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authorAnshuman Khandual <khandual@linux.vnet.ibm.com>2017-09-08 16:12:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-08 18:26:47 -0700
commitfde26bed588918a11831841b219f74b20b32b080 (patch)
treeecbd7594f122ccd61572430616863592ddc7ef28 /mm
parent656710a60e3693911bee3a355d2f2bbae3faba33 (diff)
download96b-common-fde26bed588918a11831841b219f74b20b32b080.tar.gz
mm/memory.c: remove reduntant check for write access
Flags argument has been copied into vmf.flags and it is not changed in between. Hence a single write access check can be used for both PUD and PMD. Link: http://lkml.kernel.org/r/20170823082839.1812-1-khandual@linux.vnet.ibm.com Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memory.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/mm/memory.c b/mm/memory.c
index ad0ea1af1f44..7c521a6ec7c6 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3961,6 +3961,7 @@ static int __handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
.pgoff = linear_page_index(vma, address),
.gfp_mask = __get_fault_gfp_mask(vma),
};
+ unsigned int dirty = flags & FAULT_FLAG_WRITE;
struct mm_struct *mm = vma->vm_mm;
pgd_t *pgd;
p4d_t *p4d;
@@ -3983,7 +3984,6 @@ static int __handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
barrier();
if (pud_trans_huge(orig_pud) || pud_devmap(orig_pud)) {
- unsigned int dirty = flags & FAULT_FLAG_WRITE;
/* NUMA case for anonymous PUDs would go here */
@@ -4020,8 +4020,7 @@ static int __handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
if (pmd_protnone(orig_pmd) && vma_is_accessible(vma))
return do_huge_pmd_numa_page(&vmf, orig_pmd);
- if ((vmf.flags & FAULT_FLAG_WRITE) &&
- !pmd_write(orig_pmd)) {
+ if (dirty && !pmd_write(orig_pmd)) {
ret = wp_huge_pmd(&vmf, orig_pmd);
if (!(ret & VM_FAULT_FALLBACK))
return ret;