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| author | Anshuman Khandual <anshuman.khandual@arm.com> | 2022-04-28 23:16:12 -0700 |
|---|---|---|
| committer | akpm <akpm@linux-foundation.org> | 2022-04-28 23:16:12 -0700 |
| commit | 6c862bd05922af770c5b652037404c4f8131d984 (patch) | |
| tree | 5669ac63de3de972d5166f8ee2d60b10142b679d /mm/mmap.c | |
| parent | 31d17076b07c8ed212b1d865b36b0c7313885ef2 (diff) | |
| download | linux-6c862bd05922af770c5b652037404c4f8131d984.tar.gz linux-6c862bd05922af770c5b652037404c4f8131d984.tar.bz2 linux-6c862bd05922af770c5b652037404c4f8131d984.zip | |
mm/mmap: clarify protection_map[] indices
protection_map[] maps vm_flags access combinations into page protection
value as defined by the platform via __PXXX and __SXXX macros. The array
indices in protection_map[], represents vm_flags access combinations but
it's not very intuitive to derive. This makes it clear and explicit.
Link: https://lkml.kernel.org/r/20220404031840.588321-3-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 042f01ec02fe..7873cc3ca24c 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -102,8 +102,22 @@ static void unmap_region(struct mm_struct *mm, * x: (yes) yes */ pgprot_t protection_map[16] __ro_after_init = { - __P000, __P001, __P010, __P011, __P100, __P101, __P110, __P111, - __S000, __S001, __S010, __S011, __S100, __S101, __S110, __S111 + [VM_NONE] = __P000, + [VM_READ] = __P001, + [VM_WRITE] = __P010, + [VM_WRITE | VM_READ] = __P011, + [VM_EXEC] = __P100, + [VM_EXEC | VM_READ] = __P101, + [VM_EXEC | VM_WRITE] = __P110, + [VM_EXEC | VM_WRITE | VM_READ] = __P111, + [VM_SHARED] = __S000, + [VM_SHARED | VM_READ] = __S001, + [VM_SHARED | VM_WRITE] = __S010, + [VM_SHARED | VM_WRITE | VM_READ] = __S011, + [VM_SHARED | VM_EXEC] = __S100, + [VM_SHARED | VM_EXEC | VM_READ] = __S101, + [VM_SHARED | VM_EXEC | VM_WRITE] = __S110, + [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __S111 }; #ifndef CONFIG_ARCH_HAS_FILTER_PGPROT |