slub: Extract get_freelist from __slab_alloc
get_freelist retrieves free objects from the page freelist (put there by remote frees) or deactivates a slab page if no more objects are available. Acked-by: NDavid Rientjes <rientjes@google.com> Signed-off-by: NChristoph Lameter <cl@linux.com> Signed-off-by: NPekka Enberg <penberg@kernel.org>
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