang to the device in the face of ATA error recovery.

* tag 'scsi-fixes' of git://
  scsi: qla2xxx: Remove FC_NO_LOOP_ID for FCP and FC-NVMe Discovery
  scsi: libsas: defer ata device eh commands to libata

4 years agoMerge tag 'nfsd-4.16-1' of git://
Linus Torvalds [Tue, 20 Mar 2018 23:10:26 +0000 (16:10 -0700)]
Merge tag 'nfsd-4.16-1' of git://

Pull nfsd fix from Bruce Fields:
 "Just one fix for an occasional panic from Jeff Layton"

* tag 'nfsd-4.16-1' of git://
  nfsd: remove blocked locks on client teardown

4 years agokvm/x86: fix icebp instruction handling
Linus Torvalds [Tue, 20 Mar 2018 19:16:59 +0000 (12:16 -0700)]
kvm/x86: fix icebp instruction handling

The undocumented 'icebp' instruction (aka 'int1') works pretty much like
'int3' in the absense of in-circuit probing equipment (except,
obviously, that it raises #DB instead of raising #BP), and is used by
some validation test-suites as such.

But Andy Lutomirski noticed that his test suite acted differently in kvm
than on bare hardware.

The reason is that kvm used an inexact test for the icebp instruction:
it just assumed that an all-zero VM exit qualification value meant that
the VM exit was due to icebp.

That is not unlike the guess that do_debug() does for the actual
exception handling case, but it's purely a heuristic, not an absolute
rule.  do_debug() does it because it wants to ascribe _some_ reasons to
the #DB that happened, and an empty %dr6 value means that 'icebp' is the
most likely casue and we have no better information.

But kvm can just do it right, because unlike the do_debug() case, kvm
actually sees the real reason for the #DB in the VM-exit interruption
information field.

So instead of relying on an inexact heuristic, just use the actual VM
exit information that says "it was 'icebp'".

Right now the 'icebp' instruction isn't technically documented by Intel,
but that will hopefully change.  The special "privileged software
exception" information _is_ actually mentioned in the Intel SDM, even
though the cause of it isn't enumerated.

Reported-by: Andy Lutomirski <>
Tested-by: Paolo Bonzini <>
Signed-off-by: Linus Torvalds <>
4 years agoRDMA/ucma: Ensure that CM_ID exists prior to access it
Leon Romanovsky [Tue, 20 Mar 2018 15:05:13 +0000 (17:05 +0200)]
RDMA/ucma: Ensure that CM_ID exists prior to access it

Prior to access UCMA commands, the context should be initialized
and connected to CM_ID with ucma_create_id(). In case user skips
this step, he can provide non-valid ctx without CM_ID and cause
to multiple NULL dereferences.

Also there are situations where the create_id can be raced with
other user access, ensure that the context is only shared to
other threads once it is fully initialized to avoid the races.

[  109.088108] BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
[  109.090315] IP: ucma_connect+0x138/0x1d0
[  109.092595] PGD 80000001dc02d067 P4D 80000001dc02d067 PUD 1da9ef067 PMD 0
[  109.095384] Oops: 0000 [#1] SMP KASAN PTI
[  109.097834] CPU: 0 PID: 663 Comm: uclose Tainted: G    B 4.16.0-rc1-00062-g2975d5de6428 #45
[  109.100816] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 04/01/2014
[  109.105943] RIP: 0010:ucma_connect+0x138/0x1d0
[  109.108850] RSP: 0018:ffff8801c8567a80 EFLAGS: 00010246
[  109.111484] RAX: 0000000000000000 RBX: 1ffff100390acf50 RCX: ffffffff9d7812e2
[  109.114496] RDX: 1ffffffff3f507a5 RSI: 0000000000000297 RDI: 0000000000000297
[  109.117490] RBP: ffff8801daa15600 R08: 0000000000000000 R09: ffffed00390aceeb
[  109.120429] R10: 0000000000000001 R11: ffffed00390aceea R12: 0000000000000000
[  109.123318] R13: 0000000000000120 R14: ffff8801de6459c0 R15: 0000000000000118
[  109.126221] FS:  00007fabb68d6700(0000) GS:ffff8801e5c00000(0000) knlGS:0000000000000000
[  109.129468] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  109.132523] CR2: 0000000000000020 CR3: 00000001d45d8003 CR4: 00000000003606b0
[  109.135573] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  109.138716] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  109.142057] Call Trace:
[  109.144160]  ? ucma_listen+0x110/0x110
[  109.146386]  ? wake_up_q+0x59/0x90
[  109.148853]  ? futex_wake+0x10b/0x2a0
[  109.151297]  ? save_stack+0x89/0xb0
[  109.153489]  ? _copy_from_user+0x5e/0x90
[  109.155500]  ucma_write+0x174/0x1f0
[  109.157933]  ? ucma_resolve_route+0xf0/0xf0
[  109.160389]  ? __mod_node_page_state+0x1d/0x80
[  109.162706]  __vfs_write+0xc4/0x350
[  109.164911]  ? kernel_read+0xa0/0xa0
[  109.167121]  ? path_openat+0x1b10/0x1b10
[  109.169355]  ? fsnotify+0x899/0x8f0
[  109.171567]  ? fsnotify_unmount_inodes+0x170/0x170
[  109.174145]  ? __fget+0xa8/0xf0
[  109.177110]  vfs_write+0xf7/0x280
[  109.179532]  SyS_write+0xa1/0x120
[  109.181885]  ? SyS_read+0x120/0x120
[  109.184482]  ? compat_start_thread+0x60/0x60
[  109.187124]  ? SyS_read+0x120/0x120
[  109.189548]  do_syscall_64+0xeb/0x250
[  109.192178]  entry_SYSCALL_64_after_hwframe+0x21/0x86
[  109.194725] RIP: 0033:0x7fabb61ebe99
[  109.197040] RSP: 002b:00007fabb68d5e98 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[  109.200294] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fabb61ebe99
[  109.203399] RDX: 0000000000000120 RSI: 00000000200001c0 RDI: 0000000000000004
[  109.206548] RBP: 00007fabb68d5ec0 R08: 0000000000000000 R09: 0000000000000000
[  109.209902] R10: 0000000000000000 R11: 0000000000000202 R12: 00007fabb68d5fc0
[  109.213327] R13: 0000000000000000 R14: 00007fff40ab2430 R15: 00007fabb68d69c0
[  109.216613] Code: 88 44 24 2c 0f b6 84 24 6e 01 00 00 88 44 24 2d 0f
b6 84 24 69 01 00 00 88 44 24 2e 8b 44 24 60 89 44 24 30 e8 da f6 06 ff
31 c0 <66> 41 83 7c 24 20 1b 75 04 8b 44 24 64 48 8d 74 24 20 4c 89 e7
[  109.223602] RIP: ucma_connect+0x138/0x1d0 RSP: ffff8801c8567a80
[  109.226256] CR2: 0000000000000020

Fixes: 75216638572f ("RDMA/cma: Export rdma cm interface to userspace")
Reported-by: <>
Signed-off-by: Leon Romanovsky <>
Signed-off-by: Jason Gunthorpe <>
4 years agoMerge branch 'for-4.16-fixes' of git://
Linus Torvalds [Mon, 19 Mar 2018 22:39:02 +0000 (15:39 -0700)]
Merge branch 'for-4.16-fixes' of git://git./linux/kernel/git/tj/cgroup

Pull cgroup fixes from Tejun Heo:
 "Two commits to fix the following subtle cgroup2 behavior bugs:

   - cpu.max was rejecting config when it shouldn't

   - thread mode enable was allowed when it shouldn't"

* 'for-4.16-fixes' of git://
  cgroup: fix rule checking for threaded mode switching
  sched, cgroup: Don't reject lower cpu.max on ancestors

4 years agoMerge branch 'for-4.16-fixes' of git://
Linus Torvalds [Mon, 19 Mar 2018 22:13:04 +0000 (15:13 -0700)]
Merge branch 'for-4.16-fixes' of git://git./linux/kernel/git/tj/wq

Pull workqueue fixes from Tejun Heo:
 "Two low-impact workqueue commits.

  One fixes workqueue creation error path and the other removes the
  unused cancel_work()"

* 'for-4.16-fixes' of git://
  workqueue: remove unused cancel_work()
  workqueue: use put_device() instead of kfree()

4 years agoMerge branch 'for-4.16-fixes' of git://
Linus Torvalds [Mon, 19 Mar 2018 21:48:35 +0000 (14:48 -0700)]
Merge branch 'for-4.16-fixes' of git://git./linux/kernel/git/tj/percpu

Pull percpu fixes from Tejun Heo:
 "Late percpu pull request for v4.16-rc6.

   - percpu allocator pool replenishing no longer triggers OOM or
     warning messages.

     Also, the alloc interface now understands __GFP_NORETRY and
     __GFP_NOWARN. This is to allow avoiding OOMs from userland
     triggered actions like bpf map creation.

     Also added cond_resched() in alloc loop.

   - perpcu allocation now can be interrupted by kill sigs to avoid
     deadlocking OOM killer.

   - Added Dennis Zhou as a co-maintainer.

     He has rewritten the area map allocator, understands most of the
     code base and has been responsive for all bug reports"

* 'for-4.16-fixes' of git://
  percpu_ref: Update doc to dissuade users from depending on internal RCU grace periods
  mm: Allow to kill tasks doing pcpu_alloc() and waiting for pcpu_balance_workfn()
  percpu: include linux/sched.h for cond_resched()
  percpu: add a schedule point in pcpu_balance_workfn()
  percpu: allow select gfp to be passed to underlying allocators
  percpu: add __GFP_NORETRY semantics to the percpu balancing path
  percpu: match chunk allocator declarations with definitions
  percpu: add Dennis Zhou as a percpu co-maintainer

4 years agoMerge branch 'for-4.16-fixes' of git://
Linus Torvalds [Mon, 19 Mar 2018 21:23:30 +0000 (14:23 -0700)]
Merge branch 'for-4.16-fixes' of git://git./linux/kernel/git/tj/libata

Pull libata fixes from Tejun Heo:
 "I sat on them too long and it's quite a few this late, but nothing has
  a wide blast area. The changes are...

   - Fix corner cases in SG command handling.

   - Recent introduction of default powersaving mode config option
     exposed several devices with broken powersaving behaviors. A number
     of patches to update the blacklist accordingly.

   - Fix a kernel panic on SAS hotplug.

   - Other misc and device specific updates"

* 'for-4.16-fixes' of git://
  libata: Modify quirks for MX100 to limit NCQ_TRIM quirk to MU01 version
  libata: Make Crucial BX100 500GB LPM quirk apply to all firmware versions
  libata: Apply NOLPM quirk to Crucial M500 480 and 960GB SSDs
  libata: Enable queued TRIM for Samsung SSD 860
  PCI: Add function 1 DMA alias quirk for Highpoint RocketRAID 644L
  ahci: Add PCI-id for the Highpoint Rocketraid 644L card
  ata: do not schedule hot plug if it is a sas host
  libata: disable LPM for Crucial BX100 SSD 500GB drive
  libata: Apply NOLPM quirk to Crucial MX100 512GB SSDs
  libata: update documentation for sysfs interfaces
  ata: sata_rcar: Remove unused variable in sata_rcar_init_controller()
  libata: transport: cleanup documentation of sysfs interface
  sata_rcar: Reset SATA PHY when Salvator-X board resumes
  libata: don't try to pass through NCQ commands to non-NCQ devices
  libata: remove WARN() for DMA or PIO command without data
  libata: fix length validation of ATAPI-relayed SCSI commands
  ata: libahci: fix comment indentation
  ahci: Add check for device presence (PCIe hot unplug) in ahci_stop_engine()
  libata: Fix compile warning with ATA_DEBUG enabled

4 years agonfsd: remove blocked locks on client teardown
Jeff Layton [Fri, 16 Mar 2018 15:32:02 +0000 (11:32 -0400)]
nfsd: remove blocked locks on client teardown

We had some reports of panics in nfsd4_lm_notify, and that showed a
nfs4_lockowner that had outlived its so_client.

Ensure that we walk any leftover lockowners after tearing down all of
the stateids, and remove any blocked locks that they hold.

With this change, we also don't need to walk the nbl_lru on nfsd_net
shutdown, as that will happen naturally when we tear down the clients.

Fixes: 76d348fadff5 (nfsd: have nfsd4_lock use blocking locks for v4.1+ locks)
Reported-by: Frank Sorenson <>
Signed-off-by: Jeff Layton <>
Cc: # 4.9
Signed-off-by: J. Bruce Fields <>
4 years agoRDMA/verbs: Remove restrack entry from XRCD structure
Leon Romanovsky [Mon, 19 Mar 2018 10:21:43 +0000 (12:21 +0200)]
RDMA/verbs: Remove restrack entry from XRCD structure

XRCD object is not implemented in the restrack, so lets remove it.

Fixes: 02d8883f520e ("RDMA/restrack: Add general infrastructure to track RDMA resources")
Signed-off-by: Leon Romanovsky <>
Signed-off-by: Jason Gunthorpe <>
4 years agoRDMA/ucma: Fix use-after-free access in ucma_close
Leon Romanovsky [Mon, 19 Mar 2018 12:20:15 +0000 (14:20 +0200)]
RDMA/ucma: Fix use-after-free access in ucma_close

The error in ucma_create_id() left ctx in the list of contexts belong
to ucma file descriptor. The attempt to close this file descriptor causes
to use-after-free accesses while iterating over such list.

Fixes: 75216638572f ("RDMA/cma: Export rdma cm interface to userspace")
Reported-by: <>
Signed-off-by: Leon Romanovsky <>
Reviewed-by: Sean Hefty <>
Signed-off-by: Jason Gunthorpe <>
4 years agopercpu_ref: Update doc to dissuade users from depending on internal RCU grace periods
Tejun Heo [Wed, 14 Mar 2018 19:45:12 +0000 (12:45 -0700)]
percpu_ref: Update doc to dissuade users from depending on internal RCU grace periods

percpu_ref internally uses sched-RCU to implement the percpu -> atomic
mode switching and the documentation suggested that this could be
depended upon.  This doesn't seem like a good idea.

* percpu_ref uses sched-RCU which has different grace periods regular
  RCU.  Users may combine percpu_ref with regular RCU usage and
  incorrectly believe that regular RCU grace periods are performed by
  percpu_ref.  This can lead to, for example, use-after-free due to
  premature freeing.

* percpu_ref has a grace period when switching from percpu to atomic
  mode.  It doesn't have one between the last put and release.  This
  distinction is subtle and can lead to surprising bugs.

* percpu_ref allows starting in and switching to atomic mode manually
  for debugging and other purposes.  This means that there may not be
  any grace periods from kill to release.

