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Subject[PATCH] mm: remove all rcu head initializations

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


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 <>
Signed-off-by: Paul E. McKenney <>
Cc: Christoph Lameter <>
Cc: Pekka Enberg <>
Cc: Matt Mackall <>
Cc: Andrew Morton <>

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 707d0dc..f03d8d6 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -663,7 +663,6 @@ int bdi_init(struct backing_dev_info *bdi)
bdi->max_ratio = 100;
bdi->max_prop_frac = PROP_FRAC_BASE;
- INIT_RCU_HEAD(&bdi->rcu_head);
diff --git a/mm/slob.c b/mm/slob.c
index 837ebd6..6de238d 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -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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