SLAB_MATCH
SLAB_MATCH(memcg_data, obj_exts);
SLAB_MATCH(_unused_slab_obj_exts, obj_exts);
SLAB_MATCH(flags, flags);
SLAB_MATCH(compound_head, slab_cache); /* Ensure bit 0 is clear */
SLAB_MATCH(_refcount, __page_refcount);