[PATCH 08/10] slub: Remove use of page->flags

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

Use slub->__page_flags instead.  We can also remove the assertion that
it's not a tail page as struct slab never points to a tail page.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 mm/slub.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index ceee8d76e1a9..1500546a9b68 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -616,18 +616,12 @@ slub_set_cpu_partial(struct kmem_cache *s, unsigned int nr_objects)
  */
 static __always_inline void slab_lock(struct slab *slab)
 {
-	struct page *page = slab_page(slab);
-
-	VM_BUG_ON_PAGE(PageTail(page), page);
-	bit_spin_lock(PG_locked, &page->flags);
+	bit_spin_lock(PG_locked, &slab->__page_flags);
 }
 
 static __always_inline void slab_unlock(struct slab *slab)
 {
-	struct page *page = slab_page(slab);
-
-	VM_BUG_ON_PAGE(PageTail(page), page);
-	bit_spin_unlock(PG_locked, &page->flags);
+	bit_spin_unlock(PG_locked, &slab->__page_flags);
 }
 
 static inline bool
-- 
2.43.0