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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: Sun, 25 Jan 2026 23:45:19 +0100 Message-ID: <20260125224541.50226-13-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260125224541.50226-1-frederic@kernel.org> References: <20260125224541.50226-1-frederic@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 336524000E X-Stat-Signature: zq9sxphps5c4xed5enbob9zi9saoop5h X-Rspam-User: X-HE-Tag: 1769381250-335372 X-HE-Meta: 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 We9Ka/WI FE23eRT7y4cdxtQ913LtpZuBVO4rIMqr+yisp3s9/5VeNDA+35nPMZwIJnDrvs7RG0yE8a9qDHekiS1MxND5MPr+i1BJARxzNVvsR5cKgSTE0IOTJEcpirX/2OVrjQmw4OFWg0pCNGOsXb3p+CXc8YsK3R2cm3lUMO70hpHF6xOXoi6aTGOTaK7UGgq3kUR0oguUA7HL7poPyJXMXQ/QU0Z4Tv8lBZvRF3KzyQjy/sed1EDhb0s7NSuEWJWxGECtmVx0Ostn84GSE47DK9AdhkzLmoQ== 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