xref: /linux/include/asm-generic/pgtable_uffd.h (revision 7203ca412fc8e8a0588e9adc0f777d3163f8dff3) 
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 
uffd_supports_wp_marker(void)16 static 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
pte_uffd_wp(pte_t pte)22 static __always_inline int pte_uffd_wp(pte_t pte)
23 {
24 	return 0;
25 }
26 
pmd_uffd_wp(pmd_t pmd)27 static __always_inline int pmd_uffd_wp(pmd_t pmd)
28 {
29 	return 0;
30 }
31 
pte_mkuffd_wp(pte_t pte)32 static __always_inline pte_t pte_mkuffd_wp(pte_t pte)
33 {
34 	return pte;
35 }
36 
pmd_mkuffd_wp(pmd_t pmd)37 static __always_inline pmd_t pmd_mkuffd_wp(pmd_t pmd)
38 {
39 	return pmd;
40 }
41 
pte_clear_uffd_wp(pte_t pte)42 static __always_inline pte_t pte_clear_uffd_wp(pte_t pte)
43 {
44 	return pte;
45 }
46 
pmd_clear_uffd_wp(pmd_t pmd)47 static __always_inline pmd_t pmd_clear_uffd_wp(pmd_t pmd)
48 {
49 	return pmd;
50 }
51 
pte_swp_mkuffd_wp(pte_t pte)52 static __always_inline pte_t pte_swp_mkuffd_wp(pte_t pte)
53 {
54 	return pte;
55 }
56 
pte_swp_uffd_wp(pte_t pte)57 static __always_inline int pte_swp_uffd_wp(pte_t pte)
58 {
59 	return 0;
60 }
61 
pte_swp_clear_uffd_wp(pte_t pte)62 static __always_inline pte_t pte_swp_clear_uffd_wp(pte_t pte)
63 {
64 	return pte;
65 }
66 
pmd_swp_mkuffd_wp(pmd_t pmd)67 static inline pmd_t pmd_swp_mkuffd_wp(pmd_t pmd)
68 {
69 	return pmd;
70 }
71 
pmd_swp_uffd_wp(pmd_t pmd)72 static inline int pmd_swp_uffd_wp(pmd_t pmd)
73 {
74 	return 0;
75 }
76 
pmd_swp_clear_uffd_wp(pmd_t pmd)77 static 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 */
84