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Received: from CH3PR12MB8659.namprd12.prod.outlook.com (2603:10b6:610:17c::13) by IA0PR12MB7751.namprd12.prod.outlook.com (2603:10b6:208:430::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8792.33; Thu, 5 Jun 2025 15:16:50 +0000 Received: from CH3PR12MB8659.namprd12.prod.outlook.com ([fe80::6eb6:7d37:7b4b:1732]) by CH3PR12MB8659.namprd12.prod.outlook.com ([fe80::6eb6:7d37:7b4b:1732%6]) with mapi id 15.20.8792.034; Thu, 5 Jun 2025 15:16:50 +0000 Date: Thu, 5 Jun 2025 12:16:48 -0300 From: Jason Gunthorpe To: Nicolin Chen Cc: kevin.tian@intel.com, corbet@lwn.net, will@kernel.org, bagasdotme@gmail.com, robin.murphy@arm.com, joro@8bytes.org, thierry.reding@gmail.com, vdumpa@nvidia.com, jonathanh@nvidia.com, shuah@kernel.org, jsnitsel@redhat.com, nathan@kernel.org, peterz@infradead.org, yi.l.liu@intel.com, mshavit@google.com, praan@google.com, zhangzekun11@huawei.com, iommu@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-tegra@vger.kernel.org, linux-kselftest@vger.kernel.org, patches@lists.linux.dev, mochs@nvidia.com, alok.a.tiwari@oracle.com, vasant.hegde@amd.com, dwmw2@infradead.org, baolu.lu@linux.intel.com Subject: Re: [PATCH v5 10/29] iommufd: Abstract iopt_pin_pages and iopt_unpin_pages helpers Message-ID: <20250605151648.GD19710@nvidia.com> References: <49f7143c1b513049fd8158278a11d9f8b6c837d3.1747537752.git.nicolinc@nvidia.com> <20250528171754.GY61950@nvidia.com> Content-Type: text/plain; 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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 Wed, Jun 04, 2025 at 09:11:07PM -0700, Nicolin Chen wrote: > I found the entire ictx would be locked by iommufd_access_create(), > then the release fop couldn't even get invoked to destroy objects. Yes, that makes sense.. It looks to me like you can safely leave ictx as NULL instead of adding a flag? That would be nicer than leaving a unrefcounted pointer floating around.. Jason