We currently have the ability to call lockdep_assert_held to throw a
warning when a spinlock isn't held in a codepath. There are also times
when we'd like to throw a warning when a lock is held (i.e. when there
is the potential for deadlock with atomic_dec_and_lock or similar).
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxxxxxxx>
---
include/linux/lockdep.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index 008388f920d7..1e5f1d544029 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -362,6 +362,8 @@ extern void lockdep_trace_alloc(gfp_t mask);
WARN_ON(debug_locks && !lockdep_is_held(l)); \
} while (0)
+#define lockdep_assert_not_held(l) WARN_ON(debug_locks && lockdep_is_held(l))
+
#define lockdep_recursing(tsk) ((tsk)->lockdep_recursion)
#else /* !CONFIG_LOCKDEP */
@@ -413,6 +415,8 @@ struct lock_class_key { };
#define lockdep_assert_held(l) do { (void)(l); } while (0)
+#define lockdep_assert_not_held(l) (void)(l)
+
#define lockdep_recursing(tsk) (0)
#endif /* !LOCKDEP */
--
1.9.3
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