From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755349Ab3LJPyv (ORCPT ); Tue, 10 Dec 2013 10:54:51 -0500 Received: from cantor2.suse.de ([195.135.220.15]:44427 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754866Ab3LJPvo (ORCPT ); Tue, 10 Dec 2013 10:51:44 -0500 From: Mel Gorman To: Andrew Morton Cc: Alex Thorlton , Rik van Riel , Linux-MM , LKML , Mel Gorman Subject: [PATCH 09/18] mm: numa: Clear numa hinting information on mprotect Date: Tue, 10 Dec 2013 15:51:27 +0000 Message-Id: <1386690695-27380-10-git-send-email-mgorman@suse.de> X-Mailer: git-send-email 1.8.4 In-Reply-To: <1386690695-27380-1-git-send-email-mgorman@suse.de> References: <1386690695-27380-1-git-send-email-mgorman@suse.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. Cc: stable@vger.kernel.org Signed-off-by: Mel Gorman Reviewed-by: Rik van Riel --- mm/huge_memory.c | 2 ++ mm/mprotect.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 0f00b96..0ecaba2 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1522,6 +1522,8 @@ 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 0a07e2d..eb2f349 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 { -- 1.8.4