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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
ba76149f AA |
2 | #ifndef _LINUX_KHUGEPAGED_H |
3 | #define _LINUX_KHUGEPAGED_H | |
4 | ||
f7ccbae4 IM |
5 | #include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */ |
6 | ||
ba76149f AA |
7 | |
8 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE | |
b46e756f KS |
9 | extern struct attribute_group khugepaged_attr_group; |
10 | ||
11 | extern int khugepaged_init(void); | |
12 | extern void khugepaged_destroy(void); | |
13 | extern int start_stop_khugepaged(void); | |
ba76149f AA |
14 | extern int __khugepaged_enter(struct mm_struct *mm); |
15 | extern void __khugepaged_exit(struct mm_struct *mm); | |
6d50e60c DR |
16 | extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma, |
17 | unsigned long vm_flags); | |
ba76149f AA |
18 | |
19 | #define khugepaged_enabled() \ | |
20 | (transparent_hugepage_flags & \ | |
21 | ((1<<TRANSPARENT_HUGEPAGE_FLAG) | \ | |
22 | (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG))) | |
23 | #define khugepaged_always() \ | |
24 | (transparent_hugepage_flags & \ | |
25 | (1<<TRANSPARENT_HUGEPAGE_FLAG)) | |
26 | #define khugepaged_req_madv() \ | |
27 | (transparent_hugepage_flags & \ | |
28 | (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)) | |
29 | #define khugepaged_defrag() \ | |
30 | (transparent_hugepage_flags & \ | |
31 | (1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG)) | |
32 | ||
33 | static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm) | |
34 | { | |
35 | if (test_bit(MMF_VM_HUGEPAGE, &oldmm->flags)) | |
36 | return __khugepaged_enter(mm); | |
37 | return 0; | |
38 | } | |
39 | ||
40 | static inline void khugepaged_exit(struct mm_struct *mm) | |
41 | { | |
42 | if (test_bit(MMF_VM_HUGEPAGE, &mm->flags)) | |
43 | __khugepaged_exit(mm); | |
44 | } | |
45 | ||
6d50e60c DR |
46 | static inline int khugepaged_enter(struct vm_area_struct *vma, |
47 | unsigned long vm_flags) | |
ba76149f AA |
48 | { |
49 | if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags)) | |
a664b2d8 | 50 | if ((khugepaged_always() || |
6d50e60c | 51 | (khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) && |
18600332 MH |
52 | !(vm_flags & VM_NOHUGEPAGE) && |
53 | !test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags)) | |
ba76149f AA |
54 | if (__khugepaged_enter(vma->vm_mm)) |
55 | return -ENOMEM; | |
56 | return 0; | |
57 | } | |
58 | #else /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
59 | static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm) | |
60 | { | |
61 | return 0; | |
62 | } | |
63 | static inline void khugepaged_exit(struct mm_struct *mm) | |
64 | { | |
65 | } | |
6d50e60c DR |
66 | static inline int khugepaged_enter(struct vm_area_struct *vma, |
67 | unsigned long vm_flags) | |
ba76149f AA |
68 | { |
69 | return 0; | |
70 | } | |
6d50e60c DR |
71 | static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma, |
72 | unsigned long vm_flags) | |
ba76149f AA |
73 | { |
74 | return 0; | |
75 | } | |
76 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
77 | ||
78 | #endif /* _LINUX_KHUGEPAGED_H */ |