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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 12/33] cpuset: Provide lockdep check for cpuset lock held Date: Wed, 24 Dec 2025 14:44:59 +0100 Message-ID: <20251224134520.33231-13-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251224134520.33231-1-frederic@kernel.org> References: <20251224134520.33231-1-frederic@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 3E6271C0004 X-Stat-Signature: q51oxqy17gtixs34wg537e9nt79oug3x X-HE-Tag: 1766584036-722866 X-HE-Meta: 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 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 a98d3330385c..1c49ffd2ca9b 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 3afa72f8d579..5e2e3514c22e 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -283,6 +283,13 @@ 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) -- 2.51.1