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[PATCH] mm/vmalloc: fix mischeck pfn valid in vmap_pfns To: Hillf Danton , Christoph Hellwig Cc: bingbu.cao@linux.intel.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, opensource.kernel@vivo.com, urezki@gmail.com, vivek.kasireddy@intel.com References: <20250317055304.GB26662@lst.de> <5a12454c-16a1-4400-a764-f49293d8dece@vivo.com> <20250318064805.GA16121@lst.de> <5229b24f-1984-4225-ae03-8b952de56e3b@vivo.com> <20250318083330.GB18902@lst.de> <20250318084453.GB19274@lst.de> <20250319050359.3484-1-hdanton@sina.com> <20250319112651.3502-1-hdanton@sina.com> From: Huan Yang In-Reply-To: <20250319112651.3502-1-hdanton@sina.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: TYXPR01CA0050.jpnprd01.prod.outlook.com (2603:1096:403:a::20) To PUZPR06MB5676.apcprd06.prod.outlook.com (2603:1096:301:f8::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PUZPR06MB5676:EE_|OSQPR06MB7279:EE_ 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 oaV5mN9P rCop+MysU/54Al1cgKQ30t6EBE2xlYIoDbx07lNhuXEdjAUCOvZI9FVSfrWqbeUv9Af7jQSVuVO8p72V7qgxKPQlVR2TJjMYJUaUfK+N07Z9S2b2UXnEvoY1VpicQGoRNBv9GWSN6ZvuEkb+K6Oz6iWzI7zJkhl9qgtytkpv74dJno687xjcJ3K/irS2/MdEfSLwtmLbvwzKAj4PJ2JerdIW/l7uSDTmhOE5KSPWCmhDb9GnUazGKHM9TBNQX7WMYtBOtkC2PUXXSIaXqqHuoUYhDQC69tr7/R+BaIKCzf1nGO9NOA+il6nnPpGVh/C6QbzIXCU40wPWthxzKYEm12jgLvr/AHC8gIuxdDAf5KJPYyPZ09VuU1ki8VVGUVoMtbms+KcgSdtK6vVcmsjItCnCKx0JpAxQeR58Q5+VrL9ZVQdIWjJrx2HNTC1jnO7zXIx9imRZa6UwjGSd/kl9u56k1IxduSr1jLYeY X-Bogosity: Ham, tests=bogofilter, spamicity=0.016735, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: HI Hillf, Thanks fo your suggestion. 在 2025/3/19 19:26, Hillf Danton 写道: > On Wed, 19 Mar 2025 09:08:51 +0100 Christoph Hellwig wrote: >> On Wed, Mar 19, 2025 at 01:03:55PM +0800, Hillf Danton wrote: >>> A quick fix is to add a vmap_pfn variant to walk around the pfn >>> check in question, like the following diff (just for idea show). >> No. >> > Patient to see your fix, given no low hanging peach left for Mr Folio > in case of HVO, (feel free to ignore, who is likely about 2.6-mile > less tough than you could be). I now believe there are two way to resolve the HVO folio can't vmap in udmabuf. 1. simple copy vmap_pfn code, don't bother common vmap_pfn, use by itself and remove pfn_valid check. 2. implement folio array based vmap(vmap_folios), which can given a range of each folio(offset, nr_pages), so can suit HVO folio's vmap. 1 is simple and can fast fix this issue, but may not too good. I need discuss with bot Christoph and udmabuf's maintainer. 2 is hard, but may worth to research, which I also will try to do. :)