diff mbox

[v2,074/117] lockdep: add lockdep_assert_not_held

Message ID 1403810017-16062-75-git-send-email-jlayton@primarydata.com (mailing list archive)
State New, archived
Headers show

Commit Message

Jeff Layton June 26, 2014, 7:12 p.m. UTC 
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@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
---
 include/linux/lockdep.h | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox

Patch

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 */