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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: Sun, 25 Jan 2026 23:45:18 +0100 Message-ID: <20260125224541.50226-12-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-Transfer-Encoding: 8bit X-Stat-Signature: di8oiez4ngixebddcpqehmppz4qbpzyp X-Rspamd-Queue-Id: BF5AE20004 X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1769381241-84506 X-HE-Meta: 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 pmAnwNhD qvNpI4jn0XtXrezBIhSIvddCkojdmxLX7ifcWvNNZqu1CmYBminHyxBTdQjYa9X7T5eZd+u/+oxWFYayLd25Nua2SOkvhcSjLBLNa0bCkSbf0oFgSHvDr2ApXkO3FjPQDVD2nW19+KB1QNcG3LmruQumQtluKq1vVFUab4ZjOhp8RRH9oSuEE53hruSUsn6R1b+qYdYME0l0Um0ItnDc5YgpXiRgJtt1AEb2mdoNGQnRQZvcpt7GmUi5FwqWbEUyGPltKih85OKjiSqM= 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