From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752480AbcF1Ri4 (ORCPT ); Tue, 28 Jun 2016 13:38:56 -0400 Received: from mga01.intel.com ([192.55.52.88]:41767 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751952AbcF1Riy (ORCPT ); Tue, 28 Jun 2016 13:38:54 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.26,542,1459839600"; d="scan'208";a="1006871871" From: "Huang, Ying" To: Andrew Morton Cc: Huang Ying , Minchan Kim , "Kirill A. Shutemov" , Vlastimil Babka , Jerome Marchand , Andrea Arcangeli , Ebru Akagunduz , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] MADVISE_FREE, THP: Fix madvise_free_huge_pmd return value after splitting Date: Tue, 28 Jun 2016 10:36:29 -0700 Message-Id: <1467135452-16688-1-git-send-email-ying.huang@intel.com> X-Mailer: git-send-email 2.8.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Huang Ying madvise_free_huge_pmd should return 0 if the fallback PTE operations are required. In madvise_free_huge_pmd, if part pages of THP are discarded, the THP will be split and fallback PTE operations should be used if splitting succeeds. But the original code will make fallback PTE operations skipped, after splitting succeeds. Fix that via make madvise_free_huge_pmd return 0 after splitting successfully, so that the fallback PTE operations will be done. Cc: Minchan Kim Signed-off-by: "Huang, Ying" --- mm/huge_memory.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 848c16c..546cd21 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1287,14 +1287,9 @@ int madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, if (next - addr != HPAGE_PMD_SIZE) { get_page(page); spin_unlock(ptl); - if (split_huge_page(page)) { - put_page(page); - unlock_page(page); - goto out_unlocked; - } + split_huge_page(page); put_page(page); unlock_page(page); - ret = 1; goto out_unlocked; } -- 2.8.1