hugetlb: introduce generic version of huge_ptep_get_and_clear()
[muen/linux.git] / arch / x86 / include / asm / hugetlb.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_HUGETLB_H
3 #define _ASM_X86_HUGETLB_H
4
5 #include <asm/page.h>
6 #include <asm-generic/hugetlb.h>
7
8 #define hugepages_supported() boot_cpu_has(X86_FEATURE_PSE)
9
10 static inline int is_hugepage_only_range(struct mm_struct *mm,
11                                          unsigned long addr,
12                                          unsigned long len) {
13         return 0;
14 }
15
16 /*
17  * If the arch doesn't supply something else, assume that hugepage
18  * size aligned regions are ok without further preparation.
19  */
20 static inline int prepare_hugepage_range(struct file *file,
21                         unsigned long addr, unsigned long len)
22 {
23         struct hstate *h = hstate_file(file);
24         if (len & ~huge_page_mask(h))
25                 return -EINVAL;
26         if (addr & ~huge_page_mask(h))
27                 return -EINVAL;
28         return 0;
29 }
30
31 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
32                                          unsigned long addr, pte_t *ptep)
33 {
34         ptep_clear_flush(vma, addr, ptep);
35 }
36
37 static inline int huge_pte_none(pte_t pte)
38 {
39         return pte_none(pte);
40 }
41
42 static inline pte_t huge_pte_wrprotect(pte_t pte)
43 {
44         return pte_wrprotect(pte);
45 }
46
47 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
48                                            unsigned long addr, pte_t *ptep)
49 {
50         ptep_set_wrprotect(mm, addr, ptep);
51 }
52
53 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
54                                              unsigned long addr, pte_t *ptep,
55                                              pte_t pte, int dirty)
56 {
57         return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
58 }
59
60 static inline pte_t huge_ptep_get(pte_t *ptep)
61 {
62         return *ptep;
63 }
64
65 static inline void arch_clear_hugepage_flags(struct page *page)
66 {
67 }
68
69 #ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE
70 static inline bool gigantic_page_supported(void) { return true; }
71 #endif
72
73 #endif /* _ASM_X86_HUGETLB_H */