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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: Wed, 24 Dec 2025 14:44:58 +0100 Message-ID: <20251224134520.33231-12-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-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: C6675C0011 X-Rspamd-Server: rspam04 X-Stat-Signature: cpsaeerkmiobfadnuqacswfaomgpreqa X-HE-Tag: 1766584027-90350 X-HE-Meta: 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 9IQd4S+q o9hkmiWbe6BlLLRZr2YMkXGZFkcCvJoXJr92pWBlywK2DKwVUm16ddOj9zwDfz7Mrvzt3BbmfspX/fGbW6v57F0uuKvOMY0IYtTg6P3NdXiWHZPHrENzcwIDyrfVURzo65dBQqiXZ2Sb1tLuiZr/pRKHkVTtSYZumwkKiG26kfCJLxJtqAdKj/uCzymL1vR/egCCJQRP0YQVNQ8hT/fM1sqC/9M31ATNPjrPHhGxw4ehXWryl7NusMOV3TU5kcJSi0IbVa+S2GpN+t9o= 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