diff options
| author | Peter Hurley <peter@hurleysoftware.com> | 2014-09-10 14:31:39 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-23 21:06:21 -0700 |
| commit | 9a37110d20c95d1ebf6c04881177fe8f62831db2 (patch) | |
| tree | 6c997c35c6e3193fc73e4bfeb74ddc5fee56f233 /include/linux/lockdep.h | |
| parent | 93b8877471796c04c16fdef755d4e5c0f521509f (diff) | |
| download | lwn-9a37110d20c95d1ebf6c04881177fe8f62831db2.tar.gz lwn-9a37110d20c95d1ebf6c04881177fe8f62831db2.zip | |
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: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/lockdep.h')
| -rw-r--r-- | include/linux/lockdep.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index 008388f920d7..64c7425afbce 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) |