mm/slab: Convert kmem_getpages() and kmem_freepages() to struct slab
These functions sit at the boundary to page allocator. Also use folio internally to avoid extra compound_head() when dealing with page flags. Signed-off-by: NVlastimil Babka <vbabka@suse.cz> Reviewed-by: NRoman Gushchin <guro@fb.com> Reviewed-by: NHyeonggon Yoo <42.hyeyoo@gmail.com> Tested-by: NHyeonggon Yoo <42.hyeyoo@gmail.com>
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