mm: remove all rcu head initializations

Hello!

Would you guys like to carry this patch, or should I push it up -tip? If I don't hear otherwise from you, I will push it up -tip. The INIT_RCU_HEAD() primitive is going away in favor of debugobjects.

Thanx, Paul

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mm: remove all rcu head initializations

Remove all rcu head inits. We don't care about the RCU head state before passing it to call_rcu() anyway. Only leave the "on_stack" variants so debugobjects can keep track of objects on stack.

Signed-off-by Mathieu Desnoyers <[email protected]>

Signed-off-by Paul E. McKenney <[email protected]>

Cc Christoph Lameter <[email protected]>

Cc Pekka Enberg <[email protected]>

Cc Matt Mackall <[email protected]>

Cc Andrew Morton <[email protected]>

mm/backing-dev.c +0 -1

index 707d0dc..f03d8d6 100644
@@ -663,7 +663,6 @@ int bdi_init(struct backing_dev_info *bdi)
 	bdi->max_ratio = 100;
 	bdi->max_prop_frac = PROP_FRAC_BASE;
 	spin_lock_init(&bdi->wb_lock);
-	INIT_RCU_HEAD(&bdi->rcu_head);
 	INIT_LIST_HEAD(&bdi->bdi_list);
 	INIT_LIST_HEAD(&bdi->wb_list);
 	INIT_LIST_HEAD(&bdi->work_list);

mm/slob.c +0 -2

index 837ebd6..6de238d 100644
@@ -647,7 +647,6 @@ void kmem_cache_free(struct kmem_cache *c, void *b)
 	if (unlikely(c->flags & SLAB_DESTROY_BY_RCU)) {
 		struct slob_rcu *slob_rcu;
 		slob_rcu = b + (c->size - sizeof(struct slob_rcu));
-		INIT_RCU_HEAD(&slob_rcu->head);
 		slob_rcu->size = c->size;
 		call_rcu(&slob_rcu->head, kmem_rcu_free);
 	} else {
 
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