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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] cpu: Provide lockdep check for CPU hotplug lock write-held Date: Thu, 1 Jan 2026 23:13:36 +0100 Message-ID: <20260101221359.22298-12-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-Transfer-Encoding: 8bit X-Stat-Signature: ca6becysebe1e9omaz6nm4azhgxu6t4y X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 5F342C000D X-HE-Tag: 1767305745-197224 X-HE-Meta: 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 Qmug3wXt W3JJdS9DPYm45vN/mfk9l+CWSAlA0p31SVz2UNr6Y4SVpjGDajEc/iN8JFYzYNlZpVOWA4eGWVbLG1h6sUkLI+0mhbFJ6u9hSjFTbwTYJUFHTo1gou1MD1eqIfDD3vo4IsssoKRYFEN4Y42E5oc9/+MR/cQ2t8E+l22su/xVUfQb4Tr8Lhtdk5uCU/8J1+BDr1oPibj91gmbJDxRQ6YRyaumfA57tqXq3qhAisN7x59SPAkM6zqg3EwU2PuO6E3PF2dDMiPyNmcbRhJk= 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 cpu hotplug lock read-held. This means that write-holding the CPU hotplug lock is safe to synchronize against housekeeping cpumask changes. Provide a lockdep check to validate that. Signed-off-by: Frederic Weisbecker --- include/linux/cpuhplock.h | 1 + include/linux/percpu-rwsem.h | 1 + kernel/cpu.c | 5 +++++ 3 files changed, 7 insertions(+) diff --git a/include/linux/cpuhplock.h b/include/linux/cpuhplock.h index f7aa20f62b87..286b3ab92e15 100644 --- a/include/linux/cpuhplock.h +++ b/include/linux/cpuhplock.h @@ -13,6 +13,7 @@ struct device; extern int lockdep_is_cpus_held(void); +extern int lockdep_is_cpus_write_held(void); #ifdef CONFIG_HOTPLUG_CPU void cpus_write_lock(void); diff --git a/include/linux/percpu-rwsem.h b/include/linux/percpu-rwsem.h index 288f5235649a..c8cb010d655e 100644 --- a/include/linux/percpu-rwsem.h +++ b/include/linux/percpu-rwsem.h @@ -161,6 +161,7 @@ extern void percpu_free_rwsem(struct percpu_rw_semaphore *); __percpu_init_rwsem(sem, #sem, &rwsem_key); \ }) +#define percpu_rwsem_is_write_held(sem) lockdep_is_held_type(sem, 0) #define percpu_rwsem_is_held(sem) lockdep_is_held(sem) #define percpu_rwsem_assert_held(sem) lockdep_assert_held(sem) diff --git a/kernel/cpu.c b/kernel/cpu.c index 40b8496f47c5..01968a5c4a16 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -534,6 +534,11 @@ int lockdep_is_cpus_held(void) { return percpu_rwsem_is_held(&cpu_hotplug_lock); } + +int lockdep_is_cpus_write_held(void) +{ + return percpu_rwsem_is_write_held(&cpu_hotplug_lock); +} #endif static void lockdep_acquire_cpus_lock(void) -- 2.51.1