From patchwork Wed Aug 2 20:38:17 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Tatashin X-Patchwork-Id: 796790 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 3xN4pm3SWlz9s78 for ; Thu, 3 Aug 2017 06:41:20 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752983AbdHBUj4 (ORCPT ); Wed, 2 Aug 2017 16:39:56 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:35673 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752285AbdHBUjx (ORCPT ); Wed, 2 Aug 2017 16:39:53 -0400 Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id v72KcaiX019795 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Aug 2017 20:38:36 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userv0021.oracle.com (8.14.4/8.14.4) with ESMTP id v72KcaJj024959 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Aug 2017 20:38:36 GMT Received: from abhmp0001.oracle.com (abhmp0001.oracle.com [141.146.116.7]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id v72KcZ2t024218; Wed, 2 Aug 2017 20:38:35 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 13:38:35 -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 08/15] mm: zero struct pages during initialization Date: Wed, 2 Aug 2017 16:38:17 -0400 Message-Id: <1501706304-869240-9-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: userv0021.oracle.com [156.151.31.71] Sender: sparclinux-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: sparclinux@vger.kernel.org Add struct page zeroing as a part of initialization of other fields in __init_single_page(). Signed-off-by: Pavel Tatashin Reviewed-by: Steven Sistare Reviewed-by: Daniel Jordan Reviewed-by: Bob Picco --- include/linux/mm.h | 9 +++++++++ mm/page_alloc.c | 1 + 2 files changed, 10 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 46b9ac5e8569..183ac5e733db 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -94,6 +94,15 @@ extern int mmap_rnd_compat_bits __read_mostly; #endif /* + * On some architectures it is expensive to call memset() for small sizes. + * Those architectures should provide their own implementation of "struct page" + * zeroing by defining this macro in . + */ +#ifndef mm_zero_struct_page +#define mm_zero_struct_page(pp) ((void)memset((pp), 0, sizeof(struct page))) +#endif + +/* * Default maximum number of active map areas, this limits the number of vmas * per mm struct. Users can overwrite this number by sysctl but there is a * problem. diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 99b9e2e06319..debea7c0febb 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1168,6 +1168,7 @@ static void free_one_page(struct zone *zone, static void __meminit __init_single_page(struct page *page, unsigned long pfn, unsigned long zone, int nid) { + mm_zero_struct_page(page); set_page_links(page, zone, nid, pfn); init_page_count(page); page_mapcount_reset(page);