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| author |   Frederic Weisbecker <frederic@kernel.org> | 2020-11-11 23:53:13 +0100 |
|---|---|---|
| committer |   Paul E. McKenney <paulmck@kernel.org> | 2021-01-06 16:24:59 -0800 |
| commit | 43759fe5a137389e94ed6d4680c3c63c17273158 (patch) | |
| tree | e0fe88f37d34afdc28d8bd4094ceb42af195c1a8 | |
| parent | rcu/nocb: Locally accelerate callbacks as long as offloading isn't complete (diff) | |
| download | linux-dev-43759fe5a137389e94ed6d4680c3c63c17273158.tar.xz linux-dev-43759fe5a137389e94ed6d4680c3c63c17273158.zip | |
cpu/hotplug: Add lockdep_is_cpus_held()
This commit adds a lockdep_is_cpus_held() function to verify that the
proper locks are held and that various operations are running in the
correct context.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Neeraj Upadhyay <neeraju@codeaurora.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
| -rw-r--r-- | include/linux/cpu.h | 2 | ||||
| -rw-r--r-- | kernel/cpu.c | 7 |
2 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/cpu.h b/include/linux/cpu.h index d6428aaf67e7..3aaa0687e8df 100644 --- a/include/linux/cpu.h +++ b/include/linux/cpu.h @@ -111,6 +111,8 @@ static inline void cpu_maps_update_done(void) #endif /* CONFIG_SMP */ extern struct bus_type cpu_subsys; +extern int lockdep_is_cpus_held(void); + #ifdef CONFIG_HOTPLUG_CPU extern void cpus_write_lock(void); extern void cpus_write_unlock(void); diff --git a/kernel/cpu.c b/kernel/cpu.c index 4e11e91010e1..1b6302ecbabe 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -330,6 +330,13 @@ void lockdep_assert_cpus_held(void) percpu_rwsem_assert_held(&cpu_hotplug_lock); } +#ifdef CONFIG_LOCKDEP +int lockdep_is_cpus_held(void) +{ + return percpu_rwsem_is_held(&cpu_hotplug_lock); +} +#endif + static void lockdep_acquire_cpus_lock(void) { rwsem_acquire(&cpu_hotplug_lock.dep_map, 0, 0, _THIS_IP_); |