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bh=3ik/NRqYHSG8hmITK6G3KaWPdzyg/qMeKl48YWWYUqc=; b=FAalNz8n80tXbjLu1YEIFUu9UhX73vltRahVCO39qSG0lfGoaJew0vQszt0dphBAjPSnLe 7C/FD4/TKQG67Y1B/y0dsYTwbjJzp8XI+uPmsYWLSRhFSL8psTth1rBNfiHP7Pwxv8lCkS TDI4rdGp9S0oezXRjJ36bL2EAtg+sygQdbSF6fTVdqYLjKZ7jo4U5NfPpkFOr2o9HOuWTj /6PuKr1BAXjl0+x4heqkOUOddzMYeBWs8AGL29P6pJnHTVKAF8UGAby6xTND2ABPKNgVED AOj44YWy7naeuHasGmrTDOFaMXE/8Txy4Eo3Krw9/b2ZNN1pdjjL+l+L00m6aQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1756048097; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=3ik/NRqYHSG8hmITK6G3KaWPdzyg/qMeKl48YWWYUqc=; b=cB54om5a1WjZnAiZL0WpPY1A+vjsjucby/u6/KzywEDaNIPuqTKO2+T5qzphZpMpszCuEW b3lofR6L1VonsTDQ== To: Christophe Leroy , Michael Ellerman , Nicholas Piggin , Madhavan Srinivasan , Alexander Viro , Christian Brauner , Jan Kara , Ingo Molnar , Peter Zijlstra , Darren Hart , Davidlohr Bueso , Andre Almeida , Andrew Morton , David Laight , Dave Hansen , Linus Torvalds , Daniel Borkmann Cc: Christophe Leroy , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-block@vger.kernel.org Subject: Re: [PATCH v2 03/10] uaccess: Add masked_user_{read/write}_access_begin In-Reply-To: <7b570e237f7099d564d7b1a270169428ac1f3099.1755854833.git.christophe.leroy@csgroup.eu> References: <7b570e237f7099d564d7b1a270169428ac1f3099.1755854833.git.christophe.leroy@csgroup.eu> Date: Sun, 24 Aug 2025 17:08:15 +0200 Message-ID: <87h5xw3ggw.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain X-Rspamd-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: B6BBA20006 X-Stat-Signature: qpb851f9pgfhyb319d4o5qih5duhb16j X-HE-Tag: 1756048099-858413 X-HE-Meta: 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 B/IhR+fq 2n3WdBUaBGKN7hk62QtPU/NFATDI5TYuCn+JY8mSmXtwj9V/GPTvqo6W5+gjJwxBSPGpH2SCoEQPvlW/AbgTomIbzbT5pMLktxDlkmDKuefdrLrNt2JK2naM/auLNSM6UQN6Bt8FVB24XA58BEOaYnvIGkTCFjedLVUvwzOYAsQ0kJi3w7SUdHcyu+XNOW5S+YbpUNa05QmCDWRZPB1rFfuqaslpkX5FUc0ATGLJ7t0qulGvlpAs+3V04LvKPBDHiDXuwqDwo8aBRDPN5VWEbIqYAxtPNsN9oBqZQIHEQTauAAtdqY+DQQLnthkGfxEINoqPzFEW/XGlfZYWl8nHfT9ko7dXj3Wna2+rV2AfHbddV+zRegJVPJUFjweOEU9dz6ScyAI7LfGh7Qek= 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 Fri, Aug 22 2025 at 11:57, Christophe Leroy wrote: > Allthough masked_user_access_begin() is to only be used when reading > data from user at the moment, introduce masked_user_read_access_begin() > and masked_user_write_access_begin() in order to match > user_read_access_begin() and user_write_access_begin(). > > That means masked_user_read_access_begin() is used when user memory is > exclusively read during the window, masked_user_write_access_begin() > is used when user memory is exclusively writen during the window, > masked_user_access_begin() remains and is used when both reads and > writes are performed during the open window. Each of them is expected > to be terminated by the matching user_read_access_end(), > user_write_access_end() and user_access_end(). > > Have them default to masked_user_access_begin() when they are > not defined. Have you seen: https://lore.kernel.org/all/20250813151939.601040635@linutronix.de