Messages in this thread Patch in this message | | | From | Peter Hurley <> | Subject | [PATCH] locking: Add WARN_ON_ONCE lock assertion | Date | Wed, 10 Sep 2014 14:31:39 -0400 |
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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.
cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Peter Hurley <peter@hurleysoftware.com> --- include/linux/lockdep.h | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 008388f9..64c7425 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -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) -- 2.1.0
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