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In the future, we will separate slab, folio and page from each other and calling virt_to_folio() on an address allocated from slab will return NULL. Delay the conversion from struct page to struct slab until we know we're not dealing with a large kmalloc allocation. There's a minor win for large kmalloc allocations as we avoid the compound_head() hidden in virt_to_folio(). This deprecates calling ksize() on memory allocated by alloc_pages(). Today it becomes a warning and support will be removed entirely in the future. Introduce large_kmalloc_size() to abstract how we represent the size of a large kmalloc allocation. For now, this is the same as page_size(), but it will change with separately allocated memdescs. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Link: https://patch.msgid.link/20251113000932.1589073-3-willy@infradead.org Acked-by: David Hildenbrand (Red Hat) <david@kernel.org> Reviewed-by: Harry Yoo <harry.yoo@oracle.com> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>