slub: Allow removal of slab caches during boot
Serialize kmem_cache_create and kmem_cache_destroy using the slub_lock. Only possible after the use of the slub_lock during dynamic dma creation has been removed. Then make sure that the setup of the slab sysfs entries does not race with kmem_cache_create and kmem_cache destroy. If a slab cache is removed before we have setup sysfs then simply skip over the sysfs handling. Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Roland Dreier <rdreier@cisco.com> Signed-off-by: NChristoph Lameter <cl@linux-foundation.org> Signed-off-by: NPekka Enberg <penberg@cs.helsinki.fi>
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