diff options
| author | Frederic Weisbecker <frederic@kernel.org> | 2025-05-27 15:33:01 +0200 |
|---|---|---|
| committer | Frederic Weisbecker <frederic@kernel.org> | 2026-02-03 15:23:33 +0100 |
| commit | 622c508bcf4852ad56ae37bf6f08e9a4e6aa95b2 (patch) | |
| tree | 580f02393150240c322e2a4fd376f7cf0ea36261 /kernel | |
| parent | b5de34ed87f39fc3f6eb7e7df543317e7efb94a8 (diff) | |
cpu: Provide lockdep check for CPU hotplug lock write-held
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 <frederic@kernel.org>
Cc: Marco Crivellari <marco.crivellari@suse.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Waiman Long <longman@redhat.com>
Cc: linux-kernel@vger.kernel.org
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/cpu.c | 5 |
1 files changed, 5 insertions, 0 deletions
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) |