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| author | Anshuman Khandual <khandual@linux.vnet.ibm.com> | 2017-09-08 16:12:45 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-08 18:26:47 -0700 |
| commit | fde26bed588918a11831841b219f74b20b32b080 (patch) | |
| tree | ecbd7594f122ccd61572430616863592ddc7ef28 /mm/memory.c | |
| parent | 656710a60e3693911bee3a355d2f2bbae3faba33 (diff) | |
| download | lwn-fde26bed588918a11831841b219f74b20b32b080.tar.gz lwn-fde26bed588918a11831841b219f74b20b32b080.zip | |
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/memory.c')
| -rw-r--r-- | mm/memory.c | 5 |
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; |