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b=Q5Oe93SUJoRxpOC/5SMkA33Wwq0xOL/XOsCpvnmBXesXXS3ZsXUc/ZDLw2UvQCwIT nrddzYjjJvMC8sNrSiV3vBI9gCFje6HKLcgOlPapUO0hQqVrsfvs4wcTXJ/v5TPvEu DBh8IR8uZAqNL/5ZCk5ydMBsoePOEhzyzXYt+Mu8= Date: Wed, 7 May 2025 14:50:18 -0700 From: Andrew Morton To: Pantelis Antoniou Cc: , , Artem Krupotkin , Charles Briere , Wade Farnsworth Subject: Re: [PATCH 0/1] Fix zero copy I/O on __get_user_pages allocated pages Message-Id: <20250507145018.385c0a090a0d61c06e985ad9@linux-foundation.org> In-Reply-To: <20250507154105.763088-1-p.antoniou@partner.samsung.com> References: <20250507154105.763088-1-p.antoniou@partner.samsung.com> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 14D1D180004 X-Stat-Signature: q4kouwaxhcg78s6b7atuwij6dwnbn6ak X-Rspam-User: X-HE-Tag: 1746654620-507138 X-HE-Meta: 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 LjLEr6IE n54B5pVmBByI+0H++geREtIBDPBi9NST6D17IdgNNw4Lhj3JcpTNYpIJHI0WIBCViVHNcMwf5Q4wOHiLYuzRk3sBw+wgJ0D0Axw5uX9TJORcxAjWAW2IVxgdVxk5MyPZdLlTILIpt4MB/QCTxiCu71HI2rAI7GJY0a3SOPRG/VqZE+ds2yRe9OBqDeDg4CqNHnPO9e49XZ6Y7W949O2CnGu0FFgnxAW2+BG16LrEvG53KQsGUwBHyljdDElpUaF9P5waU2yFnZWnl/ak8AVGGTeBhH0YEwVz4sHMneRVgq8NHRKWFQz1xTVQAvkzXNSPXX0fy 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: On Wed, 7 May 2025 10:41:04 -0500 Pantelis Antoniou wrote: > Updates to network filesystems enabled zero copy I/O by using the > netfslib common accessors. Updates by whom? Are all the people who need to know about this being cc'ed here? > One example of that is the 9p filesystem which is commonly used in qemu > based setups for sharing files with the host. > > In our emulation environment we have noticed failing writes when performing > I/O from a userspace mapped DRM GEM buffer object. > The platform does not use VRAM, all graphics memory is regular DRAM memory, > allocated via __get_free_pages We should identify which kernel version(s) should be patched, please. 6.16-rc1? 6.15? -stable? I often make these decisions but in this case I have far too little information to be able to do that. Thanks.