From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752197AbcBKOXF (ORCPT ); Thu, 11 Feb 2016 09:23:05 -0500 Received: from mga03.intel.com ([134.134.136.65]:37644 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751391AbcBKOXA (ORCPT ); Thu, 11 Feb 2016 09:23:00 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.22,431,1449561600"; d="scan'208";a="882085798" From: "Kirill A. Shutemov" To: Hugh Dickins , Andrea Arcangeli , Andrew Morton Cc: Dave Hansen , Vlastimil Babka , Christoph Lameter , Naoya Horiguchi , Jerome Marchand , Yang Shi , Sasha Levin , linux-kernel@vger.kernel.org, linux-mm@kvack.org, "Kirill A. Shutemov" Subject: [PATCHv2 15/28] thp: handle file COW faults Date: Thu, 11 Feb 2016 17:21:43 +0300 Message-Id: <1455200516-132137-16-git-send-email-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1455200516-132137-1-git-send-email-kirill.shutemov@linux.intel.com> References: <1455200516-132137-1-git-send-email-kirill.shutemov@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org File COW for THP is handled on pte level: just split the pmd. Signed-off-by: Kirill A. Shutemov --- mm/memory.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/mm/memory.c b/mm/memory.c index 6c98ed8e3c4a..19eff2164e5b 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3334,6 +3334,11 @@ static int wp_huge_pmd(struct fault_env *fe, pmd_t orig_pmd) if (fe->vma->vm_ops->pmd_fault) return fe->vma->vm_ops->pmd_fault(fe->vma, fe->address, fe->pmd, fe->flags); + + /* COW handled on pte level: split pmd */ + VM_BUG_ON_VMA(fe->vma->vm_flags & VM_SHARED, fe->vma); + split_huge_pmd(fe->vma, fe->pmd, fe->address); + return VM_FAULT_FALLBACK; } -- 2.7.0