From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754078AbdCPP2h (ORCPT ); Thu, 16 Mar 2017 11:28:37 -0400 Received: from mga11.intel.com ([192.55.52.93]:23687 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753881AbdCPP1m (ORCPT ); Thu, 16 Mar 2017 11:27:42 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.36,173,1486454400"; d="scan'208";a="1123600963" From: "Kirill A. Shutemov" To: Linus Torvalds , Andrew Morton , x86@kernel.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" Cc: Dave Hansen , "Aneesh Kumar K . V" , Steve Capper , Dann Frazier , Catalin Marinas , linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" , Andrea Arcangeli Subject: [PATCH 4/7] mm/gup: Make pages referenced during generic get_user_pages_fast() Date: Thu, 16 Mar 2017 18:26:52 +0300 Message-Id: <20170316152655.37789-5-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170316152655.37789-1-kirill.shutemov@linux.intel.com> References: <20170316152655.37789-1-kirill.shutemov@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is preparation patch for transition of x86 to generic GUP_fast() implementation. Unlike generic GUP_fast(), x86 version makes all pages it touches referenced. It seems required for GRU and EPT. See commit 8ee53820edfd ("thp: mmu_notifier_test_young"). Signed-off-by: Kirill A. Shutemov Cc: Andrea Arcangeli --- mm/gup.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/mm/gup.c b/mm/gup.c index ed2259dc4606..f0cfe225c08f 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -1238,6 +1238,8 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end, } VM_BUG_ON_PAGE(compound_head(page) != head, page); + + SetPageReferenced(page); pages[*nr] = page; (*nr)++; @@ -1299,6 +1301,7 @@ static int gup_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr, return 0; } + SetPageReferenced(head); return 1; } @@ -1334,6 +1337,7 @@ static int gup_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr, return 0; } + SetPageReferenced(head); return 1; } @@ -1370,6 +1374,7 @@ static int gup_huge_pgd(pgd_t orig, pgd_t *pgdp, unsigned long addr, return 0; } + SetPageReferenced(head); return 1; } -- 2.11.0