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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 11/31] cpuset: Provide lockdep check for cpuset lock held Date: Wed, 5 Nov 2025 22:03:27 +0100 Message-ID: <20251105210348.35256-12-frederic@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251105210348.35256-1-frederic@kernel.org> References: <20251105210348.35256-1-frederic@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 371D1A0007 X-Stat-Signature: 457u3xam7oegmcpip6u477u11bxkmy7g X-Rspam-User: X-HE-Tag: 1762376730-12715 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 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