slub: Invert locking and avoid slab lock
Locking slabs is no longer necesary if the arch supports cmpxchg operations and if no debuggin features are used on a slab. If the arch does not support cmpxchg then we fallback to use the slab lock to do a cmpxchg like operation. The patch also changes the lock order. Slab locks are subsumed to the node lock now. With that approach slab_trylocking is no longer necessary. Signed-off-by: NChristoph Lameter <cl@linux.com> Signed-off-by: NPekka Enberg <penberg@kernel.org>
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