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Mon, 31 Mar 2025 16:35:43 +0000 Message-ID: Date: Mon, 31 Mar 2025 18:35:37 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next v5 2/2] page_pool: Track DMA-mapped pages and unmap them when destroying the pool To: =?UTF-8?Q?Toke_H=C3=B8iland-J=C3=B8rgensen?= CC: "David S. Miller" , Jakub Kicinski , Jesper Dangaard Brouer , Saeed Mahameed , Leon Romanovsky , Tariq Toukan , "Andrew Lunn" , Eric Dumazet , Paolo Abeni , Ilias Apalodimas , "Simon Horman" , Andrew Morton , "Mina Almasry" , Yonglong Liu , Yunsheng Lin , Pavel Begunkov , Matthew Wilcox , , , , , Qiuling Ren , Yuying Ma References: <20250328-page-pool-track-dma-v5-0-55002af683ad@redhat.com> <20250328-page-pool-track-dma-v5-2-55002af683ad@redhat.com> From: Alexander Lobakin Content-Language: en-US In-Reply-To: <20250328-page-pool-track-dma-v5-2-55002af683ad@redhat.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: DUZPR01CA0119.eurprd01.prod.exchangelabs.com (2603:10a6:10:4bc::19) To DS0PR11MB8718.namprd11.prod.outlook.com (2603:10b6:8:1b9::20) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB8718:EE_|SN7PR11MB7091:EE_ X-MS-Office365-Filtering-Correlation-Id: d8ae434c-b576-4422-9474-08dd707214c8 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|7416014|376014|1800799024|7053199007; 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This causes resource leaks and/or > crashes when there are pages still outstanding while the device is torn > down, because page_pool will attempt an unmap through a non-existent DMA > device on the subsequent page return. [...] > @@ -173,10 +212,10 @@ struct page_pool { > int cpuid; > u32 pages_state_hold_cnt; > > - bool has_init_callback:1; /* slow::init_callback is set */ > + bool dma_sync; /* Perform DMA sync for device */ Have you seen my comment under v3 (sorry but I missed that there was v4 already)? Can't we just test the bit atomically? > bool dma_map:1; /* Perform DMA mapping */ > - bool dma_sync:1; /* Perform DMA sync for device */ > bool dma_sync_for_cpu:1; /* Perform DMA sync for cpu */ > + bool has_init_callback:1; /* slow::init_callback is set */ Thanks, Olek