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Feb 2024 19:07:45 +0000 Date: Tue, 13 Feb 2024 11:07:42 -0800 From: Dan Williams To: Lukas Wunner , Mathieu Desnoyers CC: Dan Williams , Arnd Bergmann , Dave Chinner , , "Andrew Morton" , Linus Torvalds , Vishal Verma , Dave Jiang , Matthew Wilcox , Russell King , , , , , , , , Subject: Re: [PATCH v5 1/8] dax: alloc_dax() return ERR_PTR(-EOPNOTSUPP) for CONFIG_DAX=n Message-ID: <65cbbdfe19172_29b129476@dwillia2-mobl3.amr.corp.intel.com.notmuch> References: <20240212163101.19614-1-mathieu.desnoyers@efficios.com> <20240212163101.19614-2-mathieu.desnoyers@efficios.com> <20240213063226.GA4740@wunner.de> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20240213063226.GA4740@wunner.de> X-ClientProxiedBy: MW4PR04CA0057.namprd04.prod.outlook.com (2603:10b6:303:6a::32) To PH8PR11MB8107.namprd11.prod.outlook.com (2603:10b6:510:256::6) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH8PR11MB8107:EE_|CO1PR11MB5138:EE_ 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rGwtRd/g+vOU2M6y6j6xOvdaDyUFK8n6k8J1zLrt80fTXtbGdh1/1eDOy1dVwPPo+Aln0vJqPnXkhANwx1cB9ibS6nNDDZkaTkEBMFRpEqIVYtplHGPpOWGjALqYNeU2y15RkION5TtvXzp8sdQImU2oZTxAlTZqr9xiPwh1PWUQhjPVV3iKHYOT6gDvE/iQDJCyv+KnPXvXHQWajS0cEgZbe+UiHflEJw0kz+5iR/oQLLI0yJDJMvNiLWKnJhv0wu5ghJKaVIAteanldryzJ8XAzEdjfCVZpkRyZoyCSJ+4Wqj5Sw+CaaXv5cmdVY7lmujBhdcEM/cNwlMJa0ZWyAicMHn+Ic7VRNjJjdxVPp83Lv6Wzp+TbccPOBG/PtlKZF8vA 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: List-Subscribe: List-Unsubscribe: Lukas Wunner wrote: > On Mon, Feb 12, 2024 at 11:30:54AM -0500, Mathieu Desnoyers wrote: > > Change the return value from NULL to PTR_ERR(-EOPNOTSUPP) for > > CONFIG_DAX=n to be consistent with the fact that CONFIG_DAX=y > > never returns NULL. > > All the callers of alloc_dax() only check for IS_ERR(). > > Doesn't this result in a change of behavior in all the callers? > Previously they'd ignore the NULL return value and continue, > now they'll error out. > > Given that, seems dangerous to add a Fixes tag with a v4.0 commit > and thus risk regressing all stable kernels. Oh, good catch, yes that Fixes tag should be: 4e4ced93794a dax: Move mandatory ->zero_page_range() check in alloc_dax() ...as that was the one that updated the alloc_dax() calling convention without fixing up the CONFIG_DAX=n case. This is a pre-requisite for restoring DAX operation on ARM32.