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| author | Anshuman Khandual <anshuman.khandual@arm.com> | 2020-04-10 14:33:09 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-04-10 15:36:21 -0700 |
| commit | 6cb4d9a2870d2062e34c93bfef4d52fca3fe42d1 (patch) | |
| tree | 320b55ec93c786f01132532c8e8c19d192fb1473 /include/linux/mm.h | |
| parent | c62da0c35d58518ddb26ff641d2485596567fd96 (diff) | |
| download | lwn-6cb4d9a2870d2062e34c93bfef4d52fca3fe42d1.tar.gz lwn-6cb4d9a2870d2062e34c93bfef4d52fca3fe42d1.zip | |
mm/vma: introduce VM_ACCESS_FLAGS
There are many places where all basic VMA access flags (read, write,
exec) are initialized or checked against as a group. One such example
is during page fault. Existing vma_is_accessible() wrapper already
creates the notion of VMA accessibility as a group access permissions.
Hence lets just create VM_ACCESS_FLAGS (VM_READ|VM_WRITE|VM_EXEC) which
will not only reduce code duplication but also extend the VMA
accessibility concept in general.
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Rob Springer <rspringer@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Link: http://lkml.kernel.org/r/1583391014-8170-3-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mm.h')
| -rw-r--r-- | include/linux/mm.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 33076fa149c8..4db1522d7c48 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -369,6 +369,10 @@ extern unsigned int kobjsize(const void *objp); #define VM_STACK_FLAGS (VM_STACK | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) +/* VMA basic access permission flags */ +#define VM_ACCESS_FLAGS (VM_READ | VM_WRITE | VM_EXEC) + + /* * Special vmas that are non-mergable, non-mlock()able. */ @@ -646,7 +650,7 @@ static inline bool vma_is_foreign(struct vm_area_struct *vma) static inline bool vma_is_accessible(struct vm_area_struct *vma) { - return vma->vm_flags & (VM_READ | VM_WRITE | VM_EXEC); + return vma->vm_flags & VM_ACCESS_FLAGS; } #ifdef CONFIG_SHMEM |