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Wong" , Christoph Hellwig , John Hubbard , Matthew Wilcox , linux-mm@kvack.org, nvdimm@lists.linux.dev, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH 02/13] fsdax: Use page_maybe_dma_pinned() for DAX vs DMA collisions Message-ID: References: <166225775968.2351842.11156458342486082012.stgit@dwillia2-xfh.jf.intel.com> <166225777193.2351842.16365701080007152185.stgit@dwillia2-xfh.jf.intel.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <166225777193.2351842.16365701080007152185.stgit@dwillia2-xfh.jf.intel.com> X-ClientProxiedBy: MN2PR01CA0007.prod.exchangelabs.com (2603:10b6:208:10c::20) To MN2PR12MB4192.namprd12.prod.outlook.com (2603:10b6:208:1d5::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: d0e7be7c-86c6-4686-607d-08da90005eae X-MS-TrafficTypeDiagnostic: DM6PR12MB4355:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MN2PR12MB4192.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230016)(4636009)(346002)(396003)(366004)(376002)(136003)(39860400002)(41300700001)(38100700002)(6506007)(316002)(66556008)(86362001)(26005)(66476007)(6916009)(6512007)(66946007)(4326008)(8676002)(54906003)(8936002)(36756003)(2616005)(6486002)(478600001)(4744005)(5660300002)(2906002)(186003);DIR:OUT;SFP:1101; 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dkim=pass header.d=Nvidia.com header.s=selector2 header.b=sYyWQvH5; arc=pass ("microsoft.com:s=arcselector9901:i=1"); spf=pass (imf29.hostedemail.com: domain of jgg@nvidia.com designates 40.107.92.44 as permitted sender) smtp.mailfrom=jgg@nvidia.com; dmarc=pass (policy=reject) header.from=nvidia.com X-Rspamd-Server: rspam02 X-Rspam-User: X-Stat-Signature: mkh6qcbjbuimkf5z9k6upenox8frod5c X-HE-Tag: 1662466051-58285 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 Sat, Sep 03, 2022 at 07:16:12PM -0700, Dan Williams wrote: > diff --git a/mm/gup.c b/mm/gup.c > index 732825157430..499c46296fda 100644 > --- a/mm/gup.c > +++ b/mm/gup.c > @@ -177,8 +177,10 @@ static void gup_put_folio(struct folio *folio, int refs, unsigned int flags) > refs *= GUP_PIN_COUNTING_BIAS; > } > > - if (!put_devmap_managed_page_refs(&folio->page, refs)) > - folio_put_refs(folio, refs); > + folio_put_refs(folio, refs); Can this be made unconditional at this point in the series? Shouldn't something have been changed on the get ref side? Jason