This patch makes it clear that the grace periods are percpu_ref's
internal implementation detail and can't be depended upon by the

Signed-off-by: Tejun Heo <>
Cc: Kent Overstreet <>
Cc: Linus Torvalds <>
Signed-off-by: Tejun Heo <>
4 years agomm: Allow to kill tasks doing pcpu_alloc() and waiting for pcpu_balance_workfn()
Kirill Tkhai [Mon, 19 Mar 2018 15:32:10 +0000 (18:32 +0300)]
mm: Allow to kill tasks doing pcpu_alloc() and waiting for pcpu_balance_workfn()

In case of memory deficit and low percpu memory pages,
pcpu_balance_workfn() takes pcpu_alloc_mutex for a long
time (as it makes memory allocations itself and waits
for memory reclaim). If tasks doing pcpu_alloc() are
choosen by OOM killer, they can't exit, because they
are waiting for the mutex.

The patch makes pcpu_alloc() to care about killing signal
and use mutex_lock_killable(), when it's allowed by GFP
flags. This guarantees, a task does not miss SIGKILL
from OOM killer.

Signed-off-by: Kirill Tkhai <>
Signed-off-by: Tejun Heo <>
4 years agopercpu: include linux/sched.h for cond_resched()
Tejun Heo [Wed, 14 Mar 2018 15:27:26 +0000 (08:27 -0700)]
percpu: include linux/sched.h for cond_resched()

microblaze build broke due to missing declaration of the
cond_resched() invocation added recently.  Let's include linux/sched.h

Signed-off-by: Tejun Heo <>
Reported-by: kbuild test robot <>
4 years agoclk: bcm2835: Protect sections updating shared registers
Boris Brezillon [Thu, 8 Feb 2018 13:43:36 +0000 (14:43 +0100)]
clk: bcm2835: Protect sections updating shared registers

CM_PLLx and A2W_XOSC_CTRL registers are accessed by different clock
handlers and must be accessed with ->regs_lock held.
Update the sections where this protection is missing.

Fixes: 41691b8862e2 ("clk: bcm2835: Add support for programming the audio domain clocks")
Cc: <>
Signed-off-by: Boris Brezillon <>
Reviewed-by: Eric Anholt <>
Signed-off-by: Stephen Boyd <>
4 years agoclk: bcm2835: Fix ana->maskX definitions
Boris Brezillon [Thu, 8 Feb 2018 13:43:35 +0000 (14:43 +0100)]
clk: bcm2835: Fix ana->maskX definitions

ana->maskX values are already '~'-ed in bcm2835_pll_set_rate(). Remove
the '~' in the definition to fix ANA setup.

Note that this commit fixes a long standing bug preventing one from
using an HDMI display if it's plugged after the FW has booted Linux.
This is because PLLH is used by the HDMI encoder to generate the pixel

Fixes: 41691b8862e2 ("clk: bcm2835: Add support for programming the audio domain clocks")
Cc: <>
Signed-off-by: Boris Brezillon <>
Reviewed-by: Eric Anholt <>
Signed-off-by: Stephen Boyd <>
4 years agolibata: Modify quirks for MX100 to limit NCQ_TRIM quirk to MU01 version
Hans de Goede [Mon, 19 Mar 2018 15:34:00 +0000 (16:34 +0100)]
libata: Modify quirks for MX100 to limit NCQ_TRIM quirk to MU01 version

When commit 9c7be59fc519af ("libata: Apply NOLPM quirk to Crucial MX100
512GB SSDs") was added it inherited the ATA_HORKAGE_NO_NCQ_TRIM quirk
from the existing "Crucial_CT*MX100*" entry, but that entry sets model_rev
to "MU01", where as the entry adding the NOLPM quirk sets it to NULL.

This means that after this commit we no apply the NO_NCQ_TRIM quirk to
all "Crucial_CT512MX100*" SSDs even if they have the fixed "MU02"
firmware. This commit splits the "Crucial_CT512MX100*" quirk into 2
quirks, one for the "MU01" firmware and one for all other firmware
versions, so that we once again only apply the NO_NCQ_TRIM quirk to the
"MU01" firmware version.

Fixes: 9c7be59fc519af ("libata: Apply NOLPM quirk to ... MX100 512GB SSDs")
Signed-off-by: Hans de Goede <>
Signed-off-by: Tejun Heo <>
4 years agolibata: Make Crucial BX100 500GB LPM quirk apply to all firmware versions
Hans de Goede [Mon, 19 Mar 2018 15:33:59 +0000 (16:33 +0100)]
libata: Make Crucial BX100 500GB LPM quirk apply to all firmware versions

Commit b17e5729a630 ("libata: disable LPM for Crucial BX100 SSD 500GB
drive"), introduced a ATA_HORKAGE_NOLPM quirk for Crucial BX100 500GB SSDs
but limited this to the MU02 firmware version, according to:

MU02 is the last version, so there are no newer possibly fixed versions
and if the MU02 version has broken LPM then the MU01 almost certainly
also has broken LPM, so this commit changes the quirk to apply to all
firmware versions.

Fixes: b17e5729a630 ("libata: disable LPM for Crucial BX100 SSD 500GB...")
Cc: Kai-Heng Feng <>
Signed-off-by: Hans de Goede <>
Signed-off-by: Tejun Heo <>
4 years agolibata: Apply NOLPM quirk to Crucial M500 480 and 960GB SSDs
Hans de Goede [Mon, 19 Mar 2018 15:33:58 +0000 (16:33 +0100)]
libata: Apply NOLPM quirk to Crucial M500 480 and 960GB SSDs

There have been reports of the Crucial M500 480GB model not working
with LPM set to min_power / med_power_with_dipm level.

It has not been tested with medium_power, but that typically has no
measurable power-savings.

Note the reporters Crucial_CT480M500SSD3 has a firmware version of MU03
and there is a MU05 update available, but that update does not mention any
LPM fixes in its changelog, so the quirk matches all firmware versions.

In my experience the LPM problems with (older) Crucial SSDs seem to be
limited to higher capacity versions of the SSDs (different firmware?),
so this commit adds a NOLPM quirk for the 480 and 960GB versions of the
M500, to avoid LPM causing issues with these SSDs.

Reported-and-tested-by: Martin Steigerwald <>
Signed-off-by: Hans de Goede <>
Signed-off-by: Tejun Heo <>
4 years agoLinux 4.16-rc6 v4.16-rc6
Linus Torvalds [Mon, 19 Mar 2018 00:48:42 +0000 (17:48 -0700)]
Linux 4.16-rc6

4 years agoMerge branch 'x86-pti-for-linus' of git://
Linus Torvalds [Sun, 18 Mar 2018 19:03:15 +0000 (12:03 -0700)]
Merge branch 'x86-pti-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86/pti updates from Thomas Gleixner:
 "Another set of melted spectrum updates:

   - Iron out the last late microcode loading issues by actually
     checking whether new microcode is present and preventing the CPU
     synchronization to run into a timeout induced hang.

   - Remove Skylake C2 from the microcode blacklist according to the
     latest Intel documentation

   - Fix the VM86 POPF emulation which traps if VIP is set, but VIF is
     not. Enhance the selftests to catch that kind of issue

   - Annotate indirect calls/jumps for objtool on 32bit. This is not a
     functional issue, but for consistency sake its the right thing to

   - Fix a jump label build warning observed on SPARC64 which uses 32bit
     storage for the code location which is casted to 64 bit pointer w/o
     extending it to 64bit first.

   - Add two new cpufeature bits. Not really an urgent issue, but
     provides them for both x86 and x86/kvm work. No impact on the
     current kernel"

* 'x86-pti-for-linus' of git://
  x86/microcode: Fix CPU synchronization routine
  x86/microcode: Attempt late loading only when new microcode is present
  x86/speculation: Remove Skylake C2 from Speculation Control microcode blacklist
  jump_label: Fix sparc64 warning
  x86/speculation, objtool: Annotate indirect calls/jumps for objtool on 32-bit kernels
  x86/vm86/32: Fix POPF emulation
  selftests/x86/entry_from_vm86: Add test cases for POPF
  selftests/x86/entry_from_vm86: Exit with 1 if we fail
  x86/cpufeatures: Add Intel PCONFIG cpufeature
  x86/cpufeatures: Add Intel Total Memory Encryption cpufeature

4 years agoMerge branch 'x86-urgent-for-linus' of git://
Linus Torvalds [Sun, 18 Mar 2018 19:01:14 +0000 (12:01 -0700)]
Merge branch 'x86-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86 fix from Thomas Gleixner:
 "A single fix for vmalloc_fault() which uses p*d_huge() unconditionally
  whether CONFIG_HUGETLBFS is set or not. In case of CONFIG_HUGETLBFS=n
  this results in a crash as p*d_huge() returns 0 in that case"

* 'x86-urgent-for-linus' of git://
  x86/mm: Fix vmalloc_fault to use pXd_large

4 years agoMerge branch 'irq-urgent-for-linus' of git://
Linus Torvalds [Sun, 18 Mar 2018 18:59:14 +0000 (11:59 -0700)]
Merge branch 'irq-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull irq fixes from Thomas Gleixner:
 "Three fixes for irq chip drivers:

   - Make sure the allocations in the GIC-V3 ITS driver are large enough
     to accomodate the interrupt space

   - Fix a misplaced __iomem annotation which causes a splat of 26
     sparse warnings

   - Remove an unused function in the IMX GPCV2 driver which causes
     build warnings"

* 'irq-urgent-for-linus' of git://
  irqchip/irq-imx-gpcv2: Remove unused function
  irqchip/gic-v3-its: Ensure nr_ites >= nr_lpis
  irqchip/gic-v3-its: Fix misplaced __iomem annotations

4 years agoMerge branch 'efi-urgent-for-linus' of git://
Linus Torvalds [Sun, 18 Mar 2018 18:56:53 +0000 (11:56 -0700)]
Merge branch 'efi-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull EFI fix from Thomas Gleixner:
 "A single fix to prevent partially initialized pointers in mixed mode
  (64bit kernel on 32bit UEFI)"

* 'efi-urgent-for-linus' of git://
  efi/libstub/tpm: Initialize pointer variables to zero for mixed mode

4 years agoMerge tag 'for-linus' of git://
Linus Torvalds [Sun, 18 Mar 2018 18:23:12 +0000 (11:23 -0700)]
Merge tag 'for-linus' of git://git./virt/kvm/kvm

Pull KVM fixes from Paolo Bonzini:
   - fix bug leading to lost IPIs and smp_call_function_many() lockups
     on POWER9

   - locking fix
   - reset fix
   - GICv2 multi-source SGI injection fix
   - GICv2-on-v3 MMIO synchronization fix
   - make the console less verbose.

   - fix device passthrough on AMD SME"

* tag 'for-linus' of git://
  KVM: x86: Fix device passthrough when SME is active
  kvm: arm/arm64: vgic-v3: Tighten synchronization for guests using v2 on v3
  KVM: arm/arm64: vgic: Don't populate multiple LRs with the same vintid
  KVM: arm/arm64: Reduce verbosity of KVM init log
  KVM: arm/arm64: Reset mapped IRQs on VM reset
  KVM: arm/arm64: Avoid vcpu_load for other vcpu ioctls than KVM_RUN
  KVM: arm/arm64: vgic: Add missing irq_lock to vgic_mmio_read_pending
  KVM: PPC: Book3S HV: Fix trap number return from __kvmppc_vcore_entry

4 years agoparisc: Handle case where flush_cache_range is called with no context
John David Anglin [Wed, 7 Mar 2018 13:18:05 +0000 (08:18 -0500)]
parisc: Handle case where flush_cache_range is called with no context

Just when I had decided that flush_cache_range() was always called with
a valid context, Helge reported two cases where the
"BUG_ON(!vma->vm_mm->context);" was hit on the phantom buildd:

 kernel BUG at /mnt/sdb6/linux/linux-4.15.4/arch/parisc/kernel/cache.c:587!
 CPU: 1 PID: 3254 Comm: kworker/1:2 Tainted: G D 4.15.0-1-parisc64-smp #1 Debian 4.15.4-1+b1
 Workqueue: events free_ioctx
  IAOQ[0]: flush_cache_range+0x164/0x168
  IAOQ[1]: flush_cache_page+0x0/0x1c8
  RP(r2): unmap_page_range+0xae8/0xb88
  [<00000000404a6980>] unmap_page_range+0xae8/0xb88
  [<00000000404a6ae0>] unmap_single_vma+0xc0/0x188
  [<00000000404a6cdc>] zap_page_range_single+0x134/0x1f8
  [<00000000404a702c>] unmap_mapping_range+0x1cc/0x208
  [<0000000040461518>] truncate_pagecache+0x98/0x108
  [<0000000040461624>] truncate_setsize+0x9c/0xb8
  [<00000000405d7f30>] put_aio_ring_file+0x80/0x100
  [<00000000405d803c>] aio_free_ring+0x8c/0x290
  [<00000000405d82c0>] free_ioctx+0x80/0x180
  [<0000000040284e6c>] process_one_work+0x21c/0x668
  [<00000000402854c4>] worker_thread+0x20c/0x778
  [<0000000040291d44>] kthread+0x2d4/0x2e0
  [<0000000040204020>] end_fault_vector+0x20/0xc0

This indicates that we need to handle the no context case in
flush_cache_range() as we do in flush_cache_mm().

In thinking about this, I realized that we don't need to flush the TLB
when there is no context.  So, I added context checks to the large flush
cases in flush_cache_mm() and flush_cache_range().  The large flush case
occurs frequently in flush_cache_mm() and the change should improve fork

The v2 version of this change removes the BUG_ON from flush_cache_page()
by skipping the TLB flush when there is no context.  I also added code
to flush the TLB in flush_cache_mm() and flush_cache_range() when we
have a context that's not current.  Now all three routines handle TLB
flushes in a similar manner.

Signed-off-by: John David Anglin <>
Cc: # 4.9+
Signed-off-by: Helge Deller <>
4 years agoMerge tag 'for-4.16-rc5-tag' of git://
Linus Torvalds [Fri, 16 Mar 2018 20:37:42 +0000 (13:37 -0700)]
Merge tag 'for-4.16-rc5-tag' of git://git./linux/kernel/git/kdave/linux

Pull btrfs fixes from David Sterba:
 "There's an important revert in this pull request that needs to go to
  stable as it causes a corruption on big endian machines.

  The other fix is for FIEMAP incorrectly reporting shared extents
  before a sync and one fix for a crash in raid56.

