From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x225p6W3SDRGUQlijN7Sq+5qRpOCrI7MIHjxat1vGbzSMzyS6M3lhPKKuBUdDHXHY2vfOItHM ARC-Seal: i=1; a=rsa-sha256; t=1519233432; cv=none; d=google.com; s=arc-20160816; b=nbmEjhHnwjwoP1BPuJBynvlE2WhDOS62qtV/tSUeOOAebNqHFNRjITnnOG4SsvcY+y /4oMP8ifFoHPQYRWKZpQQt/FPdY9zWAjZ/MvK2jlMx7gdOlaQgqJFKlxjQMzsR/2HlpE nLLYRzWkBxznc0yOboOeFdCFPRB9ueAF2FHHVtXcUOQJWUWr1lF2e6mU650NwKLhmW0O EFHhxexzFJAUhOHL4xPnqksyYnroG9wY77tjR7eucvVnbPaC7uBxZWDiX3ivFXp6RFIM 3FnbxbcFQ+xaLg4p+EjEaP/mb90AspCDLpJkk/nw2Ohn9omaFh4gKf7bpKHJ8XrnMFdI BNzA== 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=owN09nLsgZBzMsMSYe7zR1KnJa7Yorbl+GDwt2mYjD3PyFS4HBhmtHJOFw7Wo0bjy/ kuUNT3//gLFDNleUwf9BtVS0DELIXYwPtMhhLX8SACvB0usRTebQ77J1gIsVDkqd8DrV dNAUv9uaQJv/BFnfQ0K4dsunuqjuvGSpdpP/KKHgy1105H61/rBRnaFu4Gw+Y05voy3e 8ZCArorFET+mF47ErUNfRxV2SMymNMyeVUI/1kw0Y7WR15cbKubXbjcTnlvPJMBLmQ13 oJcagfPG4euonR3YGXr9ue+XNyGUpCBbtigt97rWMk+2GkolavIBJGPK4iWBWQQne0zL LlBg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2017-10-26 header.b=ZSjBDxjr; spf=pass (google.com: domain of khalid.aziz@oracle.com designates 141.146.126.79 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=ZSjBDxjr; spf=pass (google.com: domain of khalid.aziz@oracle.com designates 141.146.126.79 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, dave.hansen@linux.intel.com Cc: Khalid Aziz , kstewart@linuxfoundation.org, pombredanne@nexb.com, tglx@linutronix.de, anthony.yznaga@oracle.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, sparclinux@vger.kernel.org, Khalid Aziz Subject: [PATCH v12 09/11] mm: Allow arch code to override copy_highpage() Date: Wed, 21 Feb 2018 10:15:51 -0700 Message-Id: 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=8811 signatures=668676 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-1802210211 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1593031715838543761?= X-GMAIL-MSGID: =?utf-8?q?1593031715838543761?= 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