From patchwork Thu Nov 16 14:38:32 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Khalid Aziz X-Patchwork-Id: 838605 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 3yd3mb6qSkz9s7G for ; Fri, 17 Nov 2017 01:39:43 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932506AbdKPOjn (ORCPT ); Thu, 16 Nov 2017 09:39:43 -0500 Received: from aserp1040.oracle.com ([141.146.126.69]:25137 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932800AbdKPOjB (ORCPT ); Thu, 16 Nov 2017 09:39:01 -0500 Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by aserp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id vAGEcsQG024056 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 16 Nov 2017 14:38:54 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserv0021.oracle.com (8.14.4/8.14.4) with ESMTP id vAGEcs3k009299 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 16 Nov 2017 14:38:54 GMT Received: from abhmp0001.oracle.com (abhmp0001.oracle.com [141.146.116.7]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id vAGEcsea027063; Thu, 16 Nov 2017 14:38:54 GMT Received: from concerto.us.oracle.com (/24.9.64.241) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 16 Nov 2017 06:38:54 -0800 From: Khalid Aziz To: akpm@linux-foundation.org, davem@davemloft.net Cc: Khalid Aziz , linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, Khalid Aziz Subject: [PATCH RESEND v10 09/10] mm: Allow arch code to override copy_highpage() Date: Thu, 16 Nov 2017 07:38:32 -0700 Message-Id: <6bf7a449fb35d9235b539bb452df23c453b23401.1510768775.git.khalid.aziz@oracle.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: References: In-Reply-To: References: X-Source-IP: aserv0021.oracle.com [141.146.126.233] Sender: sparclinux-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: sparclinux@vger.kernel.org Some architectures can support metadata for memory pages and when a page is copied, its metadata must also be copied. Sparc processors from M7 onwards support metadata for memory pages. This metadata provides tag based protection for access to memory pages. To maintain this protection, the tag data must be copied to the new page when a page is migrated across NUMA nodes. This patch allows arch specific code to override default copy_highpage() and copy metadata along with page data upon migration. Signed-off-by: Khalid Aziz Cc: Khalid Aziz --- v9: - new patch include/linux/highmem.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/highmem.h b/include/linux/highmem.h index 776f90f3a1cd..0690679832d4 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -237,6 +237,8 @@ static inline void copy_user_highpage(struct page *to, struct page *from, #endif +#ifndef __HAVE_ARCH_COPY_HIGHPAGE + static inline void copy_highpage(struct page *to, struct page *from) { char *vfrom, *vto; @@ -248,4 +250,6 @@ static inline void copy_highpage(struct page *to, struct page *from) kunmap_atomic(vfrom); } +#endif + #endif /* _LINUX_HIGHMEM_H */