  So far we got only one report about the BE corruption, the stable
  kernels were out for like a week, so hopefully the scope of the damage
  is low"

* tag 'for-4.16-rc5-tag' of git://
  Revert "btrfs: use proper endianness accessors for super_copy"
  btrfs: add missing initialization in btrfs_check_shared
  btrfs: Fix NULL pointer exception in find_bio_stripe

4 years agoMerge tag 'microblaze-4.16-rc6' of git://
Linus Torvalds [Fri, 16 Mar 2018 20:27:34 +0000 (13:27 -0700)]
Merge tag 'microblaze-4.16-rc6' of git://

Pull microblaze fixes from Michal Simek:

 - Use NO_BOOTMEM to fix boot issue

 - Fix opt lib endian dependencies

* tag 'microblaze-4.16-rc6' of git://
  microblaze: switch to NO_BOOTMEM
  microblaze: remove unused alloc_maybe_bootmem
  microblaze: Setup dependencies for ASM optimized lib functions

4 years agox86/microcode: Fix CPU synchronization routine
Borislav Petkov [Wed, 14 Mar 2018 18:36:15 +0000 (19:36 +0100)]
x86/microcode: Fix CPU synchronization routine

Emanuel reported an issue with a hang during microcode update because my
dumb idea to use one atomic synchronization variable for both rendezvous
- before and after update - was simply bollocks:

  microcode: microcode_reload_late: late_cpus: 4
  microcode: __reload_late: cpu 2 entered
  microcode: __reload_late: cpu 1 entered
  microcode: __reload_late: cpu 3 entered
  microcode: __reload_late: cpu 0 entered
  microcode: __reload_late: cpu 1 left
  microcode: Timeout while waiting for CPUs rendezvous, remaining: 1

CPU1 above would finish, leave and the others will still spin waiting for
it to join.

So do two synchronization atomics instead, which makes the code a lot more

Also, since the update is serialized and it also takes quite some time per
microcode engine, increase the exit timeout by the number of CPUs on the

That's ok because the moment all CPUs are done, that timeout will be cut

Furthermore, panic when some of the CPUs timeout when returning from a
microcode update: we can't allow a system with not all cores updated.

Also, as an optimization, do not do the exit sync if microcode wasn't

Reported-by: Emanuel Czirai <>
Signed-off-by: Borislav Petkov <>
Signed-off-by: Thomas Gleixner <>
Tested-by: Emanuel Czirai <>
Tested-by: Ashok Raj <>
Tested-by: Tom Lendacky <>
4 years agox86/microcode: Attempt late loading only when new microcode is present
Borislav Petkov [Wed, 14 Mar 2018 18:36:14 +0000 (19:36 +0100)]
x86/microcode: Attempt late loading only when new microcode is present

Return UCODE_NEW from the scanning functions to denote that new microcode
was found and only then attempt the expensive synchronization dance.

Reported-by: Emanuel Czirai <>
Signed-off-by: Borislav Petkov <>
Signed-off-by: Thomas Gleixner <>
Tested-by: Emanuel Czirai <>
Tested-by: Ashok Raj <>
Tested-by: Tom Lendacky <>
4 years agoMerge tag 'drm-fixes-for-v4.16-rc6' of git://
Linus Torvalds [Fri, 16 Mar 2018 19:55:00 +0000 (12:55 -0700)]
Merge tag 'drm-fixes-for-v4.16-rc6' of git://

Pull drm fixes from Dave Airlie:
 "i915, amd and nouveau fixes.

   - backlight fix for some panels
   - pm fix
   - fencing fix
   - some GVT fixes

   - backlight fix across suspend/resume
   - object destruction ordering issue fix
   - displayport fix

   - two backlight fixes
   - fix for some lockups

  Pretty quiet week, seems like everyone was fixing backlights"

* tag 'drm-fixes-for-v4.16-rc6' of git://
  drm/nouveau/bl: fix backlight regression
  drm/nouveau/bl: Fix oops on driver unbind
  drm/nouveau/mmu: ALIGN_DOWN correct variable
  drm/i915/gvt: fix user copy warning by whitelist workload rb_tail field
  drm/i915/gvt: Correct the privilege shadow batch buffer address
  drm/amdgpu/dce: Don't turn off DP sink when disconnected
  drm/amdgpu: save/restore backlight level in legacy dce code
  drm/radeon: fix prime teardown order
  drm/amdgpu: fix prime teardown order
  drm/i915: Kick the rps worker when changing the boost frequency
  drm/i915: Only prune fences after wait-for-all
  drm/i915: Enable VBT based BL control for DP
  drm/i915/gvt: keep oa config in shadow ctx
  drm/i915/gvt: Add runtime_pm_get/put into gvt_switch_mmio

4 years agoRevert "btrfs: use proper endianness accessors for super_copy"
David Sterba [Fri, 16 Mar 2018 13:31:43 +0000 (14:31 +0100)]
Revert "btrfs: use proper endianness accessors for super_copy"

This reverts commit 3c181c12c431fe33b669410d663beb9cceefcd1b.

The offending patch was merged in 4.16-rc4 and was promptly applied to
stable kernels 4.14.25 and 4.15.8.

The patch causes a corruption in several superblock items on big-endian
machines because of messed up endianity conversions. The damage is
manually repairable. A filesystem cannot be mounted again after it has
been unmounted once.

We do a full revert and not a fixup so stable can pick that patch ASAP.

Fixes: 3c181c12c431 ("btrfs: use proper endianness accessors for super_copy")
CC: # 4.14+
Reported-by: Christoph Biedl <>
Signed-off-by: David Sterba <>
4 years agoKVM: x86: Fix device passthrough when SME is active
Tom Lendacky [Thu, 8 Mar 2018 23:17:31 +0000 (17:17 -0600)]
KVM: x86: Fix device passthrough when SME is active

When using device passthrough with SME active, the MMIO range that is
mapped for the device should not be mapped encrypted.  Add a check in
set_spte() to insure that a page is not mapped encrypted if that page
is a device MMIO page as indicated by kvm_is_mmio_pfn().

Cc: <> # 4.14.x-
Signed-off-by: Tom Lendacky <>
Signed-off-by: Paolo Bonzini <>
4 years agomicroblaze: switch to NO_BOOTMEM
Rob Herring [Fri, 9 Mar 2018 15:54:07 +0000 (09:54 -0600)]
microblaze: switch to NO_BOOTMEM

Microblaze doesn't set CONFIG_NO_BOOTMEM and so memblock_virt_alloc()

Similar change was already done by others architectures
"ARM: mm: Remove bootmem code and switch to NO_BOOTMEM"
(sha1: 84f452b1e8fc73ac0e31254c66e3e2260ce5263d)
"openrisc: Consolidate setup to use memblock instead of bootmem"
(sha1: 266c7fad157265bb54d17db1c9545f2aaa488643)
"parisc: Drop bootmem and switch to memblock"
(sha1: 4fe9e1d957e45ad8eba9885ee860a0e93d13a7c7)
"powerpc: Remove bootmem allocator"
(sha1: 10239733ee8617bac3f1c1769af43a88ed979324)
"s390/mm: Convert bootmem to memblock"
(sha1: 50be634507284eea38df78154d22615d21200b42)
"sparc64: Convert over to NO_BOOTMEM."
(sha1: 625d693e9784f988371e69c2b41a2172c0be6c11)
"xtensa: drop sysmem and switch to memblock"
(sha1: 0e46c1115f5816949220d62dd3ff04aa68e7ac6b)

Issue was introduced by:
"of/fdt: use memblock_virt_alloc for early alloc"
(sha1: 0fa1c579349fdd90173381712ad78aa99c09d38b)

Signed-off-by: Rob Herring <>
Tested-by: Alvaro Gamez Machado <>
Tested-by: Michal Simek <>
Signed-off-by: Michal Simek <>
4 years agomicroblaze: remove unused alloc_maybe_bootmem
Rob Herring [Fri, 9 Mar 2018 15:52:55 +0000 (09:52 -0600)]
microblaze: remove unused alloc_maybe_bootmem

alloc_maybe_bootmem is unused, so remove it.

Signed-off-by: Rob Herring <>
Signed-off-by: Michal Simek <>
4 years agomicroblaze: Setup dependencies for ASM optimized lib functions
Michal Simek [Thu, 22 Feb 2018 14:19:37 +0000 (15:19 +0100)]
microblaze: Setup dependencies for ASM optimized lib functions

The patch:
"microblaze: Setup proper dependency for optimized lib functions"
(sha1: 7b6ce52be3f86520524711a6f33f3866f9339694)
didn't setup all dependencies properly.
Optimized lib functions in C are also present for little endian
and optimized library functions in assembler are implemented only for
big endian version.

Reported-by: kbuild test robot <>
Signed-off-by: Michal Simek <>
4 years agox86/speculation: Remove Skylake C2 from Speculation Control microcode blacklist
Alexander Sergeyev [Tue, 13 Mar 2018 19:38:56 +0000 (22:38 +0300)]
x86/speculation: Remove Skylake C2 from Speculation Control microcode blacklist

In accordance with Intel's microcode revision guidance from March 6 MCU
rev 0xc2 is cleared on both Skylake H/S and Skylake Xeon E3 processors
that share CPUID 506E3.

Signed-off-by: Alexander Sergeyev <>
Signed-off-by: Thomas Gleixner <>
Cc: Jia Zhang <>
Cc: Greg Kroah-Hartman <>
Cc: Kyle Huey <>
Cc: David Woodhouse <>
4 years agoMerge tag 'drm-intel-fixes-2018-03-15' of git://
Dave Airlie [Fri, 16 Mar 2018 02:51:35 +0000 (12:51 +1000)]
Merge tag 'drm-intel-fixes-2018-03-15' of git:// into drm-fixes

Only GVT fixes:
- Two warnings fix for runtime pm and usr copy (Xiong, Zhenyu)
- OA context fix for vGPU profiling (Min)
- privilege batch buffer reloc fix (Fred)

* tag 'drm-intel-fixes-2018-03-15' of git://
  drm/i915/gvt: fix user copy warning by whitelist workload rb_tail field
  drm/i915/gvt: Correct the privilege shadow batch buffer address
  drm/i915/gvt: keep oa config in shadow ctx
  drm/i915/gvt: Add runtime_pm_get/put into gvt_switch_mmio

4 years agoRDMA/ucma: Check AF family prior resolving address
Leon Romanovsky [Thu, 15 Mar 2018 13:33:02 +0000 (15:33 +0200)]
RDMA/ucma: Check AF family prior resolving address

Garbage supplied by user will cause to UCMA module provide zero
memory size for memcpy(), because it wasn't checked, it will
produce unpredictable results in rdma_resolve_addr().

[   42.873814] BUG: KASAN: null-ptr-deref in rdma_resolve_addr+0xc8/0xfb0
[   42.874816] Write of size 28 at addr 00000000000000a0 by task resaddr/1044
[   42.876765]
[   42.876960] CPU: 1 PID: 1044 Comm: resaddr Not tainted 4.16.0-rc1-00057-gaa56a5293d7e #34
[   42.877840] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 04/01/2014
[   42.879691] Call Trace:
[   42.880236]  dump_stack+0x5c/0x77
[   42.880664]  kasan_report+0x163/0x380
[   42.881354]  ? rdma_resolve_addr+0xc8/0xfb0
[   42.881864]  memcpy+0x34/0x50
[   42.882692]  rdma_resolve_addr+0xc8/0xfb0
[   42.883366]  ? deref_stack_reg+0x88/0xd0
[   42.883856]  ? vsnprintf+0x31a/0x770
[   42.884686]  ? rdma_bind_addr+0xc40/0xc40
[   42.885327]  ? num_to_str+0x130/0x130
[   42.885773]  ? deref_stack_reg+0x88/0xd0
[   42.886217]  ? __read_once_size_nocheck.constprop.6+0x10/0x10
[   42.887698]  ? unwind_get_return_address_ptr+0x50/0x50
[   42.888302]  ? replace_slot+0x147/0x170
[   42.889176]  ? delete_node+0x12c/0x340
[   42.890223]  ? __radix_tree_lookup+0xa9/0x160
[   42.891196]  ? ucma_resolve_ip+0xb7/0x110
[   42.891917]  ucma_resolve_ip+0xb7/0x110
[   42.893003]  ? ucma_resolve_addr+0x190/0x190
[   42.893531]  ? _copy_from_user+0x5e/0x90
[   42.894204]  ucma_write+0x174/0x1f0
[   42.895162]  ? ucma_resolve_route+0xf0/0xf0
[   42.896309]  ? dequeue_task_fair+0x67e/0xd90
[   42.897192]  ? put_prev_entity+0x7d/0x170
[   42.897870]  ? ring_buffer_record_is_on+0xd/0x20
[   42.898439]  ? tracing_record_taskinfo_skip+0x20/0x50
[   42.899686]  __vfs_write+0xc4/0x350
[   42.900142]  ? kernel_read+0xa0/0xa0
[   42.900602]  ? firmware_map_remove+0xdf/0xdf
[   42.901135]  ? do_task_dead+0x5d/0x60
[   42.901598]  ? do_exit+0xcc6/0x1220
[   42.902789]  ? __fget+0xa8/0xf0
[   42.903190]  vfs_write+0xf7/0x280
[   42.903600]  SyS_write+0xa1/0x120
[   42.904206]  ? SyS_read+0x120/0x120
[   42.905710]  ? compat_start_thread+0x60/0x60
[   42.906423]  ? SyS_read+0x120/0x120
[   42.908716]  do_syscall_64+0xeb/0x250
[   42.910760]  entry_SYSCALL_64_after_hwframe+0x21/0x86
[   42.912735] RIP: 0033:0x7f138b0afe99
[   42.914734] RSP: 002b:00007f138b799e98 EFLAGS: 00000287 ORIG_RAX: 0000000000000001
[   42.917134] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f138b0afe99
[   42.919487] RDX: 000000000000002e RSI: 0000000020000c40 RDI: 0000000000000004
[   42.922393] RBP: 00007f138b799ec0 R08: 00007f138b79a700 R09: 0000000000000000
[   42.925266] R10: 00007f138b79a700 R11: 0000000000000287 R12: 00007f138b799fc0
[   42.927570] R13: 0000000000000000 R14: 00007ffdbae757c0 R15: 00007f138b79a9c0
[   42.930047]
[   42.932681] Disabling lock debugging due to kernel taint
[   42.934795] BUG: unable to handle kernel NULL pointer dereference at 00000000000000a0
[   42.936939] IP: memcpy_erms+0x6/0x10
[   42.938864] PGD 80000001bea92067 P4D 80000001bea92067 PUD 1bea96067 PMD 0
[   42.941576] Oops: 0002 [#1] SMP KASAN PTI
[   42.943952] CPU: 1 PID: 1044 Comm: resaddr Tainted: G    B 4.16.0-rc1-00057-gaa56a5293d7e #34
[   42.946964] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 04/01/2014
[   42.952336] RIP: 0010:memcpy_erms+0x6/0x10
[   42.954707] RSP: 0018:ffff8801c8b479c8 EFLAGS: 00010286
[   42.957227] RAX: 00000000000000a0 RBX: ffff8801c8b47ba0 RCX: 000000000000001c
[   42.960543] RDX: 000000000000001c RSI: ffff8801c8b47bbc RDI: 00000000000000a0
[   42.963867] RBP: ffff8801c8b47b60 R08: 0000000000000000 R09: ffffed0039168ed1
[   42.967303] R10: 0000000000000001 R11: ffffed0039168ed0 R12: ffff8801c8b47bbc
[   42.970685] R13: 00000000000000a0 R14: 1ffff10039168f4a R15: 0000000000000000
[   42.973631] FS:  00007f138b79a700(0000) GS:ffff8801e5d00000(0000) knlGS:0000000000000000
[   42.976831] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   42.979239] CR2: 00000000000000a0 CR3: 00000001be908002 CR4: 00000000003606a0
[   42.982060] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   42.984877] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   42.988033] Call Trace:
[   42.990487]  rdma_resolve_addr+0xc8/0xfb0
[   42.993202]  ? deref_stack_reg+0x88/0xd0
[   42.996055]  ? vsnprintf+0x31a/0x770
[   42.998707]  ? rdma_bind_addr+0xc40/0xc40
[   43.000985]  ? num_to_str+0x130/0x130
[   43.003410]  ? deref_stack_reg+0x88/0xd0
[   43.006302]  ? __read_once_size_nocheck.constprop.6+0x10/0x10
[   43.008780]  ? unwind_get_return_address_ptr+0x50/0x50
[   43.011178]  ? replace_slot+0x147/0x170
[   43.013517]  ? delete_node+0x12c/0x340
[   43.016019]  ? __radix_tree_lookup+0xa9/0x160
[   43.018755]  ? ucma_resolve_ip+0xb7/0x110
[   43.021270]  ucma_resolve_ip+0xb7/0x110
[   43.023968]  ? ucma_resolve_addr+0x190/0x190
[   43.026312]  ? _copy_from_user+0x5e/0x90
[   43.029384]  ucma_write+0x174/0x1f0
[   43.031861]  ? ucma_resolve_route+0xf0/0xf0
[   43.034782]  ? dequeue_task_fair+0x67e/0xd90
[   43.037483]  ? put_prev_entity+0x7d/0x170
[   43.040215]  ? ring_buffer_record_is_on+0xd/0x20
[   43.042990]  ? tracing_record_taskinfo_skip+0x20/0x50
[   43.045595]  __vfs_write+0xc4/0x350
[   43.048624]  ? kernel_read+0xa0/0xa0
[   43.051604]  ? firmware_map_remove+0xdf/0xdf
[   43.055379]  ? do_task_dead+0x5d/0x60
[   43.058000]  ? do_exit+0xcc6/0x1220
[   43.060783]  ? __fget+0xa8/0xf0
[   43.063133]  vfs_write+0xf7/0x280
[   43.065677]  SyS_write+0xa1/0x120
[   43.068647]  ? SyS_read+0x120/0x120
[   43.071179]  ? compat_start_thread+0x60/0x60
[   43.074025]  ? SyS_read+0x120/0x120
[   43.076705]  do_syscall_64+0xeb/0x250
[   43.079006]  entry_SYSCALL_64_after_hwframe+0x21/0x86
[   43.081606] RIP: 0033:0x7f138b0afe99
[   43.083679] RSP: 002b:00007f138b799e98 EFLAGS: 00000287 ORIG_RAX: 0000000000000001
[   43.086802] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f138b0afe99
[   43.089989] RDX: 000000000000002e RSI: 0000000020000c40 RDI: 0000000000000004
[   43.092866] RBP: 00007f138b799ec0 R08: 00007f138b79a700 R09: 0000000000000000
[   43.096233] R10: 00007f138b79a700 R11: 0000000000000287 R12: 00007f138b799fc0
[   43.098913] R13: 0000000000000000 R14: 00007ffdbae757c0 R15: 00007f138b79a9c0
[   43.101809] Code: 90 90 90 90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48
c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48
89 d1 <f3> a4 c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38
[   43.107950] RIP: memcpy_erms+0x6/0x10 RSP: ffff8801c8b479c8

