path: root/kernel/lockdep.c
diff options
authorPeter Zijlstra <peterz@infradead.org>2010-03-19 01:37:42 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2010-05-21 09:37:30 -0700
commit1704f47b50b5d9e1b825e43e1baaf2c5897baf03 (patch)
tree60617ff867624f915f75a502f2207de5e586757a /kernel/lockdep.c
parent3142788b7967ccfd2f1813ee9e11aeb1e1cf7de2 (diff)
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>
Diffstat (limited to 'kernel/lockdep.c')
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index ec21304856d..54286798c37 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -2711,6 +2711,8 @@ void lockdep_init_map(struct lockdep_map *lock, const char *name,
+struct lock_class_key __lockdep_no_validate__;
* This gets called for every mutex_lock*()/spin_lock*() operation.
* We maintain the dependency maps and validate the locking attempt:
@@ -2745,6 +2747,9 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
return 0;
+ if (lock->key == &__lockdep_no_validate__)
+ check = 1;
if (!subclass)
class = lock->class_cache;