Merge branches 'acpi-tables', 'acpi-osl', 'acpi-misc' and 'acpi-tools'
[linux-2.6-microblaze.git] / include / linux / khugepaged.h
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
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);
14 extern int __khugepaged_enter(struct mm_struct *mm);
15 extern void __khugepaged_exit(struct mm_struct *mm);
16 extern 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
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
46 static 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 */
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 }
66 static inline int khugepaged_enter(struct vm_area_struct *vma,
67                                    unsigned long vm_flags)
68 {
69         return 0;
70 }
71 static 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 */