Reported-by: <>
Fixes: 75216638572f ("RDMA/cma: Export rdma cm interface to userspace")
Signed-off-by: Leon Romanovsky <>
Reviewed-by: Sean Hefty <>
Signed-off-by: Jason Gunthorpe <>
4 years agoMerge branch 'linux-4.16' of git:// into drm-fixes
Dave Airlie [Fri, 16 Mar 2018 02:06:17 +0000 (12:06 +1000)]
Merge branch 'linux-4.16' of git:// into drm-fixes

nouveau regression fixes.

* 'linux-4.16' of git://
  drm/nouveau/bl: fix backlight regression
  drm/nouveau/bl: Fix oops on driver unbind
  drm/nouveau/mmu: ALIGN_DOWN correct variable

4 years agoMerge branch 'for-linus' of git://
Linus Torvalds [Fri, 16 Mar 2018 01:57:14 +0000 (18:57 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/viro/vfs

Pull vfs fixes from Al Viro:

 - backport-friendly part of lock_parent() race fix

 - a fix for an assumption in the heurisic used by path_connected() that
   is not true on NFS

 - livelock fixes for d_alloc_parallel()

* 'for-linus' of git://
  fs: Teach path_connected to handle nfs filesystems with multiple roots.
  fs: dcache: Use READ_ONCE when accessing i_dir_seq
  fs: dcache: Avoid livelock between d_alloc_parallel and __d_add
  lock_parent() needs to recheck if dentry got __dentry_kill'ed under it

4 years agodrm/nouveau/bl: fix backlight regression
Karol Herbst [Mon, 19 Feb 2018 16:09:45 +0000 (17:09 +0100)]
drm/nouveau/bl: fix backlight regression

Fixes: 3c66c87dc9 ("drm/nouveau/disp: remove hw-specific customisation
of output paths")
Suggested-by: Ben Skeggs <>
Signed-off-by: Karol Herbst <>
Signed-off-by: Ben Skeggs <>
4 years agodrm/nouveau/bl: Fix oops on driver unbind
Lukas Wunner [Sat, 17 Feb 2018 12:40:23 +0000 (13:40 +0100)]
drm/nouveau/bl: Fix oops on driver unbind

Unbinding nouveau on a dual GPU MacBook Pro oopses because we iterate
over the bl_connectors list in nouveau_backlight_exit() but skipped
initializing it in nouveau_backlight_init().  Stacktrace for posterity:

    BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
    IP: nouveau_backlight_exit+0x2b/0x70 [nouveau]
    nouveau_display_destroy+0x29/0x80 [nouveau]
    nouveau_drm_unload+0x65/0xe0 [nouveau]
    drm_dev_unregister+0x3c/0xe0 [drm]
    drm_put_dev+0x2e/0x60 [drm]
    nouveau_drm_device_remove+0x47/0x70 [nouveau]
    nouveau_drm_exit+0x15/0xfb0 [nouveau]

Fixes: b53ac1ee12a3 ("drm/nouveau/bl: Do not register interface if Apple GMUX detected")
Cc: # v4.10+
Cc: Pierre Moreau <>
Signed-off-by: Lukas Wunner <>
Signed-off-by: Ben Skeggs <>
4 years agodrm/nouveau/mmu: ALIGN_DOWN correct variable
Māris Nartišs [Fri, 16 Mar 2018 01:38:43 +0000 (11:38 +1000)]
drm/nouveau/mmu: ALIGN_DOWN correct variable

Commit 7110c89bb8852ff8b0f88ce05b332b3fe22bd11e ("mmu: swap out round
for ALIGN") replaced two calls to round/rounddown with ALIGN/ALIGN_DOWN,
but erroneously applied ALIGN_DOWN to a different variable (addr) and left
intended variable (tail) not rounded/ALIGNed.

As a result screen corruption, X lockups are observable. An example of kernel
log of affected system with NV98 card where it was bisected:

nouveau 0000:01:00.0: gr: TRAP_M2MF 00000002 [IN]
nouveau 0000:01:00.0: gr: TRAP_M2MF 00320951 400007c0 00000000 04000000
nouveau 0000:01:00.0: gr: 00200000 [] ch 1 [000fbbe000 DRM] subc 4 class 5039
mthd 0100 data 00000000
nouveau 0000:01:00.0: fb: trapped read at 0040000000 on channel 1
[0fbbe000 DRM]
engine 00 [PGRAPH] client 03 [DISPATCH] subclient 04 [M2M_IN] reason 00000006

Fixes bug 105173 ("[MCP79][Regression] Unhandled NULL pointer dereference in
nvkm_object_unmap since kernel 4.15")

Fixes: 7110c89bb885 ("mmu: swap out round for ALIGN ")
Tested-by: Pierre Moreau <>
Reviewed-by: Pierre Moreau <>
Signed-off-by: Maris Nartiss <>
Signed-off-by: Ben Skeggs <>
Cc: # v4.15+
4 years agofs: Teach path_connected to handle nfs filesystems with multiple roots.
Eric W. Biederman [Wed, 14 Mar 2018 23:20:29 +0000 (18:20 -0500)]
fs: Teach path_connected to handle nfs filesystems with multiple roots.

On nfsv2 and nfsv3 the nfs server can export subsets of the same
filesystem and report the same filesystem identifier, so that the nfs
client can know they are the same filesystem.  The subsets can be from
disjoint directory trees.  The nfsv2 and nfsv3 filesystems provides no
way to find the common root of all directory trees exported form the
server with the same filesystem identifier.

The practical result is that in struct super s_root for nfs s_root is
not necessarily the root of the filesystem.  The nfs mount code sets
s_root to the root of the first subset of the nfs filesystem that the
kernel mounts.

This effects the dcache invalidation code in generic_shutdown_super
currently called shrunk_dcache_for_umount and that code for years
has gone through an additional list of dentries that might be dentry
trees that need to be freed to accomodate nfs.

When I wrote path_connected I did not realize nfs was so special, and
it's hueristic for avoiding calling is_subdir can fail.

The practical case where this fails is when there is a move of a
directory from the subtree exposed by one nfs mount to the subtree
exposed by another nfs mount.  This move can happen either locally or
remotely.  With the remote case requiring that the move directory be cached
before the move and that after the move someone walks the path
to where the move directory now exists and in so doing causes the
already cached directory to be moved in the dcache through the magic
of d_splice_alias.

If someone whose working directory is in the move directory or a
subdirectory and now starts calling .. from the initial mount of nfs
(where s_root == mnt_root), then path_connected as a heuristic will
not bother with the is_subdir check.  As s_root really is not the root
of the nfs filesystem this heuristic is wrong, and the path may
actually not be connected and path_connected can fail.

The is_subdir function might be cheap enough that we can call it
unconditionally.  Verifying that will take some benchmarking and
the result may not be the same on all kernels this fix needs
to be backported to.  So I am avoiding that for now.

Filesystems with snapshots such as nilfs and btrfs do something
similar.  But as the directory tree of the snapshots are disjoint
from one another and from the main directory tree rename won't move
things between them and this problem will not occur.

Reported-by: Al Viro <>
Fixes: 397d425dc26d ("vfs: Test for and handle paths that are unreachable from their mnt_root")
Signed-off-by: "Eric W. Biederman" <>
Signed-off-by: Al Viro <>
4 years agoMerge tag 'gvt-fixes-2018-03-15' of into drm-intel...
Rodrigo Vivi [Thu, 15 Mar 2018 22:37:56 +0000 (15:37 -0700)]
Merge tag 'gvt-fixes-2018-03-15' of into drm-intel-fixes


- Two warnings fix for runtime pm and usr copy (Xiong, Zhenyu)
- OA context fix for vGPU profiling (Min)
- privilege batch buffer reloc fix (Fred)

Signed-off-by: Rodrigo Vivi <>
4 years agosparc64: Fix regression in pmdp_invalidate().
David S. Miller [Thu, 15 Mar 2018 21:18:00 +0000 (14:18 -0700)]
sparc64: Fix regression in pmdp_invalidate().

pmdp_invalidate() was changed to update the pmd atomically
(to not lose dirty/access bits) and return the original pmd

However, in doing so, we lost a lot of the essential work that
set_pmd_at() does, namely to update hugepage mapping counts and
queuing up the batched TLB flush entry.

Thus we were not flushing entries out of the TLB when making
such PMD changes.

Fix this by abstracting the accounting work of set_pmd_at() out into a
separate function, and call it from pmdp_establish().

Fixes: a8e654f01cb7 ("sparc64: update pmdp_invalidate() to return old pmd value")
Signed-off-by: David S. Miller <>
4 years agoMerge tag 'kvm-ppc-fixes-4.16-2' of git://
Paolo Bonzini [Thu, 15 Mar 2018 20:57:26 +0000 (21:57 +0100)]
Merge tag 'kvm-ppc-fixes-4.16-2' of git://git./linux/kernel/git/paulus/powerpc into kvm-master

Fix for PPC KVM for 4.16

- Fix bug leading to lost IPIs on POWER9 and hence to other CPUs reporting
  lockups in smp_call_function_many().

4 years agoMerge tag 'kvm-arm-fixes-for-v4.16-2' of git://
Paolo Bonzini [Thu, 15 Mar 2018 20:45:37 +0000 (21:45 +0100)]
Merge tag 'kvm-arm-fixes-for-v4.16-2' of git://git./linux/kernel/git/kvmarm/kvmarm into kvm-master

kvm/arm fixes for 4.16, take 2

- Peace of mind locking fix in vgic_mmio_read_pending
- Allow hw-mapped interrupts to be reset when the VM resets
- Fix GICv2 multi-source SGI injection
- Fix MMIO synchronization for GICv2 on v3 emulation
- Remove excess verbosity on the console

4 years agoclk: aspeed: Prevent reset if clock is enabled
Eddie James [Thu, 8 Mar 2018 20:57:20 +0000 (14:57 -0600)]
clk: aspeed: Prevent reset if clock is enabled

According to the Aspeed specification, the reset and enable sequence
should be done when the clock is stopped. The specification doesn't
define behavior if the reset is done while the clock is enabled.

From testing on the AST2500, the LPC Controller has problems if the
clock is reset while enabled.

Therefore, check whether the clock is enabled or not before performing
the reset and enable sequence in the Aspeed clock driver.

Reported-by: Lei Yu <>
Signed-off-by: Eddie James <>
Fixes: 15ed8ce5f84e ("clk: aspeed: Register gated clocks")
Reviewed-by: Joel Stanley <>
Signed-off-by: Stephen Boyd <>
4 years agoclk: aspeed: Fix is_enabled for certain clocks
Eddie James [Thu, 8 Mar 2018 20:57:19 +0000 (14:57 -0600)]
clk: aspeed: Fix is_enabled for certain clocks

Some of the Aspeed clocks are disabled by setting the relevant bit in
the "clock stop control" register to one, while others are disabled by
setting their bit to zero. The driver already uses a flag per gate  to
identify this behavior, but doesn't apply it in the clock is_enabled

Use the existing gate flag to correctly return whether or not a clock
is enabled in the aspeed_clk_is_enabled function.

