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Fri, 19 Dec 2025 05:51:54 -0800 (PST) From: Swaraj Gaikwad To: lgoncalv@redhat.com Cc: akpm@linux-foundation.org, ast@kernel.org, bigeasy@linutronix.de, cl@gentwo.org, clrkwllms@kernel.org, david.hunter.linux@gmail.com, harry.yoo@oracle.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-rt-devel@lists.linux.dev, rientjes@google.com, roman.gushchin@linux.dev, rostedt@goodmis.org, skhan@linuxfoundation.org, swarajgaikwad1925@gmail.com, syzbot+b1546ad4a95331b2101e@syzkaller.appspotmail.com, vbabka@suse.cz Subject: Re: [PATCH] slab: fix kmalloc_nolock() context check for PREEMPT_RT Date: Fri, 19 Dec 2025 19:21:43 +0530 Message-ID: <20251219135143.7337-1-swarajgaikwad1925@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 3wfnq8dhtkzcbs6og6uttnqecwrysisc X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: DA0A11C001D X-Rspam-User: X-HE-Tag: 1766152315-869599 X-HE-Meta: U2FsdGVkX18Leiv/DH3N3LjM3uB+lqxvE50/OoYAyNz/3Yzs9Pszb2trFcAZZvo8SXwi/A4LPSkG6ik/czAiRnmMyDguaFRUylG37Qa19lZ9mEafbKTNw7QF0MCBSGrYn6I04wsVajewcbrb9pTg7mYDeP0TwhtRtzkr78dD9u1Mvbk7qh6nFbLwfCtBdZbiss+KH5eh0lY8vhJF4ry3hjKgtI3/9GLg65MqozRFH322uQSGrkgACdfMU+FBvh33dehp78KCjIguEa+oKDZtWs8x1EDfBkYQVACXhxldnNtZ51ols1CFHOKtKZVbcULVoibRvgtr2qIqeBjq+oMr0135LwXU8CpVzq5d3I93DE6JhRdeFg+JE2rgh1dfcnkStj9fEj58ngbKkgKU9YLbMnJt9KDS2WDHFcjs17Be2WiG2JYY+dnWfK6QVaRBZIwk7oHBNMredenz54MlGfZ5xqq7WlU6ZRCWJ9uVPQLPpbCh+DCDewHfTfm3RrF+s/6imzvHkOP/JSO6nKX4qUF6vz0mo445e4msLsFzeoaEFcmssIIQ0pv7eZfYPvKpf1hsJNtMHqS9/93h6B/UqnAa/Pn0sCtt3hf+DIjjCUKLEQh4X/HZh4WlG1pjwrVOYpnzXChPZZ93FP/0pPnqXkc6zVt1gXOZQpqtQrKIiNNecogBYHVntDN2vhnokmnHs+xTFunMSeBxSOwMGVbqYwAzdUK2AublCNceQ9fh01utxn5tymR2A3vWmWn8ijqcePVipL13Knt6z9w2QAjEOTexe4+DxI8lHaPqdBnL+AFZJKGE7i1memmZqvWoUG3x0hNNOEtZNLYUx/bDWDvT8ROazOKwl5+lUB2OLuB8z0A74CKPpVn1vP//y7J9ZbbUaruKF0XQrBj7InVmIRwrbmWZmCQ3GgCsfQ4w0N1DMzDIUdD91QWd1B2/0nw6YXHd2nXis9+UVVCvEtt3oVHtCnC yW5ovPoZ 7R5/p9vVXoIUBvotS/8WEEgKbk/nql+8adM5G5grAihr2YhJA/uWSqSzeuou4/K5AMTT/bvvM3x6Y9dlTDRCVyhJOFd1RJpCDhxptVHn3Dmst4aGWyDGVnAhmzlk20cq+AQAXGFdvU8AyozPFbzQQuNzliPfNNEnBndrU2mzLSB9UX1ww/o+Okl0/3woUFv4dgDpEsIyLlxZZtWo= 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: I agree that we can simplify this. I think !preemptible() would be the most descriptive choice here, as it directly expresses the constraint, we cannot take a sleeping lock when preemption is disabled. The updated check would be: if (IS_ENABLED(CONFIG_PREEMPT_RT) && !preemptible()) I'll send a v2 with this change unless there are objections. Swaraj