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Miller" , Eric Dumazet , Gabriele Monaco , Greg Kroah-Hartman , Ingo Molnar , Jakub Kicinski , Jens Axboe , Johannes Weiner , Lai Jiangshan , Marco Crivellari , Michal Hocko , Muchun Song , Paolo Abeni , Peter Zijlstra , Phil Auld , "Rafael J . Wysocki" , Roman Gushchin , Shakeel Butt , Simon Horman , Tejun Heo , Thomas Gleixner , Vlastimil Babka , Waiman Long , Will Deacon , cgroups@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH 11/33] cpuset: Provide lockdep check for cpuset lock held Date: Mon, 13 Oct 2025 22:31:24 +0200 Message-ID: <20251013203146.10162-12-frederic@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251013203146.10162-1-frederic@kernel.org> References: <20251013203146.10162-1-frederic@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Stat-Signature: iy9mio7eo33iid9un1pbm9y6hubinkzp X-Rspamd-Queue-Id: A04B420016 X-Rspamd-Server: rspam06 X-Rspam-User: X-HE-Tag: 1760387606-824781 X-HE-Meta: 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 S5kqRZdk 4wfXJxG3Q91TXH+TE8AC+r6rwUEJKPhJQCuTNjTQyHZCb7C4rmqB9nYWbxkceX7PzBhnBFjdhop8PzsWlUEu2yryjeNSfVArinvc9eIS2cq7eIO8fbCxhdSt9V4fZkegagoPRJ8plh+zZTVxUzamc9nRKGGtAHsgo+IZNfpJ4XO88xJZNegg5m+j0bU0h+0qFQR8h8K7caZNPI55b7++BqDGBeY6it8vN67CCa+s482/XSsjZIJM2lzqt3KPjg1MQKHZm6eyxelvLJCvQ+UJ3/SUt+w== 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: cpuset modifies partitions, including isolated, while holding the cpuset mutex. This means that holding the cpuset mutex is safe to synchronize against housekeeping cpumask changes. Provide a lockdep check to validate that. Signed-off-by: Frederic Weisbecker --- include/linux/cpuset.h | 2 ++ kernel/cgroup/cpuset.c | 7 +++++++ 2 files changed, 9 insertions(+) diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h index 2ddb256187b5..051d36fec578 100644 --- a/include/linux/cpuset.h +++ b/include/linux/cpuset.h @@ -18,6 +18,8 @@ #include #include +extern bool lockdep_is_cpuset_held(void); + #ifdef CONFIG_CPUSETS /* diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 8595f1eadf23..aa1ac7bcf2ea 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -279,6 +279,13 @@ void cpuset_full_unlock(void) cpus_read_unlock(); } +#ifdef CONFIG_LOCKDEP +bool lockdep_is_cpuset_held(void) +{ + return lockdep_is_held(&cpuset_mutex); +} +#endif + static DEFINE_SPINLOCK(callback_lock); void cpuset_callback_lock_irq(void) -- 2.51.0