lockdep: Add novalidate class for dev->mutex conversion
The conversion of device->sem to device->mutex resulted in lockdep
warnings. Create a novalidate class for now until the driver folks
come up with separate classes. That way we have at least the basic
mutex debugging coverage.
Add a checkpatch error so the usage is reserved for device->mutex.
[ tglx: checkpatch and compile fix for LOCKDEP=n ]
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index a03977a9..06aed83 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -44,6 +44,8 @@
struct lockdep_subclass_key subkeys[MAX_LOCKDEP_SUBCLASSES];
};
+extern struct lock_class_key __lockdep_no_validate__;
+
#define LOCKSTAT_POINTS 4
/*
@@ -270,6 +272,9 @@
#define lockdep_set_subclass(lock, sub) \
lockdep_init_map(&(lock)->dep_map, #lock, \
(lock)->dep_map.key, sub)
+
+#define lockdep_set_novalidate_class(lock) \
+ lockdep_set_class(lock, &__lockdep_no_validate__)
/*
* Compare locking classes
*/
@@ -354,6 +359,9 @@
#define lockdep_set_class_and_subclass(lock, key, sub) \
do { (void)(key); } while (0)
#define lockdep_set_subclass(lock, sub) do { } while (0)
+
+#define lockdep_set_novalidate_class(lock) do { } while (0)
+
/*
* We don't define lockdep_match_class() and lockdep_match_key() for !LOCKDEP
* case since the result is not well defined and the caller should rather