Signed-off-by: Eddie James <>
Fixes: 6671507f0fbd ("clk: aspeed: Handle inverse polarity of USB port 1 clock gate")
Reviewed-by: Joel Stanley <>
Signed-off-by: Stephen Boyd <>
4 years agoMerge tag 'sound-4.16-rc6' of git://
Linus Torvalds [Thu, 15 Mar 2018 18:07:35 +0000 (11:07 -0700)]
Merge tag 'sound-4.16-rc6' of git://git./linux/kernel/git/tiwai/sound

Pull sound fixes from Takashi Iwai:
 "A series of small fixes in ASoC, HD-audio and core stuff:

   - a UAF fix in ALSA PCM core

   - yet more hardening for ALSA sequencer

   - a regression fix for the previous HD-audio power_save option change

   - various ASoC codec fixes (sgtl5000, rt5651, hdmi-codec, wm_adsp)

   - minor ASoC platform fixes (AMD ACP, sun4i)"

* tag 'sound-4.16-rc6' of git://
  ALSA: hda - Revert power_save option default value
  ALSA: pcm: Fix UAF in snd_pcm_oss_get_formats()
  ALSA: seq: Clear client entry before deleting else at closing
  ALSA: seq: Fix possible UAF in snd_seq_check_queue()
  ASoC: amd: 16bit resolution support for i2s sp instance
  ASoC: wm_adsp: For TLV controls only register TLV get/set
  ASoC: sun4i-i2s: Fix RX slot number of SUN8I
  ASoC: hdmi-codec: Fix module unloading caused kernel crash
  ASoC: rt5651: Fix regcache sync errors on resume
  ASoC: sgtl5000: Fix suspend/resume
  MAINTAINERS: Add myself as sgtl5000 maintainer
  ASoC: samsung: Add the DT binding files entry to MAINTAINERS
  sgtl5000: change digital_mute policy

4 years agoMerge tag 'for-4.16/dm-fixes-3' of git://
Linus Torvalds [Thu, 15 Mar 2018 18:04:46 +0000 (11:04 -0700)]
Merge tag 'for-4.16/dm-fixes-3' of git://git./linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - a stable DM multipath fix to restore ability to pass integrity data

 - two DM multipath fixes for a fix that was merged into 4.16-rc5

* tag 'for-4.16/dm-fixes-3' of git://
  dm mpath: fix passing integrity data
  dm mpath: eliminate need to use scsi_device_from_queue
  dm mpath: fix uninitialized 'pg_init_wait' waitqueue_head NULL pointer

4 years agodrm/i915/gvt: fix user copy warning by whitelist workload rb_tail field
Zhenyu Wang [Wed, 14 Feb 2018 03:35:01 +0000 (11:35 +0800)]
drm/i915/gvt: fix user copy warning by whitelist workload rb_tail field

This is to fix warning got as:

[ 6730.476938] ------------[ cut here ]------------
[ 6730.476979] Bad or missing usercopy whitelist? Kernel memory exposure attempt detected from SLAB object 'gvt-g_vgpu_workload' (offset 120, size 4)!
[ 6730.477021] WARNING: CPU: 2 PID: 441 at mm/usercopy.c:81 usercopy_warn+0x7e/0xa0
[ 6730.477042] Modules linked in: tun(E) bridge(E) stp(E) llc(E) kvmgt(E) x86_pkg_temp_thermal(E) vfio_mdev(E) intel_powerclamp(E) mdev(E) coretemp(E) vfio_iommu_type1(E) vfio(E) kvm_intel(E) kvm(E) hid_generic(E) irqbypass(E) crct10dif_pclmul(E) crc32_pclmul(E) usbhid(E) i915(E) crc32c_intel(E) hid(E) ghash_clmulni_intel(E) pcbc(E) aesni_intel(E) aes_x86_64(E) crypto_simd(E) cryptd(E) glue_helper(E) intel_cstate(E) idma64(E) evdev(E) virt_dma(E) iTCO_wdt(E) intel_uncore(E) intel_rapl_perf(E) intel_lpss_pci(E) sg(E) shpchp(E) mei_me(E) pcspkr(E) iTCO_vendor_support(E) intel_lpss(E) intel_pch_thermal(E) prime_numbers(E) mei(E) mfd_core(E) video(E) acpi_pad(E) button(E) binfmt_misc(E) ip_tables(E) x_tables(E) autofs4(E) ext4(E) crc16(E) mbcache(E) jbd2(E) fscrypto(E) sd_mod(E) e1000e(E) xhci_pci(E) sdhci_pci(E)
[ 6730.477244]  ptp(E) cqhci(E) xhci_hcd(E) pps_core(E) sdhci(E) mmc_core(E) i2c_i801(E) usbcore(E) thermal(E) fan(E)
[ 6730.477276] CPU: 2 PID: 441 Comm: gvt workload 0 Tainted: G            E    4.16.0-rc1-gvt-staging-0213+ #127
[ 6730.477303] Hardware name:  /NUC6i5SYB, BIOS SYSKLi35.86A.0039.2016.0316.1747 03/16/2016
[ 6730.477326] RIP: 0010:usercopy_warn+0x7e/0xa0
[ 6730.477340] RSP: 0018:ffffba6301223d18 EFLAGS: 00010286
[ 6730.477355] RAX: 0000000000000000 RBX: ffff8f41caae9838 RCX: 0000000000000006
[ 6730.477375] RDX: 0000000000000007 RSI: 0000000000000082 RDI: ffff8f41dad166f0
[ 6730.477395] RBP: 0000000000000004 R08: 0000000000000576 R09: 0000000000000000
[ 6730.477415] R10: ffffffffb1293fb2 R11: 00000000ffffffff R12: 0000000000000001
[ 6730.477447] R13: ffff8f41caae983c R14: ffff8f41caae9838 R15: 00007f183ca2b000
[ 6730.477467] FS:  0000000000000000(0000) GS:ffff8f41dad00000(0000) knlGS:0000000000000000
[ 6730.477489] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 6730.477506] CR2: 0000559462817291 CR3: 000000028b46c006 CR4: 00000000003626e0
[ 6730.477526] Call Trace:
[ 6730.477537]  __check_object_size+0x9c/0x1a0
[ 6730.477562]  __kvm_write_guest_page+0x45/0x90 [kvm]
[ 6730.477585]  kvm_write_guest+0x46/0x80 [kvm]
[ 6730.477599]  kvmgt_rw_gpa+0x9b/0xf0 [kvmgt]
[ 6730.477642]  workload_thread+0xa38/0x1040 [i915]
[ 6730.477659]  ? do_wait_intr_irq+0xc0/0xc0
[ 6730.477673]  ? finish_wait+0x80/0x80
[ 6730.477707]  ? clean_workloads+0x120/0x120 [i915]
[ 6730.477722]  kthread+0x111/0x130
[ 6730.477733]  ? _kthread_create_worker_on_cpu+0x60/0x60
[ 6730.477750]  ? exit_to_usermode_loop+0x6f/0xb0
[ 6730.477766]  ret_from_fork+0x35/0x40
[ 6730.477777] Code: 48 c7 c0 20 e3 25 b1 48 0f 44 c2 41 50 51 41 51 48 89 f9 49 89 f1 4d 89 d8 4c 89 d2 48 89 c6 48 c7 c7 78 e3 25 b1 e8 b2 bc e4 ff <0f> ff 48 83 c4 18 c3 48 c7 c6 09 d0 26 b1 49 89 f1 49 89 f3 eb
[ 6730.477849] ---[ end trace cae869c1c323e45a ]---

By whitelist guest page write from workload struct allocated from kmem cache.

Reviewed-by: Hang Yuan <>
Signed-off-by: Zhenyu Wang <>
(cherry picked from commit 5627705406874df57fdfad3b4e0c9aedd3b007df)

4 years agodrm/i915/gvt: Correct the privilege shadow batch buffer address
fred gao [Thu, 15 Mar 2018 05:21:10 +0000 (13:21 +0800)]
drm/i915/gvt: Correct the privilege shadow batch buffer address

Once the ring buffer is copied to ring_scan_buffer and scanned,
the shadow batch buffer start address is only updated into
ring_scan_buffer, not the real ring address allocated through
intel_ring_begin in later copy_workload_to_ring_buffer.

This patch is only to set the right shadow batch buffer address
from Ring buffer, not include the shadow_wa_ctx.

- refine some comments. (Zhenyu)
- fix typo in title. (Zhenyu)
- remove the unnecessary comments. (Zhenyu)
- add comments in bb_start_cmd_va update. (Zhenyu)

Fixes: 0a53bc07f044 ("drm/i915/gvt: Separate cmd scan from request allocation")
Cc: # v4.15
Cc: Zhenyu Wang <>
Cc: Yulei Zhang <>
Signed-off-by: fred gao <>
Signed-off-by: Zhenyu Wang <>
4 years agoMerge tag 'scsi-fixes' of git://
Linus Torvalds [Thu, 15 Mar 2018 00:02:49 +0000 (17:02 -0700)]
Merge tag 'scsi-fixes' of git://git./linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:
 "This is four patches, consisting of one regression from the merge
  window (qla2xxx), one long-standing memory leak (sd_zbc), one event
  queue mislabelling which we want to eliminate to discourage the
  pattern (mpt3sas), and one behaviour change because re-reading the
  partition table shouldn't clear the ro flag"

* tag 'scsi-fixes' of git://
  scsi: sd: Keep disk read-only when re-reading partition
  scsi: qla2xxx: Fix crashes in qla2x00_probe_one on probe failure
  scsi: sd_zbc: Fix potential memory leak
  scsi: mpt3sas: Do not mark fw_event workqueue as WQ_MEM_RECLAIM

4 years agobtree: avoid variable-length allocations
Joern Engel [Tue, 13 Mar 2018 18:36:49 +0000 (11:36 -0700)]
btree: avoid variable-length allocations

geo->keylen cannot be larger than 4.  So we might as well make
fixed-size allocations.

Given the one remaining user, geo->keylen cannot even be larger than 1.
Logfs used to have 64bit and 128bit keys, tcm_qla2xxx only has 32bit
keys.  But let's not break the code if we don't have to.

Signed-off-by: Joern Engel <>
Signed-off-by: Linus Torvalds <>
4 years agoMerge branch 'percpu_ref-rcu-audit-fixes' of git://
Linus Torvalds [Wed, 14 Mar 2018 23:51:33 +0000 (16:51 -0700)]
Merge branch 'percpu_ref-rcu-audit-fixes' of git://git./linux/kernel/git/tj/misc

Pull percpu_ref rcu fixes from Tejun Heo:
 "Jann Horn found that aio was depending on the internal RCU grace
  periods of percpu-ref and that it's broken because aio uses regular
  RCU while percpu_ref uses sched-RCU.

  Depending on percpu_ref's internal grace periods isn't a good idea

   - The RCU type might not match.

   - percpu_ref's grace periods are used to switch to atomic mode. They
     aren't between the last put and the invocation of the last release.
     This is easy to get confused about and can lead to subtle bugs.

   - percpu_ref might not have grace periods at all depending on its
     current operation mode.

  This patchset audits and fixes percpu_ref users for their RCU usages"

[ There's a continuation of this series that clarifies percpu_ref
  documentation that the internal grace periods must not be depended
  upon, and introduces rcu_work to simplify bouncing to a workqueue
  after an RCU grace period.

  That will go in for 4.17 - this is just the minimal set with the fixes
  that are tagged for -stable ]

* 'percpu_ref-rcu-audit-fixes' of git://
  RDMAVT: Fix synchronization around percpu_ref
  fs/aio: Use RCU accessors for kioctx_table->table[]
  fs/aio: Add explicit RCU grace period when freeing kioctx

4 years agoRevert "mm/page_alloc: fix memmap_init_zone pageblock alignment"
Ard Biesheuvel [Wed, 14 Mar 2018 19:29:37 +0000 (19:29 +0000)]
Revert "mm/page_alloc: fix memmap_init_zone pageblock alignment"

This reverts commit 864b75f9d6b0100bb24fdd9a20d156e7cda9b5ae.

Commit 864b75f9d6b0 ("mm/page_alloc: fix memmap_init_zone pageblock
alignment") modified the logic in memmap_init_zone() to initialize
struct pages associated with invalid PFNs, to appease a VM_BUG_ON()
in move_freepages(), which is redundant by its own admission, and
dereferences struct page fields to obtain the zone without checking
whether the struct pages in question are valid to begin with.

Commit 864b75f9d6b0 only makes it worse, since the rounding it does
may cause pfn assume the same value it had in a prior iteration of
the loop, resulting in an infinite loop and a hang very early in the
boot. Also, since it doesn't perform the same rounding on start_pfn
itself but only on intermediate values following an invalid PFN, we
may still hit the same VM_BUG_ON() as before.

So instead, let's fix this at the core, and ensure that the BUG
check doesn't dereference struct page fields of invalid pages.

