From: Tejun Heo Date: Thu, 14 Jul 2011 13:19:09 +0000 (+0200) Subject: lockdep: Clear whole lockdep_map on initialization X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f59de89;p=linux-beck.git lockdep: Clear whole lockdep_map on initialization lockdep_init_map() only initializes parts of lockdep_map and triggers kmemcheck warning when it is copied as a whole. There isn't anything to be gained by clearing selectively. memset() the whole structure and remove loop for ->class_cache[] clearing. Addresses https://bugzilla.kernel.org/show_bug.cgi?id=35532 Signed-off-by: Tejun Heo Reported-and-tested-by: Christian Casteyde Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=35532 Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/20110714131909.GJ3455@htj.dyndns.org Signed-off-by: Ingo Molnar --- diff --git a/kernel/lockdep.c b/kernel/lockdep.c index 5903586f32a0..8c24294e477f 100644 --- a/kernel/lockdep.c +++ b/kernel/lockdep.c @@ -2874,10 +2874,7 @@ static int mark_lock(struct task_struct *curr, struct held_lock *this, void lockdep_init_map(struct lockdep_map *lock, const char *name, struct lock_class_key *key, int subclass) { - int i; - - for (i = 0; i < NR_LOCKDEP_CACHING_CLASSES; i++) - lock->class_cache[i] = NULL; + memset(lock, 0, sizeof(*lock)); #ifdef CONFIG_LOCK_STAT lock->cpu = raw_smp_processor_id();