slub: explicitly document position of inserting slab to partial list
Adding slab to partial list head/tail is sensitive to performance. So explicitly uses DEACTIVATE_TO_TAIL/DEACTIVATE_TO_HEAD to document it to avoid we get it wrong. Acked-by: NChristoph Lameter <cl@linux.com> Signed-off-by: NShaohua Li <shli@kernel.org> Signed-off-by: NShaohua Li <shaohua.li@intel.com> Signed-off-by: NPekka Enberg <penberg@kernel.org>
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