Fixes: 864b75f9d6b0 ("mm/page_alloc: fix memmap_init_zone pageblock alignment")
Tested-by: Jan Glauber <>
Tested-by: Shanker Donthineni <>
Cc: Daniel Vacek <>
Cc: Mel Gorman <>
Cc: Michal Hocko <>
Cc: Paul Burton <>
Cc: Pavel Tatashin <>
Cc: Vlastimil Babka <>
Cc: Andrew Morton <>
Signed-off-by: Ard Biesheuvel <>
Signed-off-by: Linus Torvalds <>
4 years agoMerge tag 'drm-intel-fixes-2018-03-14' of git://
Dave Airlie [Wed, 14 Mar 2018 23:26:11 +0000 (09:26 +1000)]
Merge tag 'drm-intel-fixes-2018-03-14' of git:// into drm-fixes

- 1 display fix for bxt
- 1 gem fix for fences
- 1 gem/pm fix for rps freq

* tag 'drm-intel-fixes-2018-03-14' of git://
  drm/i915: Kick the rps worker when changing the boost frequency
  drm/i915: Only prune fences after wait-for-all
  drm/i915: Enable VBT based BL control for DP

4 years agoMerge branch 'drm-fixes-4.16' of git:// into drm...
Dave Airlie [Wed, 14 Mar 2018 23:23:54 +0000 (09:23 +1000)]
Merge branch 'drm-fixes-4.16' of git:// into drm-fixes

A few fixes for 4.16:
- Fix a backlight S/R regression on amdgpu
- Fix prime teardown on radeon and amdgpu
- DP fix for amdgpu

* 'drm-fixes-4.16' of git://
  drm/amdgpu/dce: Don't turn off DP sink when disconnected
  drm/amdgpu: save/restore backlight level in legacy dce code
  drm/radeon: fix prime teardown order
  drm/amdgpu: fix prime teardown order

4 years agoinfiniband: bnxt_re: use BIT_ULL() for 64-bit bit masks
Arnd Bergmann [Tue, 20 Feb 2018 20:56:27 +0000 (21:56 +0100)]
infiniband: bnxt_re: use BIT_ULL() for 64-bit bit masks

On 32-bit targets, we otherwise get a warning about an impossible constant
integer expression:

In file included from include/linux/kernel.h:11,
                 from include/linux/interrupt.h:6,
                 from drivers/infiniband/hw/bnxt_re/ib_verbs.c:39:
drivers/infiniband/hw/bnxt_re/ib_verbs.c: In function 'bnxt_re_query_device':
include/linux/bitops.h:7:24: error: left shift count >= width of type [-Werror=shift-count-overflow]
 #define BIT(nr)   (1UL << (nr))
drivers/infiniband/hw/bnxt_re/bnxt_re.h:61:34: note: in expansion of macro 'BIT'
drivers/infiniband/hw/bnxt_re/bnxt_re.h:62:30: note: in expansion of macro 'BNXT_RE_MAX_MR_SIZE_HIGH'
drivers/infiniband/hw/bnxt_re/ib_verbs.c:149:25: note: in expansion of macro 'BNXT_RE_MAX_MR_SIZE'
  ib_attr->max_mr_size = BNXT_RE_MAX_MR_SIZE;

Fixes: 872f3578241d ("RDMA/bnxt_re: Add support for MRs with Huge pages")
Signed-off-by: Arnd Bergmann <>
Signed-off-by: Jason Gunthorpe <>
4 years agoinfiniband: qplib_fp: fix pointer cast
Arnd Bergmann [Tue, 20 Feb 2018 20:56:26 +0000 (21:56 +0100)]
infiniband: qplib_fp: fix pointer cast

Building for a 32-bit target results in a couple of warnings from casting
between a 32-bit pointer and a 64-bit integer:

drivers/infiniband/hw/bnxt_re/qplib_fp.c: In function 'bnxt_qplib_service_nq':
drivers/infiniband/hw/bnxt_re/qplib_fp.c:333:23: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
    bnxt_qplib_arm_srq((struct bnxt_qplib_srq *)q_handle,
drivers/infiniband/hw/bnxt_re/qplib_fp.c:336:12: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
            (struct bnxt_qplib_srq *)q_handle,
In file included from include/linux/byteorder/little_endian.h:5,
                 from arch/arm/include/uapi/asm/byteorder.h:22,
                 from include/asm-generic/bitops/le.h:6,
                 from arch/arm/include/asm/bitops.h:342,
                 from include/linux/bitops.h:38,
                 from include/linux/kernel.h:11,
                 from include/linux/interrupt.h:6,
                 from drivers/infiniband/hw/bnxt_re/qplib_fp.c:39:
drivers/infiniband/hw/bnxt_re/qplib_fp.c: In function 'bnxt_qplib_create_srq':
include/uapi/linux/byteorder/little_endian.h:31:43: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
 #define __cpu_to_le64(x) ((__force __le64)(__u64)(x))
include/linux/byteorder/generic.h:86:21: note: in expansion of macro '__cpu_to_le64'
 #define cpu_to_le64 __cpu_to_le64
drivers/infiniband/hw/bnxt_re/qplib_fp.c:569:19: note: in expansion of macro 'cpu_to_le64'
  req.srq_handle = cpu_to_le64(srq);

Using a uintptr_t as an intermediate works on all architectures.

Fixes: 37cb11acf1f7 ("RDMA/bnxt_re: Add SRQ support for Broadcom adapters")
Signed-off-by: Arnd Bergmann <>
Signed-off-by: Jason Gunthorpe <>
4 years agobtrfs: add missing initialization in btrfs_check_shared
Edmund Nadolski [Wed, 14 Mar 2018 15:03:11 +0000 (09:03 -0600)]
btrfs: add missing initialization in btrfs_check_shared

This patch addresses an issue that causes fiemap to falsely
report a shared extent.  The test case is as follows:

xfs_io -f -d -c "pwrite -b 16k 0 64k" -c "fiemap -v" /media/scratch/file5
xfs_io  -c "fiemap -v" /media/scratch/file5

which gives the resulting output:

wrote 65536/65536 bytes at offset 0
64 KiB, 4 ops; 0.0000 sec (121.359 MiB/sec and 7766.9903 ops/sec)
   0: [0..127]:        24576..24703       128 0x2001
   0: [0..127]:        24576..24703       128   0x1

This is because btrfs_check_shared calls find_parent_nodes
repeatedly in a loop, passing a share_check struct to report
the count of shared extent. But btrfs_check_shared does not
re-initialize the count value to zero for subsequent calls
from the loop, resulting in a false share count value. This
is a regressive behavior from 4.13.

With proper re-initialization the test result is as follows:

wrote 65536/65536 bytes at offset 0
64 KiB, 4 ops; 0.0000 sec (110.035 MiB/sec and 7042.2535 ops/sec)
   0: [0..127]:        24576..24703       128   0x1
   0: [0..127]:        24576..24703       128   0x1

which corrects the regression.

Fixes: 3ec4d3238ab ("btrfs: allow backref search checks for shared extents")
Signed-off-by: Edmund Nadolski <>
[ add text from cover letter to changelog ]
Signed-off-by: David Sterba <>
4 years agobtrfs: Fix NULL pointer exception in find_bio_stripe
Dmitriy Gorokh [Fri, 16 Feb 2018 19:51:38 +0000 (19:51 +0000)]
btrfs: Fix NULL pointer exception in find_bio_stripe

On detaching of a disk which is a part of a RAID6 filesystem, the
following kernel OOPS may happen:

[63122.680461] BTRFS error (device sdo): bdev /dev/sdo errs: wr 0, rd 0, flush 1, corrupt 0, gen 0
[63122.719584] BTRFS warning (device sdo): lost page write due to IO error on /dev/sdo
[63122.719587] BTRFS error (device sdo): bdev /dev/sdo errs: wr 1, rd 0, flush 1, corrupt 0, gen 0
[63122.803516] BTRFS warning (device sdo): lost page write due to IO error on /dev/sdo
[63122.803519] BTRFS error (device sdo): bdev /dev/sdo errs: wr 2, rd 0, flush 1, corrupt 0, gen 0
[63122.863902] BTRFS critical (device sdo): fatal error on device /dev/sdo
[63122.935338] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[63122.946554] IP: fail_bio_stripe+0x58/0xa0 [btrfs]
[63122.958185] PGD 9ecda067 P4D 9ecda067 PUD b2b37067 PMD 0
[63122.971202] Oops: 0000 [#1] SMP
[63123.006760] CPU: 0 PID: 3979 Comm: kworker/u8:9 Tainted: G W 4.14.2-16-scst34x+ #8
[63123.007091] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[63123.007402] Workqueue: btrfs-worker btrfs_worker_helper [btrfs]
[63123.007595] task: ffff880036ea4040 task.stack: ffffc90006384000
[63123.007796] RIP: 0010:fail_bio_stripe+0x58/0xa0 [btrfs]
[63123.007968] RSP: 0018:ffffc90006387ad8 EFLAGS: 00010287
[63123.008140] RAX: 0000000000000002 RBX: ffff88004beaa0b8 RCX: ffff8800b2bd5690
[63123.008359] RDX: 0000000000000000 RSI: ffff88007bb43500 RDI: ffff88004beaa000
[63123.008621] RBP: ffffc90006387ae8 R08: 0000000099100000 R09: ffff8800b2bd5600
[63123.008840] R10: 0000000000000004 R11: 0000000000010000 R12: ffff88007bb43500
[63123.009059] R13: 00000000fffffffb R14: ffff880036fc5180 R15: 0000000000000004
[63123.009278] FS: 0000000000000000(0000) GS:ffff8800b7000000(0000) knlGS:0000000000000000
[63123.009564] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[63123.009748] CR2: 0000000000000080 CR3: 00000000b0866000 CR4: 00000000000406f0
[63123.009969] Call Trace:
[63123.010085] raid_write_end_io+0x7e/0x80 [btrfs]
[63123.010251] bio_endio+0xa1/0x120
[63123.010378] generic_make_request+0x218/0x270
[63123.010921] submit_bio+0x66/0x130
[63123.011073] finish_rmw+0x3fc/0x5b0 [btrfs]
[63123.011245] full_stripe_write+0x96/0xc0 [btrfs]
[63123.011428] raid56_parity_write+0x117/0x170 [btrfs]
[63123.011604] btrfs_map_bio+0x2ec/0x320 [btrfs]
[63123.011759] ? ___cache_free+0x1c5/0x300
[63123.011909] __btrfs_submit_bio_done+0x26/0x50 [btrfs]
[63123.012087] run_one_async_done+0x9c/0xc0 [btrfs]
[63123.012257] normal_work_helper+0x19e/0x300 [btrfs]
[63123.012429] btrfs_worker_helper+0x12/0x20 [btrfs]
[63123.012656] process_one_work+0x14d/0x350
[63123.012888] worker_thread+0x4d/0x3a0
[63123.013026] ? _raw_spin_unlock_irqrestore+0x15/0x20
[63123.013192] kthread+0x109/0x140
[63123.013315] ? process_scheduled_works+0x40/0x40
[63123.013472] ? kthread_stop+0x110/0x110
[63123.013610] ret_from_fork+0x25/0x30
[63123.014469] RIP: fail_bio_stripe+0x58/0xa0 [btrfs] RSP: ffffc90006387ad8
[63123.014678] CR2: 0000000000000080
[63123.016590] ---[ end trace a295ea7259c17880 ]—

This is reproducible in a cycle, where a series of writes is followed by
SCSI device delete command. The test may take up to few minutes.

Fixes: 74d46992e0d9 ("block: replace bi_bdev with a gendisk pointer and partitions index")
[ no signed-off-by provided ]
Author: Dmitriy Gorokh <>
Reviewed-by: Liu Bo <>
Reviewed-by: David Sterba <>
Signed-off-by: David Sterba <>
4 years agoIB/mlx5: Fix cleanup order on unload
Mark Bloch [Wed, 14 Mar 2018 07:14:15 +0000 (09:14 +0200)]
IB/mlx5: Fix cleanup order on unload

On load we create private CQ/QP/PD in order to be used by UMR, we create
those resources after we register ourself as an IB device, and we destroy
them after we unregister as an IB device. This was changed by commit
16c1975f1032 ("IB/mlx5: Create profile infrastructure to add and remove
stages") which moved the destruction before we unregistration. This
allowed to trigger an invalid memory access when unloading mlx5_ib while
there are open resources:

BUG: unable to handle kernel paging request at 00000001002c012c
Call Trace:
 mlx5_ib_post_send_wait+0x75/0x110 [mlx5_ib]
 delay_time_func+0x10/0x10 [mlx5_ib]
 unreg_umr.isra.15+0x4b/0x50 [mlx5_ib]
 mlx5_mr_cache_free+0x46/0x150 [mlx5_ib]
 clean_mr+0xc9/0x190 [mlx5_ib]
 dereg_mr+0xba/0xf0 [mlx5_ib]
 ib_dereg_mr+0x13/0x20 [ib_core]
 remove_commit_idr_uobject+0x16/0x70 [ib_uverbs]
 uverbs_cleanup_ucontext+0xe8/0x1a0 [ib_uverbs]
 ib_uverbs_cleanup_ucontext.isra.9+0x19/0x40 [ib_uverbs]
 ib_uverbs_remove_one+0x162/0x2e0 [ib_uverbs]
 ib_unregister_device+0xd4/0x190 [ib_core]
 __mlx5_ib_remove+0x2e/0x40 [mlx5_ib]
 mlx5_remove_device+0xf5/0x120 [mlx5_core]
 mlx5_unregister_interface+0x37/0x90 [mlx5_core]
 mlx5_ib_cleanup+0xc/0x225 [mlx5_ib]

We restore the original behavior by breaking the UMR stage into two parts,
pre and post IB registration stages, this way we can restore the original
functionality and maintain clean separation of logic between stages.

Fixes: 16c1975f1032 ("IB/mlx5: Create profile infrastructure to add and remove stages")
Signed-off-by: Mark Bloch <>
Signed-off-by: Leon Romanovsky <>
Signed-off-by: Doug Ledford <>
4 years agodrm/amdgpu/dce: Don't turn off DP sink when disconnected
Michel Dänzer [Fri, 9 Mar 2018 17:26:18 +0000 (18:26 +0100)]
drm/amdgpu/dce: Don't turn off DP sink when disconnected

Turning off the sink in this case causes various issues, because
userspace expects it to stay on until it turns it off explicitly.

Instead, turn the sink off and back on when a display is connected
again. This dance seems necessary for link training to work correctly.

Reviewed-by: Alex Deucher <>
Signed-off-by: Michel Dänzer <>
Signed-off-by: Alex Deucher <>
4 years agodrm/amdgpu: save/restore backlight level in legacy dce code
Alex Deucher [Thu, 8 Mar 2018 14:56:01 +0000 (09:56 -0500)]
drm/amdgpu: save/restore backlight level in legacy dce code

Save/restore the backlight level scratch register in S3/S4 so the
backlight level comes back at the previously requested level.

Fixes: 4ec6ecf48c64d (drm/amdgpu: drop scratch regs save and restore from S3/S4 handling)
Acked-by: Michel Dänzer <>
Reviewed-by: Harry Wentland <>
Signed-off-by: Alex Deucher <>
4 years agodrm/radeon: fix prime teardown order
Christian König [Fri, 9 Mar 2018 13:44:32 +0000 (14:44 +0100)]
drm/radeon: fix prime teardown order

We unmapped imported DMA-bufs when the GEM handle was dropped, not when the
hardware was done with the buffere.

Signed-off-by: Christian König <>
Reviewed-by: Michel Dänzer <>
Signed-off-by: Alex Deucher <>
4 years agodrm/amdgpu: fix prime teardown order
Christian König [Fri, 9 Mar 2018 13:42:54 +0000 (14:42 +0100)]
drm/amdgpu: fix prime teardown order

We unmapped imported DMA-bufs when the GEM handle was dropped, not when the
hardware was done with the buffere.

Signed-off-by: Christian König <>
Reviewed-by: Michel Dänzer <>
Signed-off-by: Alex Deucher <>
4 years agoRDMA/ucma: Don't allow join attempts for unsupported AF family
Leon Romanovsky [Tue, 13 Mar 2018 16:37:27 +0000 (18:37 +0200)]
RDMA/ucma: Don't allow join attempts for unsupported AF family

Users can provide garbage while calling to ucma_join_ip_multicast(),
it will indirectly cause to rdma_addr_size() return 0, making the
call to ucma_process_join(), which had the right checks, but it is
better to check the input as early as possible.

