SLUB: Do not use page->mapping

After moving the lockless_freelist to kmem_cache_cpu we no longer need
page->lockless_freelist. Restructure the use of the struct page fields in
such a way that we never touch the mapping field.

This is turn allows us to remove the special casing of SLUB when determining
the mapping of a page (needed for corner cases of virtual caches machines that
need to flush caches of processors mapping a page).

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 4 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 6a68d41444f8..292c68623759 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -568,10 +568,6 @@ static inline struct address_space *page_mapping(struct page *page)
         VM_BUG_ON(PageSlab(page));
         if (unlikely(PageSwapCache(page)))
                 mapping = &swapper_space;
-#ifdef CONFIG_SLUB
-        else if (unlikely(PageSlab(page)))
-                mapping = NULL;
-#endif
         else if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON))
                 mapping = NULL;
         return mapping;