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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-01-09 15:25:55 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-01-23 11:37:14 -0800
commit8dc79888a792f6c365c2a26903e49ff919e72488 (patch)
tree0c200a9e0515e1753c0baa9d827d684da8491345 /kernel/rcu
parentbb4e2c08bbfa8eb032db7814f6100086aac102d3 (diff)
downloadblackbird-op-linux-8dc79888a792f6c365c2a26903e49ff919e72488.tar.gz
blackbird-op-linux-8dc79888a792f6c365c2a26903e49ff919e72488.zip
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: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'kernel/rcu')
-rw-r--r--kernel/rcu/tree_exp.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h
index 303df97bbfc5..f3e214898e3a 100644
--- a/kernel/rcu/tree_exp.h
+++ b/kernel/rcu/tree_exp.h
@@ -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);
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