The following crash from syzkaller revealed it.

kernel BUG at lib/string.c:1052!
invalid opcode: 0000 [#1] SMP KASAN Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 4113 Comm: syz-executor0 Not tainted 4.16.0-rc5+ #261
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:fortify_panic+0x13/0x20 lib/string.c:1051
RSP: 0018:ffff8801ca81f8f0 EFLAGS: 00010286
RAX: 0000000000000022 RBX: 1ffff10039503f23 RCX: 0000000000000000
RDX: 0000000000000022 RSI: 1ffff10039503ed3 RDI: ffffed0039503f12
RBP: ffff8801ca81f8f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000006 R11: 0000000000000000 R12: ffff8801ca81f998
R13: ffff8801ca81f938 R14: ffff8801ca81fa58 R15: 000000000000fa00
FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:000000000a12a900
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000008138024 CR3: 00000001cbb58004 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 memcpy include/linux/string.h:344 [inline]
 ucma_join_ip_multicast+0x36b/0x3b0 drivers/infiniband/core/ucma.c:1421
 ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1633
 __vfs_write+0xef/0x970 fs/read_write.c:480
 vfs_write+0x189/0x510 fs/read_write.c:544
 SYSC_write fs/read_write.c:589 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:581
 do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
 do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f9ec99
RSP: 002b:00000000ff8172cc EFLAGS: 00000282 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000100
RDX: 0000000000000063 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 0b 48 89 df e8 42 2c e3 fb eb de
55 48 89 fe 48 c7 c7 80 75 98 86 48 89 e5 e8 85 95 94 fb <0f> 0b 90 90 90 90
90 90 90 90 90 90 90 55 48 89 e5 41 57 41 56
RIP: fortify_panic+0x13/0x20 lib/string.c:1051 RSP: ffff8801ca81f8f0

Fixes: 5bc2b7b397b0 ("RDMA/ucma: Allow user space to specify AF_IB when joining multicast")
Reported-by: <>
Signed-off-by: Leon Romanovsky <>
Reviewed-by: Sean Hefty <>
Signed-off-by: Doug Ledford <>
4 years agoRDMA/ucma: Fix access to non-initialized CM_ID object
Leon Romanovsky [Tue, 13 Mar 2018 09:43:23 +0000 (11:43 +0200)]
RDMA/ucma: Fix access to non-initialized CM_ID object

The attempt to join multicast group without ensuring that CMA device
exists will lead to the following crash reported by syzkaller.

[   64.076794] BUG: KASAN: null-ptr-deref in rdma_join_multicast+0x26e/0x12c0
[   64.076797] Read of size 8 at addr 00000000000000b0 by task join/691
[   64.076797]
[   64.076800] CPU: 1 PID: 691 Comm: join Not tainted 4.16.0-rc1-00219-gb97853b65b93 #23
[   64.076802] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.11.0-0-g63451fca13-prebuilt.qemu-proj4
[   64.076803] Call Trace:
[   64.076809]  dump_stack+0x5c/0x77
[   64.076817]  kasan_report+0x163/0x380
[   64.085859]  ? rdma_join_multicast+0x26e/0x12c0
[   64.086634]  rdma_join_multicast+0x26e/0x12c0
[   64.087370]  ? rdma_disconnect+0xf0/0xf0
[   64.088579]  ? __radix_tree_replace+0xc3/0x110
[   64.089132]  ? node_tag_clear+0x81/0xb0
[   64.089606]  ? idr_alloc_u32+0x12e/0x1a0
[   64.090517]  ? __fprop_inc_percpu_max+0x150/0x150
[   64.091768]  ? tracing_record_taskinfo+0x10/0xc0
[   64.092340]  ? idr_alloc+0x76/0xc0
[   64.092951]  ? idr_alloc_u32+0x1a0/0x1a0
[   64.093632]  ? ucma_process_join+0x23d/0x460
[   64.094510]  ucma_process_join+0x23d/0x460
[   64.095199]  ? ucma_migrate_id+0x440/0x440
[   64.095696]  ? futex_wake+0x10b/0x2a0
[   64.096159]  ucma_join_multicast+0x88/0xe0
[   64.096660]  ? ucma_process_join+0x460/0x460
[   64.097540]  ? _copy_from_user+0x5e/0x90
[   64.098017]  ucma_write+0x174/0x1f0
[   64.098640]  ? ucma_resolve_route+0xf0/0xf0
[   64.099343]  ? rb_erase_cached+0x6c7/0x7f0
[   64.099839]  __vfs_write+0xc4/0x350
[   64.100622]  ? perf_syscall_enter+0xe4/0x5f0
[   64.101335]  ? kernel_read+0xa0/0xa0
[   64.103525]  ? perf_sched_cb_inc+0xc0/0xc0
[   64.105510]  ? syscall_exit_register+0x2a0/0x2a0
[   64.107359]  ? __switch_to+0x351/0x640
[   64.109285]  ? fsnotify+0x899/0x8f0
[   64.111610]  ? fsnotify_unmount_inodes+0x170/0x170
[   64.113876]  ? __fsnotify_update_child_dentry_flags+0x30/0x30
[   64.115813]  ? ring_buffer_record_is_on+0xd/0x20
[   64.117824]  ? __fget+0xa8/0xf0
[   64.119869]  vfs_write+0xf7/0x280
[   64.122001]  SyS_write+0xa1/0x120
[   64.124213]  ? SyS_read+0x120/0x120
[   64.126644]  ? SyS_read+0x120/0x120
[   64.128563]  do_syscall_64+0xeb/0x250
[   64.130732]  entry_SYSCALL_64_after_hwframe+0x21/0x86
[   64.132984] RIP: 0033:0x7f5c994ade99
[   64.135699] RSP: 002b:00007f5c99b97d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   64.138740] RAX: ffffffffffffffda RBX: 00000000200001e4 RCX: 00007f5c994ade99
[   64.141056] RDX: 00000000000000a0 RSI: 00000000200001c0 RDI: 0000000000000015
[   64.143536] RBP: 00007f5c99b97ec0 R08: 0000000000000000 R09: 0000000000000000
[   64.146017] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5c99b97fc0
[   64.148608] R13: 0000000000000000 R14: 00007fff660e1c40 R15: 00007f5c99b989c0
[   64.151060]
[   64.153703] Disabling lock debugging due to kernel taint
[   64.156032] BUG: unable to handle kernel NULL pointer dereference at 00000000000000b0
[   64.159066] IP: rdma_join_multicast+0x26e/0x12c0
[   64.161451] PGD 80000001d0298067 P4D 80000001d0298067 PUD 1dea39067 PMD 0
[   64.164442] Oops: 0000 [#1] SMP KASAN PTI
[   64.166817] CPU: 1 PID: 691 Comm: join Tainted: G    B 4.16.0-rc1-00219-gb97853b65b93 #23
[   64.170004] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.11.0-0-g63451fca13-prebuilt.qemu-proj4
[   64.174985] RIP: 0010:rdma_join_multicast+0x26e/0x12c0
[   64.177246] RSP: 0018:ffff8801c8207860 EFLAGS: 00010282
[   64.179901] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff94789522
[   64.183344] RDX: 1ffffffff2d50fa5 RSI: 0000000000000297 RDI: 0000000000000297
[   64.186237] RBP: ffff8801c8207a50 R08: 0000000000000000 R09: ffffed0039040ea7
[   64.189328] R10: 0000000000000001 R11: ffffed0039040ea6 R12: 0000000000000000
[   64.192634] R13: 0000000000000000 R14: ffff8801e2022800 R15: ffff8801d4ac2400
[   64.196105] FS:  00007f5c99b98700(0000) GS:ffff8801e5d00000(0000) knlGS:0000000000000000
[   64.199211] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   64.202046] CR2: 00000000000000b0 CR3: 00000001d1c48004 CR4: 00000000003606a0
[   64.205032] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   64.208221] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   64.211554] Call Trace:
[   64.213464]  ? rdma_disconnect+0xf0/0xf0
[   64.216124]  ? __radix_tree_replace+0xc3/0x110
[   64.219337]  ? node_tag_clear+0x81/0xb0
[   64.222140]  ? idr_alloc_u32+0x12e/0x1a0
[   64.224422]  ? __fprop_inc_percpu_max+0x150/0x150
[   64.226588]  ? tracing_record_taskinfo+0x10/0xc0
[   64.229763]  ? idr_alloc+0x76/0xc0
[   64.232186]  ? idr_alloc_u32+0x1a0/0x1a0
[   64.234505]  ? ucma_process_join+0x23d/0x460
[   64.237024]  ucma_process_join+0x23d/0x460
[   64.240076]  ? ucma_migrate_id+0x440/0x440
[   64.243284]  ? futex_wake+0x10b/0x2a0
[   64.245302]  ucma_join_multicast+0x88/0xe0
[   64.247783]  ? ucma_process_join+0x460/0x460
[   64.250841]  ? _copy_from_user+0x5e/0x90
[   64.253878]  ucma_write+0x174/0x1f0
[   64.257008]  ? ucma_resolve_route+0xf0/0xf0
[   64.259877]  ? rb_erase_cached+0x6c7/0x7f0
[   64.262746]  __vfs_write+0xc4/0x350
[   64.265537]  ? perf_syscall_enter+0xe4/0x5f0
[   64.267792]  ? kernel_read+0xa0/0xa0
[   64.270358]  ? perf_sched_cb_inc+0xc0/0xc0
[   64.272575]  ? syscall_exit_register+0x2a0/0x2a0
[   64.275367]  ? __switch_to+0x351/0x640
[   64.277700]  ? fsnotify+0x899/0x8f0
[   64.280530]  ? fsnotify_unmount_inodes+0x170/0x170
[   64.283156]  ? __fsnotify_update_child_dentry_flags+0x30/0x30
[   64.286182]  ? ring_buffer_record_is_on+0xd/0x20
[   64.288749]  ? __fget+0xa8/0xf0
[   64.291136]  vfs_write+0xf7/0x280
[   64.292972]  SyS_write+0xa1/0x120
[   64.294965]  ? SyS_read+0x120/0x120
[   64.297474]  ? SyS_read+0x120/0x120
[   64.299751]  do_syscall_64+0xeb/0x250
[   64.301826]  entry_SYSCALL_64_after_hwframe+0x21/0x86
[   64.304352] RIP: 0033:0x7f5c994ade99
[   64.306711] RSP: 002b:00007f5c99b97d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   64.309577] RAX: ffffffffffffffda RBX: 00000000200001e4 RCX: 00007f5c994ade99
[   64.312334] RDX: 00000000000000a0 RSI: 00000000200001c0 RDI: 0000000000000015
[   64.315783] RBP: 00007f5c99b97ec0 R08: 0000000000000000 R09: 0000000000000000
[   64.318365] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5c99b97fc0
[   64.320980] R13: 0000000000000000 R14: 00007fff660e1c40 R15: 00007f5c99b989c0
[   64.323515] Code: e8 e8 79 08 ff 4c 89 ff 45 0f b6 a7 b8 01 00 00 e8 68 7c 08 ff 49 8b 1f 4d 89 e5 49 c1 e4 04 48 8
[   64.330753] RIP: rdma_join_multicast+0x26e/0x12c0 RSP: ffff8801c8207860
[   64.332979] CR2: 00000000000000b0
[   64.335550] ---[ end trace 0c00c17a408849c1 ]---

Reported-by: <>
Fixes: c8f6a362bf3e ("RDMA/cma: Add multicast communication support")
Signed-off-by: Leon Romanovsky <>
Reviewed-by: Sean Hefty <>
Signed-off-by: Doug Ledford <>
4 years agoMerge tag 'platform-drivers-x86-v4.16-7' of git://
Linus Torvalds [Wed, 14 Mar 2018 20:01:14 +0000 (13:01 -0700)]
Merge tag 'platform-drivers-x86-v4.16-7' of git://

Pull x86 platform drives fixes from Darren Hart:

 - DELL_SMBIOS conditionally depends on ACPI_WMI in the same way it
   depends on DCDBAS, update the Kconfig accordingly.

 - fix the dell driver init order to ensure that the driver dependencies
   are met, avoiding race conditions resulting in boot failure on
   certain systems when the drivers are built-in.

* tag 'platform-drivers-x86-v4.16-7' of git://
  platform/x86: Fix dell driver init order
  platform/x86: dell-smbios: Resolve dependency error on ACPI_WMI

4 years agoRDMA/core: Do not use invalid destination in determining port reuse
Tatyana Nikolova [Mon, 12 Mar 2018 22:14:02 +0000 (17:14 -0500)]
RDMA/core: Do not use invalid destination in determining port reuse

cma_port_is_unique() allows local port reuse if the quad (source
address and port, destination address and port) for this connection
is unique. However, if the destination info is zero or unspecified, it
can't make a correct decision but still allows port reuse. For example,
sometimes rdma_bind_addr() is called with unspecified destination and
reusing the port can lead to creating a connection with a duplicate quad,
after the destination is resolved. The issue manifests when MPI scale-up
tests hang after the duplicate quad is used.

Set the destination address family and add checks for zero destination
address and port to prevent source port reuse based on invalid destination.

Fixes: 19b752a19dce ("IB/cma: Allow port reuse for rdma_id")
Reviewed-by: Sean Hefty <>
Signed-off-by: Tatyana Nikolova <>
Signed-off-by: Shiraz Saleem <>
Signed-off-by: Doug Ledford <>
4 years agodm mpath: fix passing integrity data
Steffen Maier [Wed, 14 Mar 2018 14:33:06 +0000 (15:33 +0100)]
dm mpath: fix passing integrity data

After v4.12 commit e2460f2a4bc7 ("dm: mark targets that pass integrity
data"), dm-multipath, e.g. on DIF+DIX SCSI disk paths, does not support
block integrity any more. So add it to the whitelist.

This is also a pre-requisite to use block integrity with other dm layer(s)
on top of multipath, such as kpartx partitions (dm-linear) or LVM.

Also, bump target version to reflect this fix.

Fixes: e2460f2a4bc7 ("dm: mark targets that pass integrity data")
Cc: <> #4.12+
Bisected-by: Fedor Loshakov <>
Signed-off-by: Steffen Maier <>
Reviewed-by: Hannes Reinecke <>
Reviewed-by: Martin K. Petersen <>
Signed-off-by: Mike Snitzer <>
4 years agoRDMA/mlx5: Fix crash while accessing garbage pointer and freed memory
Leon Romanovsky [Mon, 12 Mar 2018 19:26:37 +0000 (21:26 +0200)]
RDMA/mlx5: Fix crash while accessing garbage pointer and freed memory

The failure in rereg_mr flow caused to set garbage value (error value)
into mr->umem pointer. This pointer is accessed at the release stage
and it causes to the following crash.

There is not enough to simply change umem to point to NULL, because the
MR struct is needed to be accessed during MR deregistration phase, so
delay kfree too.

