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Commit 8dc79888 authored by Paul E. McKenney's avatar Paul E. McKenney
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rcu: Add lockdep checks to synchronous expedited primitives 



The non-expedited synchronize_*rcu() primitives have lockdep checks, but
their expedited counterparts lack these checks.  This commit therefore
adds these checks to the expedited synchronize_*rcu() primitives.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
parent bb4e2c08

kernel/rcu/tree_exp.h

+10 −0
Original line number Diff line number Diff line
@@ -639,6 +639,11 @@ void synchronize_sched_expedited(void) 
{

	struct rcu_state *rsp = &rcu_sched_state;



	RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map) ||

			 lock_is_held(&rcu_lock_map) ||

			 lock_is_held(&rcu_sched_lock_map),

			 "Illegal synchronize_sched_expedited() in RCU read-side critical section");



	/* If only one CPU, this is automatically a grace period. */

	if (rcu_blocking_is_gp())

		return;
@@ -708,6 +713,11 @@ void synchronize_rcu_expedited(void) 
{

	struct rcu_state *rsp = rcu_state_p;



	RCU_LOCKDEP_WARN(lock_is_held(&rcu_bh_lock_map) ||

			 lock_is_held(&rcu_lock_map) ||

			 lock_is_held(&rcu_sched_lock_map),

			 "Illegal synchronize_rcu_expedited() in RCU read-side critical section");



	if (rcu_scheduler_active == RCU_SCHEDULER_INACTIVE)

		return;

	_synchronize_rcu_expedited(rsp, sync_rcu_exp_handler);