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Mon, 9 Aug 2021 06:36:48 +0000 Received: from [10.2.53.40] (172.20.187.6) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 9 Aug 2021 06:36:48 +0000 Subject: Re: [PATCH 3/3] mm/gup: refactor and simplify try_get_page() To: Christoph Hellwig CC: Andrew Morton , Matthew Wilcox , LKML , References: <20210808235018.1924918-1-jhubbard@nvidia.com> <20210808235018.1924918-4-jhubbard@nvidia.com> From: John Hubbard Message-ID: Date: Sun, 8 Aug 2021 23:36:47 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [172.20.187.6] X-ClientProxiedBy: HQMAIL111.nvidia.com (172.20.187.18) To HQMAIL107.nvidia.com (172.20.187.13) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 6f7eb4a6-ce10-40d1-66b5-08d95b001098 X-MS-TrafficTypeDiagnostic: DM5PR12MB1643: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:5516; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Aug 2021 06:36:48.5027 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6f7eb4a6-ce10-40d1-66b5-08d95b001098 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.112.34];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT031.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR12MB1643 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: ED21CB009632 Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=tHfiIdVt; dmarc=pass (policy=quarantine) header.from=nvidia.com; spf=none (imf24.hostedemail.com: domain of jhubbard@nvidia.com has no SPF policy when checking 40.107.243.45) smtp.mailfrom=jhubbard@nvidia.com X-Stat-Signature: sp3zpoifrmusfgxn3s5458xx6mcgex5d X-HE-Tag: 1628491010-319290 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 8/8/21 11:29 PM, Christoph Hellwig wrote: > On Sun, Aug 08, 2021 at 04:50:18PM -0700, John Hubbard wrote: >> +/* >> + * This has the same functionality as try_get_compound_head(), just with a >> + * slightly different API. >> + */ >> static inline __must_check bool try_get_page(struct page *page) >> { >> + return try_get_compound_head(page, 1) != NULL; > > What about removing try_get_page entirely instead? > This thought admittedly crossed my mind, but I was worried maybe I was getting carried away with cleanups. But now that at least one other person thinks that's reasonable, I'll be glad to cleanup the callers too. thanks, -- John Hubbard NVIDIA