[    6.237617] BUG: unable to handle kernel NULL pointer dereference a 0000000000000228
[    6.238756] IP: ib_dereg_mr+0xd/0x30
[    6.239264] PGD 80000000167eb067 P4D 80000000167eb067 PUD 167f9067 PMD 0
[    6.240320] Oops: 0000 [#1] SMP PTI
[    6.240782] CPU: 0 PID: 367 Comm: dereg Not tainted 4.16.0-rc1-00029-gc198fafe0453 #183
[    6.242120] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 04/01/2014
[    6.244504] RIP: 0010:ib_dereg_mr+0xd/0x30
[    6.245253] RSP: 0018:ffffaf5d001d7d68 EFLAGS: 00010246
[    6.246100] RAX: 0000000000000000 RBX: ffff95d4172daf00 RCX: 0000000000000000
[    6.247414] RDX: 00000000ffffffff RSI: 0000000000000001 RDI: ffff95d41a317600
[    6.248591] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
[    6.249810] R10: ffff95d417033c10 R11: 0000000000000000 R12: ffff95d4172c3a80
[    6.251121] R13: ffff95d4172c3720 R14: ffff95d4172c3a98 R15: 00000000ffffffff
[    6.252437] FS:  0000000000000000(0000) GS:ffff95d41fc00000(0000) knlGS:0000000000000000
[    6.253887] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    6.254814] CR2: 0000000000000228 CR3: 00000000172b4000 CR4: 00000000000006b0
[    6.255943] Call Trace:
[    6.256368]  remove_commit_idr_uobject+0x1b/0x80
[    6.257118]  uverbs_cleanup_ucontext+0xe4/0x190
[    6.257855]  ib_uverbs_cleanup_ucontext.constprop.14+0x19/0x40
[    6.258857]  ib_uverbs_close+0x2a/0x100
[    6.259494]  __fput+0xca/0x1c0
[    6.259938]  task_work_run+0x84/0xa0
[    6.260519]  do_exit+0x312/0xb40
[    6.261023]  ? __do_page_fault+0x24d/0x490
[    6.261707]  do_group_exit+0x3a/0xa0
[    6.262267]  SyS_exit_group+0x10/0x10
[    6.262802]  do_syscall_64+0x75/0x180
[    6.263391]  entry_SYSCALL_64_after_hwframe+0x21/0x86
[    6.264253] RIP: 0033:0x7f1b39c49488
[    6.264827] RSP: 002b:00007ffe2de05b68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[    6.266049] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1b39c49488
[    6.267187] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[    6.268377] RBP: 00007f1b39f258e0 R08: 00000000000000e7 R09: ffffffffffffff98
[    6.269640] R10: 00007f1b3a147260 R11: 0000000000000246 R12: 00007f1b39f258e0
[    6.270783] R13: 00007f1b39f2ac20 R14: 0000000000000000 R15: 0000000000000000
[    6.271943] Code: 74 07 31 d2 e9 25 d8 6c 00 b8 da ff ff ff c3 0f 1f
44 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 8b 07 53 48 8b
5f 08 <48> 8b 80 28 02 00 00 e8 f7 d7 6c 00 85 c0 75 04 3e ff 4b 18 5b
[    6.274927] RIP: ib_dereg_mr+0xd/0x30 RSP: ffffaf5d001d7d68
[    6.275760] CR2: 0000000000000228
[    6.276200] ---[ end trace a35641f1c474bd20 ]---

Fixes: e126ba97dba9 ("mlx5: Add driver for Mellanox Connect-IB adapters")
Cc: syzkaller <>
Cc: <>
Reported-by: Noa Osherovich <>
Signed-off-by: Leon Romanovsky <>
Signed-off-by: Doug Ledford <>
4 years agox86/mm: Fix vmalloc_fault to use pXd_large
Toshi Kani [Tue, 13 Mar 2018 17:03:46 +0000 (11:03 -0600)]
x86/mm: Fix vmalloc_fault to use pXd_large

Gratian Crisan reported that vmalloc_fault() crashes when CONFIG_HUGETLBFS
is not set since the function inadvertently uses pXn_huge(), which always
return 0 in this case.  ioremap() does not depend on CONFIG_HUGETLBFS.

Fix vmalloc_fault() to call pXd_large() instead.

Fixes: f4eafd8bcd52 ("x86/mm: Fix vmalloc_fault() to handle large pages properly")
Reported-by: Gratian Crisan <>
Signed-off-by: Toshi Kani <>
Signed-off-by: Thomas Gleixner <>
Cc: Borislav Petkov <>
Cc: Andy Lutomirski <>
4 years agoRDMAVT: Fix synchronization around percpu_ref
Tejun Heo [Wed, 14 Mar 2018 19:10:18 +0000 (12:10 -0700)]
RDMAVT: Fix synchronization around percpu_ref

rvt_mregion uses percpu_ref for reference counting and RCU to protect
accesses from lkey_table.  When a rvt_mregion needs to be freed, it
first gets unregistered from lkey_table and then rvt_check_refs() is
called to wait for in-flight usages before the rvt_mregion is freed.

rvt_check_refs() seems to have a couple issues.

* It has a fast exit path which tests percpu_ref_is_zero().  However,
  a percpu_ref reading zero doesn't mean that the object can be
  released.  In fact, the ->release() callback might not even have
  started executing yet.  Proceeding with freeing can lead to

* lkey_table is RCU protected but there is no RCU grace period in the
  free path.  percpu_ref uses RCU internally but it's sched-RCU whose
  grace periods are different from regular RCU.  Also, it generally
  isn't a good idea to depend on internal behaviors like this.

To address the above issues, this patch removes the fast exit and adds
an explicit synchronize_rcu().

Signed-off-by: Tejun Heo <>
Acked-by: Dennis Dalessandro <>
Cc: Mike Marciniszyn <>
Cc: Linus Torvalds <>
4 years agofs/aio: Use RCU accessors for kioctx_table->table[]
Tejun Heo [Wed, 14 Mar 2018 19:10:17 +0000 (12:10 -0700)]
fs/aio: Use RCU accessors for kioctx_table->table[]

While converting ioctx index from a list to a table, db446a08c23d
("aio: convert the ioctx list to table lookup v3") missed tagging
kioctx_table->table[] as an array of RCU pointers and using the
appropriate RCU accessors.  This introduces a small window in the
lookup path where init and access may race.

Mark kioctx_table->table[] with __rcu and use the approriate RCU
accessors when using the field.

Signed-off-by: Tejun Heo <>
Reported-by: Jann Horn <>
Fixes: db446a08c23d ("aio: convert the ioctx list to table lookup v3")
Cc: Benjamin LaHaise <>
Cc: Linus Torvalds <>
Cc: # v3.12+
4 years agofs/aio: Add explicit RCU grace period when freeing kioctx
Tejun Heo [Wed, 14 Mar 2018 19:10:17 +0000 (12:10 -0700)]
fs/aio: Add explicit RCU grace period when freeing kioctx

While fixing refcounting, e34ecee2ae79 ("aio: Fix a trinity splat")
incorrectly removed explicit RCU grace period before freeing kioctx.
The intention seems to be depending on the internal RCU grace periods
of percpu_ref; however, percpu_ref uses a different flavor of RCU,
sched-RCU.  This can lead to kioctx being freed while RCU read
protected dereferences are still in progress.

Fix it by updating free_ioctx() to go through call_rcu() explicitly.

v2: Comment added to explain double bouncing.

Signed-off-by: Tejun Heo <>
Reported-by: Jann Horn <>
Fixes: e34ecee2ae79 ("aio: Fix a trinity splat")
Cc: Kent Overstreet <>
Cc: Linus Torvalds <>
Cc: # v3.13+
4 years agokvm: arm/arm64: vgic-v3: Tighten synchronization for guests using v2 on v3
Marc Zyngier [Tue, 6 Mar 2018 21:44:37 +0000 (21:44 +0000)]
kvm: arm/arm64: vgic-v3: Tighten synchronization for guests using v2 on v3

On guest exit, and when using GICv2 on GICv3, we use a dsb(st) to
force synchronization between the memory-mapped guest view and
the system-register view that the hypervisor uses.

This is incorrect, as the spec calls out the need for "a DSB whose
required access type is both loads and stores with any Shareability
attribute", while we're only synchronizing stores.

We also lack an isb after the dsb to ensure that the latter has
actually been executed before we start reading stuff from the sysregs.

The fix is pretty easy: turn dsb(st) into dsb(sy), and slap an isb()
just after.

Fixes: f68d2b1b73cc ("arm64: KVM: Implement vgic-v3 save/restore")
Acked-by: Christoffer Dall <>
Reviewed-by: Andre Przywara <>
Signed-off-by: Marc Zyngier <>
4 years agoKVM: arm/arm64: vgic: Don't populate multiple LRs with the same vintid
Marc Zyngier [Tue, 6 Mar 2018 21:48:01 +0000 (21:48 +0000)]
KVM: arm/arm64: vgic: Don't populate multiple LRs with the same vintid

The vgic code is trying to be clever when injecting GICv2 SGIs,
and will happily populate LRs with the same interrupt number if
they come from multiple vcpus (after all, they are distinct
interrupt sources).

Unfortunately, this is against the letter of the architecture,
and the GICv2 architecture spec says "Each valid interrupt stored
in the List registers must have a unique VirtualID for that
virtual CPU interface.". GICv3 has similar (although slightly
ambiguous) restrictions.

This results in guests locking up when using GICv2-on-GICv3, for
example. The obvious fix is to stop trying so hard, and inject
a single vcpu per SGI per guest entry. After all, pending SGIs
with multiple source vcpus are pretty rare, and are mostly seen
in scenario where the physical CPUs are severely overcomitted.

But as we now only inject a single instance of a multi-source SGI per
vcpu entry, we may delay those interrupts for longer than strictly
necessary, and run the risk of injecting lower priority interrupts
in the meantime.

In order to address this, we adopt a three stage strategy:
- If we encounter a multi-source SGI in the AP list while computing
  its depth, we force the list to be sorted
- When populating the LRs, we prevent the injection of any interrupt
  of lower priority than that of the first multi-source SGI we've
- Finally, the injection of a multi-source SGI triggers the request
  of a maintenance interrupt when there will be no pending interrupt
  in the LRs (HCR_NPIE).

At the point where the last pending interrupt in the LRs switches
from Pending to Active, the maintenance interrupt will be delivered,
allowing us to add the remaining SGIs using the same process.

Fixes: 0919e84c0fc1 ("KVM: arm/arm64: vgic-new: Add IRQ sync/flush framework")
Acked-by: Christoffer Dall <>
Signed-off-by: Marc Zyngier <>
4 years agoKVM: arm/arm64: Reduce verbosity of KVM init log
Ard Biesheuvel [Fri, 2 Mar 2018 08:16:30 +0000 (08:16 +0000)]
KVM: arm/arm64: Reduce verbosity of KVM init log

On my GICv3 system, the following is printed to the kernel log at boot:

   kvm [1]: 8-bit VMID
   kvm [1]: IDMAP page: d20e35000
   kvm [1]: HYP VA range: 800000000000:ffffffffffff
   kvm [1]: vgic-v2@2c020000
   kvm [1]: GIC system register CPU interface enabled
   kvm [1]: vgic interrupt IRQ1
   kvm [1]: virtual timer IRQ4
   kvm [1]: Hyp mode initialized successfully

The KVM IDMAP is a mapping of a statically allocated kernel structure,
and so printing its physical address leaks the physical placement of
the kernel when physical KASLR in effect. So change the kvm_info() to
kvm_debug() to remove it from the log output.

While at it, trim the output a bit more: IRQ numbers can be found in
/proc/interrupts, and the HYP VA and vgic-v2 lines are not highly
informational either.

Cc: <>
Acked-by: Will Deacon <>
Acked-by: Christoffer Dall <>
Signed-off-by: Ard Biesheuvel <>
Signed-off-by: Marc Zyngier <>
4 years agoKVM: arm/arm64: Reset mapped IRQs on VM reset
Christoffer Dall [Mon, 5 Mar 2018 10:36:38 +0000 (11:36 +0100)]
KVM: arm/arm64: Reset mapped IRQs on VM reset

We currently don't allow resetting mapped IRQs from userspace, because
their state is controlled by the hardware.  But we do need to reset the
state when the VM is reset, so we provide a function for the 'owner' of
the mapped interrupt to reset the interrupt state.

Currently only the timer uses mapped interrupts, so we call this
function from the timer reset logic.

Fixes: 4c60e360d6df ("KVM: arm/arm64: Provide a get_input_level for the arch timer")
Signed-off-by: Christoffer Dall <>
Signed-off-by: Marc Zyngier <>
4 years agoKVM: arm/arm64: Avoid vcpu_load for other vcpu ioctls than KVM_RUN
Christoffer Dall [Tue, 27 Feb 2018 11:33:50 +0000 (12:33 +0100)]
KVM: arm/arm64: Avoid vcpu_load for other vcpu ioctls than KVM_RUN

Calling vcpu_load() registers preempt notifiers for this vcpu and calls
kvm_arch_vcpu_load().  The latter will soon be doing a lot of heavy
lifting on arm/arm64 and will try to do things such as enabling the
virtual timer and setting us up to handle interrupts from the timer

Loading state onto hardware registers and enabling hardware to signal
interrupts can be problematic when we're not actually about to run the
VCPU, because it makes it difficult to establish the right context when
handling interrupts from the timer, and it makes the register access
code difficult to reason about.

Luckily, now when we call vcpu_load in each ioctl implementation, we can
simply remove the call from the non-KVM_RUN vcpu ioctls, and our
kvm_arch_vcpu_load() is only used for loading vcpu content to the
physical CPU when we're actually going to run the vcpu.

Fixes: 9b062471e52a ("KVM: Move vcpu_load to arch-specific kvm_arch_vcpu_ioctl")
Reviewed-by: Julien Grall <>
Reviewed-by: Marc Zyngier <>
Reviewed-by: Andrew Jones <>
Signed-off-by: Christoffer Dall <>
Signed-off-by: Marc Zyngier <>
4 years agoKVM: arm/arm64: vgic: Add missing irq_lock to vgic_mmio_read_pending
Andre Przywara [Tue, 6 Mar 2018 09:21:06 +0000 (09:21 +0000)]
KVM: arm/arm64: vgic: Add missing irq_lock to vgic_mmio_read_pending

Our irq_is_pending() helper function accesses multiple members of the
vgic_irq struct, so we need to hold the lock when calling it.
Add that requirement as a comment to the definition and take the lock
around the call in vgic_mmio_read_pending(), where we were missing it

Fixes: 96b298000db4 ("KVM: arm/arm64: vgic-new: Add PENDING registers handlers")
Signed-off-by: Andre Przywara <>
Signed-off-by: Marc Zyngier <>