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Subject[PATCH v3 16/24] locking/lockdep: Retain the class key and name while freeing a lock class
Date
The next patch in this series uses the class name in code that
detects calls to lock_acquire() while a class key is being freed. Hence
retain the class name for lock classes that are being freed.

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
kernel/locking/lockdep.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index ecd92969674c..92bdb187987f 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -4147,10 +4147,8 @@ static void zap_class(struct lock_class *class)
* Unhash the class and remove it from the all_lock_classes list:
*/
hlist_del_rcu(&class->hash_entry);
+ class->hash_entry.pprev = NULL;
list_del(&class->lock_entry);
-
- RCU_INIT_POINTER(class->key, NULL);
- RCU_INIT_POINTER(class->name, NULL);
}

static inline int within(const void *addr, void *start, unsigned long size)
--
2.20.0.rc2.403.gdbc3b29805-goog
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