diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mm.h | 60 | ||||
| -rw-r--r-- | include/linux/mm_types.h | 8 |
2 files changed, 59 insertions, 9 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 16a1ad9a3397..7954a7a2b811 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1049,6 +1049,19 @@ static __always_inline vma_flags_t __mk_vma_flags(size_t count, } /* + * Helper macro which bitwise-or combines the specified input flags into a + * vma_flags_t bitmap value. E.g.: + * + * vma_flags_t flags = mk_vma_flags(VMA_IO_BIT, VMA_PFNMAP_BIT, + * VMA_DONTEXPAND_BIT, VMA_DONTDUMP_BIT); + * + * The compiler cleverly optimises away all of the work and this ends up being + * equivalent to aggregating the values manually. + */ +#define mk_vma_flags(...) __mk_vma_flags(COUNT_ARGS(__VA_ARGS__), \ + (const vma_flag_t []){__VA_ARGS__}) + +/* * Test whether a specific VMA flag is set, e.g.: * * if (vma_flags_test(flags, VMA_READ_BIT)) { ... } @@ -1062,17 +1075,30 @@ static __always_inline bool vma_flags_test(const vma_flags_t *flags, } /* - * Helper macro which bitwise-or combines the specified input flags into a - * vma_flags_t bitmap value. E.g.: - * - * vma_flags_t flags = mk_vma_flags(VMA_IO_BIT, VMA_PFNMAP_BIT, - * VMA_DONTEXPAND_BIT, VMA_DONTDUMP_BIT); + * Obtain a set of VMA flags which contain the overlapping flags contained + * within flags and to_and. + */ +static __always_inline vma_flags_t vma_flags_and_mask(const vma_flags_t *flags, + vma_flags_t to_and) +{ + vma_flags_t dst; + unsigned long *bitmap_dst = dst.__vma_flags; + const unsigned long *bitmap = flags->__vma_flags; + const unsigned long *bitmap_to_and = to_and.__vma_flags; + + bitmap_and(bitmap_dst, bitmap, bitmap_to_and, NUM_VMA_FLAG_BITS); + return dst; +} + +/* + * Obtain a set of VMA flags which contains the specified overlapping flags, + * e.g.: * - * The compiler cleverly optimises away all of the work and this ends up being - * equivalent to aggregating the values manually. + * vma_flags_t read_flags = vma_flags_and(&flags, VMA_READ_BIT, + * VMA_MAY_READ_BIT); */ -#define mk_vma_flags(...) __mk_vma_flags(COUNT_ARGS(__VA_ARGS__), \ - (const vma_flag_t []){__VA_ARGS__}) +#define vma_flags_and(flags, ...) \ + vma_flags_and_mask(flags, mk_vma_flags(__VA_ARGS__)) /* Test each of to_test flags in flags, non-atomically. */ static __always_inline bool vma_flags_test_any_mask(const vma_flags_t *flags, @@ -1147,6 +1173,22 @@ static __always_inline void vma_flags_clear_mask(vma_flags_t *flags, vma_flags_clear_mask(flags, mk_vma_flags(__VA_ARGS__)) /* + * Obtain a VMA flags value containing those flags that are present in flags or + * flags_other but not in both. + */ +static __always_inline vma_flags_t vma_flags_diff_pair(const vma_flags_t *flags, + const vma_flags_t *flags_other) +{ + vma_flags_t dst; + const unsigned long *bitmap_other = flags_other->__vma_flags; + const unsigned long *bitmap = flags->__vma_flags; + unsigned long *bitmap_dst = dst.__vma_flags; + + bitmap_xor(bitmap_dst, bitmap, bitmap_other, NUM_VMA_FLAG_BITS); + return dst; +} + +/* * Helper to test that ALL specified flags are set in a VMA. * * Note: appropriate locks must be held, this function does not acquire them for diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index f22aecb047b7..321aa150c1ee 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -870,6 +870,14 @@ typedef struct { #define EMPTY_VMA_FLAGS ((vma_flags_t){ }) +/* Are no flags set in the specified VMA flags? */ +static __always_inline bool vma_flags_empty(const vma_flags_t *flags) +{ + const unsigned long *bitmap = flags->__vma_flags; + + return bitmap_empty(bitmap, NUM_VMA_FLAG_BITS); +} + /* * Describes a VMA that is about to be mmap()'ed. Drivers may choose to * manipulate mutable fields which will cause those fields to be updated in the |