slub: fast release on full slab

Make deactivation occur implicitly while checking out the current freelist.

This avoids one cmpxchg operation on a slab that is now fully in use.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

diff --cc include/linux/slub_def.h
Simple merge

diff --cc mm/slub.c
Simple merge