1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_KHUGEPAGED_H
3#define _LINUX_KHUGEPAGED_H
4
5#include <linux/sched/coredump.h> /* MMF_VM_HUGEPAGE */
6
7
8#ifdef CONFIG_TRANSPARENT_HUGEPAGE
9extern struct attribute_group khugepaged_attr_group;
10
11extern int khugepaged_init(void);
12extern void khugepaged_destroy(void);
13extern int start_stop_khugepaged(void);
14extern int __khugepaged_enter(struct mm_struct *mm);
15extern void __khugepaged_exit(struct mm_struct *mm);
16extern int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
17 unsigned long vm_flags);
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
33static 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
40static inline void khugepaged_exit(struct mm_struct *mm)
41{
42 if (test_bit(MMF_VM_HUGEPAGE, &mm->flags))
43 __khugepaged_exit(mm);
44}
45
46static inline int khugepaged_enter(struct vm_area_struct *vma,
47 unsigned long vm_flags)
48{
49 if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags))
50 if ((khugepaged_always() ||
51 (khugepaged_req_madv() && (vm_flags & VM_HUGEPAGE))) &&
52 !(vm_flags & VM_NOHUGEPAGE) &&
53 !test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags))
54 if (__khugepaged_enter(vma->vm_mm))
55 return -ENOMEM;
56 return 0;
57}
58#else /* CONFIG_TRANSPARENT_HUGEPAGE */
59static inline int khugepaged_fork(struct mm_struct *mm, struct mm_struct *oldmm)
60{
61 return 0;
62}
63static inline void khugepaged_exit(struct mm_struct *mm)
64{
65}
66static inline int khugepaged_enter(struct vm_area_struct *vma,
67 unsigned long vm_flags)
68{
69 return 0;
70}
71static inline int khugepaged_enter_vma_merge(struct vm_area_struct *vma,
72 unsigned long vm_flags)
73{
74 return 0;
75}
76#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
77
78#endif /* _LINUX_KHUGEPAGED_H */
79