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dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.117.160 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.160; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.117.160) by CO1NAM11FT113.mail.protection.outlook.com (10.13.174.180) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6199.32 via Frontend Transport; Tue, 28 Mar 2023 19:57:27 +0000 Received: from rnnvmail201.nvidia.com (10.129.68.8) by mail.nvidia.com (10.129.200.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.5; Tue, 28 Mar 2023 12:57:17 -0700 Received: from dev.nvidia.com (10.126.231.37) by rnnvmail201.nvidia.com (10.129.68.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.37; Tue, 28 Mar 2023 12:57:17 -0700 From: Chaitanya Kulkarni To: CC: , Chaitanya Kulkarni Subject: [PATCH 4/4] brd: use memcpy_from_page() in copy_from_brd() Date: Tue, 28 Mar 2023 12:56:26 -0700 Message-ID: <20230328195626.12075-5-kch@nvidia.com> X-Mailer: git-send-email 2.29.0 In-Reply-To: <20230328195626.12075-1-kch@nvidia.com> References: <20230328195626.12075-1-kch@nvidia.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.126.231.37] X-ClientProxiedBy: rnnvmail202.nvidia.com (10.129.68.7) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT113:EE_|MW4PR12MB7189:EE_ X-MS-Office365-Filtering-Correlation-Id: 46204c99-ee46-4ca4-a057-08db2fc6a828 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Mar 2023 19:57:27.3228 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 46204c99-ee46-4ca4-a057-08db2fc6a828 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT113.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB7189 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org In copy_from_brd() it uses kmap_atomic() call on the page in question to create source page mapping on buffer (src), then it uses memcpy() call to copy the data from mapped buffer (src) with added offset and size equals to number of bytes stored in copy variable. Then it uses the kunmap_atomic(), also from :include/linux/highmem.h: >From :include/linux/highmem.h: "kmap_atomic - Atomically map a page for temporary usage - Deprecated!" Use memcpy_from_page() helper does the same job of mapping and copying except it uses non deprecated kmap_local_page() and kunmap_local(). Signed-off-by: Chaitanya Kulkarni --- drivers/block/brd.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/drivers/block/brd.c b/drivers/block/brd.c index 3df4b45eded3..c1251159bd13 100644 --- a/drivers/block/brd.c +++ b/drivers/block/brd.c @@ -216,7 +216,6 @@ static void copy_from_brd(void *dst, struct brd_device *brd, sector_t sector, size_t n) { struct page *page; - void *src; unsigned int offset = (sector & (PAGE_SECTORS-1)) << SECTOR_SHIFT; size_t copy; @@ -232,11 +231,9 @@ static void copy_from_brd(void *dst, struct brd_device *brd, sector += copy >> SECTOR_SHIFT; copy = n - copy; page = brd_lookup_page(brd, sector); - if (page) { - src = kmap_atomic(page); - memcpy(dst, src, copy); - kunmap_atomic(src); - } else + if (page) + memcpy_from_page(dst, page, 0, copy); + else memset(dst, 0, copy); } } -- 2.29.0