From f59de8992aa6dc85e81aadc26b0f69e17809721d Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Thu, 14 Jul 2011 15:19:09 +0200
Subject: 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 <tj@kernel.org>
Reported-and-tested-by: Christian Casteyde <casteyde.christian@free.fr>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=35532
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110714131909.GJ3455@htj.dyndns.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
kernel/lockdep.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
(limited to 'kernel')
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();
--
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