slub: don't use cpu partial pages on UP
cpu partial pages are used to avoid contention which does not exist in the UP case. So let SLUB_CPU_PARTIAL depend on SMP. Acked-by: NChristoph Lameter <cl@linux.com> Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: NPekka Enberg <penberg@kernel.org>
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