[PATCH 15/22] slab: Remove folio references from build_detached_freelist()

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

As with memcg_slab_post_charge(), we save a call to compound_head() for
large kmallocs.  This has a slight change of behaviour in that non-slab,
non-kmalloc pointers will now cause a NULL pointer dereference rather
than a warning.  We could add that back if really needed.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 mm/slub.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index f31206e5c89a..af3e7ef30b5d 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -6633,23 +6633,23 @@ int build_detached_freelist(struct kmem_cache *s, size_t size,
 {
 	int lookahead = 3;
 	void *object;
-	struct folio *folio;
+	struct page *page;
 	size_t same;
 
 	object = p[--size];
-	folio = virt_to_folio(object);
+	page = virt_to_page(object);
 	if (!s) {
 		/* Handle kalloc'ed objects */
-		if (unlikely(!folio_test_slab(folio))) {
-			free_large_kmalloc(&folio->page, object);
+		if (unlikely(PageLargeKmalloc(page))) {
+			free_large_kmalloc(page, object);
 			df->slab = NULL;
 			return size;
 		}
 		/* Derive kmem_cache from object */
-		df->slab = folio_slab(folio);
+		df->slab = page_slab(page);
 		df->s = df->slab->slab_cache;
 	} else {
-		df->slab = folio_slab(folio);
+		df->slab = page_slab(page);
 		df->s = cache_from_obj(s, object); /* Support for memcg */
 	}
 
-- 
2.47.2