diff options
Diffstat (limited to 'kernel/locking/lockdep.c')
| -rw-r--r-- | kernel/locking/lockdep.c | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index bf694c709b96..90a3469a7a88 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -3402,17 +3402,17 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass, if (depth && !cross_lock(lock)) { hlock = curr->held_locks + depth - 1; if (hlock->class_idx == class_idx && nest_lock) { - if (hlock->references) { - /* - * Check: unsigned int references:12, overflow. - */ - if (DEBUG_LOCKS_WARN_ON(hlock->references == (1 << 12)-1)) - return 0; + if (!references) + references++; + if (!hlock->references) hlock->references++; - } else { - hlock->references = 2; - } + + hlock->references += references; + + /* Overflow */ + if (DEBUG_LOCKS_WARN_ON(hlock->references < references)) + return 0; return 1; } @@ -3688,6 +3688,9 @@ static int __lock_downgrade(struct lockdep_map *lock, unsigned long ip) unsigned int depth; int i; + if (unlikely(!debug_locks)) + return 0; + depth = curr->lockdep_depth; /* * This function is about (re)setting the class of a held lock, |