From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x226kkKwvryP3pRtu0pcI+ENcTkNtrHIk+fTz7xyr2+oid2UaoyI5FAGRDrjckPfbIVPyRz1l ARC-Seal: i=1; a=rsa-sha256; t=1517508133; cv=none; d=google.com; s=arc-20160816; b=VF49zkvt5pDpOAZImSPn8A0UWbyM5kNr59ohUMrCnhSyV9M81qzPdIlBV3zxEhEGZ5 JY58+ZTsJC6NETUECsBHoL7Yfq5YhBrMdsfOeiKTyo001SCkQw6dYiqbE8eQy4wJUaqP 6dgPbTUNo6fmhsy6wZs3MQBijOtNoP5NqAuWl4JfhNsGWqYnzGla1nyhVmSvZIC840pg HU7WnrL2J8gTIKrPktOUhGxyZ4/5KIdEDKjVtm95RMNIMWXn4Cuke0ITfhlOzswfIX+E 4T7111TUTMGTYHmwXvd+EPetpHGzC3QaSoLBy+LsewCmm62Gl2j2dNbZgvFJtxaQLRek U/UQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:in-reply-to:references:in-reply-to:message-id:date :subject:cc:to:from:dkim-signature:arc-authentication-results; bh=NxbTRPn0RuHG9VYIAhhQIgaatn1I1OF71ZHIgqrDpVA=; b=UwZNkWeEE7o1tVOGS7ns+bJkWLiQU1PUmq+CdtgRaS+TGTLqrOn0x4vUUzTzFN5dat Pn7iGQm/rRA+2geOL4IpfB4/MN5QYE72/ZwaQoEAIVGDmB1E3COyZkpKmkkH34lMmkIJ DpUYFybUA9IuVO3SSfbDDGwlhOv5CyEyLMacfjx0DxZkP3KSdd+QCTaDLzBEqp0N9pGA eVFQV7G+gvjtNmHfrjwfM9ztaDJl5pTLOl+qQ3prr72jExMpJT8uDFLUfUe1+mdxOIfv DIO224gilQGEx5tOyrFjvANcuNwxOhZTFjOv5sB4UoscXQ/Ndqc/mNFi6r1fJePdtqEQ dBAQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2017-10-26 header.b=CJCtQ2/i; spf=pass (google.com: domain of khalid.aziz@oracle.com designates 156.151.31.85 as permitted sender) smtp.mailfrom=khalid.aziz@oracle.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2017-10-26 header.b=CJCtQ2/i; spf=pass (google.com: domain of khalid.aziz@oracle.com designates 156.151.31.85 as permitted sender) smtp.mailfrom=khalid.aziz@oracle.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com From: Khalid Aziz To: akpm@linux-foundation.org, davem@davemloft.net Cc: Khalid Aziz , kstewart@linuxfoundation.org, pombredanne@nexb.com, tglx@linutronix.de, anthony.yznaga@oracle.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, Khalid Aziz Subject: [PATCH v11 09/10] mm: Allow arch code to override copy_highpage() Date: Thu, 1 Feb 2018 11:01:17 -0700 Message-Id: <3e5949f4cedfdd499bd745135bd99f36cbb13503.1517497017.git.khalid.aziz@oracle.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: References: In-Reply-To: References: X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=8792 signatures=668660 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1711220000 definitions=main-1802010231 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1591222607977470527?= X-GMAIL-MSGID: =?utf-8?q?1591222607977470527?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 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 Reviewed-by: Anthony Yznaga --- 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 */ -- 2.11.0