The patch titled
lockdep: clear whole lockdep_map on initialization
has been added to the -mm tree. Its filename is
lockdep-clear-whole-lockdep_map-on-initialization.patch
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------------------------------------------------------
Subject: lockdep: clear whole lockdep_map on initialization
From: Tejun Heo <tj@xxxxxxxxxx>
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@xxxxxxxxxx>
Reported-by: Christian Casteyde <casteyde.christian@xxxxxxx>
Tested-by: Christian Casteyde <casteyde.christian@xxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/lockdep.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff -puN kernel/lockdep.c~lockdep-clear-whole-lockdep_map-on-initialization kernel/lockdep.c
--- a/kernel/lockdep.c~lockdep-clear-whole-lockdep_map-on-initialization
+++ a/kernel/lockdep.c
@@ -2872,10 +2872,7 @@ static int mark_lock(struct task_struct
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();
_
Patches currently in -mm which might be from tj@xxxxxxxxxx are
origin.patch
signals-sys_ssetmask-sys_rt_sigsuspend-should-use-set_current_blocked.patch
linux-next.patch
lockdep-clear-whole-lockdep_map-on-initialization.patch
ipc-introduce-shm_rmid_forced-sysctl-testing.patch
scatterlist-new-helper-functions.patch
scatterlist-new-helper-functions-update.patch
scatterlist-new-helper-functions-update-fix.patch
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