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, 2 deletions

diff --git a/mm/slub.c b/mm/slub.c
index 4b8037f14fce..aa8bb072651b 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1127,7 +1127,6 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node)
         set_freepointer(s, last, NULL);
 
         page->freelist = start;
-        page->lockless_freelist = NULL;
         page->inuse = 0;
 out:
         if (flags & __GFP_WAIT)
@@ -1153,7 +1152,6 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
                 NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
                 - pages);
 
-        page->mapping = NULL;
         __free_pages(page, s->order);
 }