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Commit 9a37110d authored by Peter Hurley's avatar Peter Hurley Committed by Greg Kroah-Hartman
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locking: Add WARN_ON_ONCE lock assertion 



An interface may need to assert a lock invariant and not flood the
system logs; add a lockdep helper macro equivalent to
lockdep_assert_held() which only WARNs once.

Signed-off-by: default avatarPeter Hurley <peter@hurleysoftware.com>
Acked-by: default avatarIngo Molnar <mingo@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 93b88774

include/linux/lockdep.h

+5 −0
Original line number Diff line number Diff line
@@ -362,6 +362,10 @@ extern void lockdep_trace_alloc(gfp_t mask); 
		WARN_ON(debug_locks && !lockdep_is_held(l));	\

	} while (0)



#define lockdep_assert_held_once(l)	do {				\

		WARN_ON_ONCE(debug_locks && !lockdep_is_held(l));	\

	} while (0)



#define lockdep_recursing(tsk)	((tsk)->lockdep_recursion)



#else /* !CONFIG_LOCKDEP */
@@ -412,6 +416,7 @@ struct lock_class_key { }; 
#define lockdep_depth(tsk)	(0)



#define lockdep_assert_held(l)			do { (void)(l); } while (0)

#define lockdep_assert_held_once(l)		do { (void)(l); } while (0)



#define lockdep_recursing(tsk)			(0)