From patchwork Wed Aug 2 20:38:21 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Tatashin X-Patchwork-Id: 796785 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=sparclinux-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3xN4nq0HrHz9s78 for ; Thu, 3 Aug 2017 06:40:31 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752968AbdHBUkQ (ORCPT ); Wed, 2 Aug 2017 16:40:16 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:35992 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752721AbdHBUkO (ORCPT ); Wed, 2 Aug 2017 16:40:14 -0400 Received: from aserv0022.oracle.com (aserv0022.oracle.com [141.146.126.234]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id v72KceOM019876 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Aug 2017 20:38:41 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserv0022.oracle.com (8.14.4/8.14.4) with ESMTP id v72Kcet6007423 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Aug 2017 20:38:40 GMT Received: from abhmp0001.oracle.com (abhmp0001.oracle.com [141.146.116.7]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id v72Kcdw9005690; Wed, 2 Aug 2017 20:38:39 GMT Received: from ca-ldom-ol-build-1.us.oracle.com (/10.129.68.23) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 02 Aug 2017 13:38:38 -0700 From: Pavel Tatashin To: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, kasan-dev@googlegroups.com, borntraeger@de.ibm.com, heiko.carstens@de.ibm.com, davem@davemloft.net, willy@infradead.org, mhocko@kernel.org Subject: [v4 12/15] mm: explicitly zero pagetable memory Date: Wed, 2 Aug 2017 16:38:21 -0400 Message-Id: <1501706304-869240-13-git-send-email-pasha.tatashin@oracle.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1501706304-869240-1-git-send-email-pasha.tatashin@oracle.com> References: <1501706304-869240-1-git-send-email-pasha.tatashin@oracle.com> X-Source-IP: aserv0022.oracle.com [141.146.126.234] Sender: sparclinux-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: sparclinux@vger.kernel.org Soon vmemmap_alloc_block() will no longer zero the block, so zero memory at its call sites for everything except struct pages. Struct page memory is zero'd by struct page initialization. Signed-off-by: Pavel Tatashin Reviewed-by: Steven Sistare Reviewed-by: Daniel Jordan Reviewed-by: Bob Picco --- mm/sparse-vmemmap.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c index c50b1a14d55e..d40c721ab19f 100644 --- a/mm/sparse-vmemmap.c +++ b/mm/sparse-vmemmap.c @@ -191,6 +191,7 @@ pmd_t * __meminit vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node) void *p = vmemmap_alloc_block(PAGE_SIZE, node); if (!p) return NULL; + memset(p, 0, PAGE_SIZE); pmd_populate_kernel(&init_mm, pmd, p); } return pmd; @@ -203,6 +204,7 @@ pud_t * __meminit vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node) void *p = vmemmap_alloc_block(PAGE_SIZE, node); if (!p) return NULL; + memset(p, 0, PAGE_SIZE); pud_populate(&init_mm, pud, p); } return pud; @@ -215,6 +217,7 @@ p4d_t * __meminit vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node) void *p = vmemmap_alloc_block(PAGE_SIZE, node); if (!p) return NULL; + memset(p, 0, PAGE_SIZE); p4d_populate(&init_mm, p4d, p); } return p4d; @@ -227,6 +230,7 @@ pgd_t * __meminit vmemmap_pgd_populate(unsigned long addr, int node) void *p = vmemmap_alloc_block(PAGE_SIZE, node); if (!p) return NULL; + memset(p, 0, PAGE_SIZE); pgd_populate(&init_mm, pgd, p); } return pgd;