From 1667918b6483b12a6496bf54151b827b8235d7b1 Mon Sep 17 00:00:00 2001 From: Mel Gorman Date: Wed, 18 Dec 2013 17:08:41 -0800 Subject: mm: numa: clear numa hinting information on mprotect On a protection change it is no longer clear if the page should be still accessible. This patch clears the NUMA hinting fault bits on a protection change. Signed-off-by: Mel Gorman Reviewed-by: Rik van Riel Cc: Alex Thorlton Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/huge_memory.c | 2 ++ mm/mprotect.c | 2 ++ 2 files changed, 4 insertions(+) (limited to 'mm') diff --git a/mm/huge_memory.c b/mm/huge_memory.c index dbafffa5e2ee..70e7429fd8ea 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1532,6 +1532,8 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, ret = 1; if (!prot_numa) { entry = pmdp_get_and_clear(mm, addr, pmd); + if (pmd_numa(entry)) + entry = pmd_mknonnuma(entry); entry = pmd_modify(entry, newprot); ret = HPAGE_PMD_NR; BUG_ON(pmd_write(entry)); diff --git a/mm/mprotect.c b/mm/mprotect.c index 1291a053b167..f8421722acb9 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -54,6 +54,8 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd, if (!prot_numa) { ptent = ptep_modify_prot_start(mm, addr, pte); + if (pte_numa(ptent)) + ptent = pte_mknonnuma(ptent); ptent = pte_modify(ptent, newprot); updated = true; } else { -- cgit v1.2.3-59-g8ed1b