pgtable_uffd.h

 1#ifndef _ASM_GENERIC_PGTABLE_UFFD_H
 2#define _ASM_GENERIC_PGTABLE_UFFD_H
 3
 4/*
 5 * Some platforms can customize the uffd-wp bit, making it unavailable
 6 * even if the architecture provides the resource.
 7 * Adding this API allows architectures to add their own checks for the
 8 * devices on which the kernel is running.
 9 * Note: When overriding it, please make sure the
10 * CONFIG_HAVE_ARCH_USERFAULTFD_WP is part of this macro.
11 */
12#ifndef pgtable_supports_uffd_wp
13#define pgtable_supports_uffd_wp()	IS_ENABLED(CONFIG_HAVE_ARCH_USERFAULTFD_WP)
14#endif
15
16static inline bool uffd_supports_wp_marker(void)
17{
18	return pgtable_supports_uffd_wp() && IS_ENABLED(CONFIG_PTE_MARKER_UFFD_WP);
19}
20
21#ifndef CONFIG_HAVE_ARCH_USERFAULTFD_WP
22static __always_inline int pte_uffd_wp(pte_t pte)
23{
24	return 0;
25}
26
27static __always_inline int pmd_uffd_wp(pmd_t pmd)
28{
29	return 0;
30}
31
32static __always_inline pte_t pte_mkuffd_wp(pte_t pte)
33{
34	return pte;
35}
36
37static __always_inline pmd_t pmd_mkuffd_wp(pmd_t pmd)
38{
39	return pmd;
40}
41
42static __always_inline pte_t pte_clear_uffd_wp(pte_t pte)
43{
44	return pte;
45}
46
47static __always_inline pmd_t pmd_clear_uffd_wp(pmd_t pmd)
48{
49	return pmd;
50}
51
52static __always_inline pte_t pte_swp_mkuffd_wp(pte_t pte)
53{
54	return pte;
55}
56
57static __always_inline int pte_swp_uffd_wp(pte_t pte)
58{
59	return 0;
60}
61
62static __always_inline pte_t pte_swp_clear_uffd_wp(pte_t pte)
63{
64	return pte;
65}
66
67static inline pmd_t pmd_swp_mkuffd_wp(pmd_t pmd)
68{
69	return pmd;
70}
71
72static inline int pmd_swp_uffd_wp(pmd_t pmd)
73{
74	return 0;
75}
76
77static inline pmd_t pmd_swp_clear_uffd_wp(pmd_t pmd)
78{
79	return pmd;
80}
81#endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
82
83#endif /* _ASM_GENERIC_PGTABLE_UFFD_H */