From 5fdca13c18dbab4ec6fd7ceed9d5c8b853beecbc Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Wed, 19 Jun 2013 10:05:56 +1000 Subject: [PATCH] mm/thp: use the correct function when updating access flags We should use pmdp_set_access_flags to update access flags. Archs like powerpc use extra checks(_PAGE_BUSY) when updating a hugepage PTE. A set_pmd_at doesn't do those checks. We should use set_pmd_at only when updating a none hugepage PTE. Signed-off-by: Aneesh Kumar K.V Cc: Andrea Arcangeli a Signed-off-by: Andrew Morton --- mm/huge_memory.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index d8b3b850150c..4347eb3a00ff 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1265,7 +1265,9 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma, * young bit, instead of the current set_pmd_at. */ _pmd = pmd_mkyoung(pmd_mkdirty(*pmd)); - set_pmd_at(mm, addr & HPAGE_PMD_MASK, pmd, _pmd); + if (pmdp_set_access_flags(vma, addr & HPAGE_PMD_MASK, + pmd, _pmd, 1)) + update_mmu_cache_pmd(vma, addr, pmd); } if ((flags & FOLL_MLOCK) && (vma->vm_flags & VM_LOCKED)) { if (page->mapping && trylock_page(page)) { -- 2.39.5