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: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Andrew Morton <akpm@linux-foundation.org>

2 files changed, 0 insertions, 2 deletions

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 660a87a22511..42f6d20358ad 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -668,7 +668,6 @@ 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);
diff --git a/mm/slob.c b/mm/slob.c
index 23631e2bb57a..19d2e5d46724 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -639,7 +639,6 @@ 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 {