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Commit 108aae22 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Use WARN_ON_ONCE for DEBUG_OBJECTS_RCU_HEAD warnings 



Avoid additional multiple-warning confusion in memory-corruption scenarios.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
parent 561190e3

kernel/rcupdate.c

+6 −6
Original line number Diff line number Diff line
@@ -147,12 +147,12 @@ static int rcuhead_fixup_init(void *addr, enum debug_obj_state state) 
		 * attempt any fixup and just print a warning.

		 */

#ifndef CONFIG_PREEMPT

		WARN_ON(1);

		WARN_ON_ONCE(1);

		return 0;

#endif

		if (rcu_preempt_depth() != 0 || preempt_count() != 0 ||

		    irqs_disabled()) {

			WARN_ON(1);

			WARN_ON_ONCE(1);

			return 0;

		}

		rcu_barrier();
@@ -196,12 +196,12 @@ static int rcuhead_fixup_activate(void *addr, enum debug_obj_state state) 
		 * attempt any fixup and just print a warning.

		 */

#ifndef CONFIG_PREEMPT

		WARN_ON(1);

		WARN_ON_ONCE(1);

		return 0;

#endif

		if (rcu_preempt_depth() != 0 || preempt_count() != 0 ||

		    irqs_disabled()) {

			WARN_ON(1);

			WARN_ON_ONCE(1);

			return 0;

		}

		rcu_barrier();
@@ -233,12 +233,12 @@ static int rcuhead_fixup_free(void *addr, enum debug_obj_state state) 
		 * attempt any fixup and just print a warning.

		 */

#ifndef CONFIG_PREEMPT

		WARN_ON(1);

		WARN_ON_ONCE(1);

		return 0;

#endif

		if (rcu_preempt_depth() != 0 || preempt_count() != 0 ||

		    irqs_disabled()) {

			WARN_ON(1);

			WARN_ON_ONCE(1);

			return 0;

		}

		rcu_barrier();