The following commit has been merged into the core/rcu branch of tip: Commit-ID: 43759fe5a137389e94ed6d4680c3c63c17273158 Gitweb: https://git.kernel.org/tip/43759fe5a137389e94ed6d4680c3c63c17273158 Author: Frederic Weisbecker <[email protected]> AuthorDate: Wed, 11 Nov 2020 23:53:13 +01:00 Committer: Paul E. McKenney <[email protected]> CommitterDate: Wed, 06 Jan 2021 16:24:59 -08:00
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 <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Josh Triplett <[email protected]> Cc: Steven Rostedt <[email protected]> Cc: Mathieu Desnoyers <[email protected]> Cc: Lai Jiangshan <[email protected]> Cc: Joel Fernandes <[email protected]> Cc: Neeraj Upadhyay <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Boqun Feng <[email protected]> Signed-off-by: Paul E. McKenney <[email protected]> --- include/linux/cpu.h | 2 ++ kernel/cpu.c | 7 +++++++ 2 files changed, 9 insertions(+) diff --git a/include/linux/cpu.h b/include/linux/cpu.h index d6428aa..3aaa068 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 4e11e91..1b6302e 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_);
