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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: Thu, 1 Jan 2026 23:13:37 +0100 Message-ID: <20260101221359.22298-13-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260101221359.22298-1-frederic@kernel.org> References: <20260101221359.22298-1-frederic@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 721C9A0008 X-Stat-Signature: rcqzkyed4jo3pagw3bc1rj44cgskqnez X-Rspam-User: X-HE-Tag: 1767305753-331965 X-HE-Meta: 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 npOVAVty 0bo8awjFHSYGlkI5WmHEnVZlF+cVA5bwelVAFM5TTBCN/y3MafOqp4QcvJuIcYPzBotMZn06yosgLrHzzmzk1vbsguKvZ0D0nNIOGLuSITsuoQ80YQjPVBGWpd9oTV2gC+wcvmGTO9Xth3NPz0coKCvThHPaHF4s9d4Y6ycO8YRMRwikTHiJ+UIhC+Bnsr4alo0eGUeX78ls+HLijfTgSiz/4CRsweWRG0B2mowkR3pM9KCGwgchBcNiEuu45z9sHLf1B8HS18ErrxhGMD8bCckWY1A== 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