From: Anshuman Khandual Date: Fri, 8 Sep 2017 23:12:45 +0000 (-0700) Subject: mm/memory.c: remove reduntant check for write access X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=fde26bed588918a11831841b219f74b20b32b080;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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;