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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jan 2025 18:41:22.0562 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8f92311c-cb4d-4fb2-7eab-08dd31a66139 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF0002BA50.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4416 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250110_184130_362142_B846FF71 X-CRM114-Status: GOOD ( 15.37 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Jan 10, 2025 at 10:51:49AM -0400, Jason Gunthorpe wrote: > On Fri, Jan 10, 2025 at 07:12:46AM +0000, Tian, Kevin wrote: > > > > + if (!viommu) > > > + return -ENODEV; > > > + if (WARN_ON_ONCE(!viommu->ops || !viommu->ops- > > > >supports_veventq || > > > + !viommu->ops->supports_veventq(type))) > > > + return -EOPNOTSUPP; > > > > Hmm the driver knows which type is supported by itself before > > calling this helper. Why bother having the helper calling into > > the driver again to verify? > > Indeed, it might make sense to protect this with > > if (IS_ENABLED(CONFIG_IOMMUFD_TEST)) > > As a compiled out assertion > > Or drop it > > We shouldn't have unnecessary argument validation on fast paths, > !viommu should go too. Ack. I will drop those two if-statments. Nicolin