Commit 43759fe5 authored by Frederic Weisbecker's avatar Frederic Weisbecker Committed by Paul E. McKenney
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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: default avatarFrederic 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: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 634954c2

include/linux/cpu.h

+2 −0
Original line number Diff line number Diff line
@@ -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);

kernel/cpu.c

+7 −0
Original line number Diff line number Diff line
@@ -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_);