Add virt_to_head_page and consolidate code in slab and slub

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, 4 insertions, 6 deletions

diff --git a/mm/slub.c b/mm/slub.c
index 8fa1c6e937f5..347c11e80d8e 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1323,9 +1323,7 @@ void kmem_cache_free(struct kmem_cache *s, void *x)
 {
         struct page * page;
 
-        page = virt_to_page(x);
-
-        page = compound_head(page);
+        page = virt_to_head_page(x);
 
         if (unlikely(PageError(page) && (s->flags & SLAB_STORE_USER)))
                 set_tracking(s, x, TRACK_FREE);
@@ -1336,7 +1334,7 @@ EXPORT_SYMBOL(kmem_cache_free);
 /* Figure out on which slab object the object resides */
 static struct page *get_object_page(const void *x)
 {
-        struct page *page = compound_head(virt_to_page(x));
+        struct page *page = virt_to_head_page(x);
 
         if (!PageSlab(page))
                 return NULL;
@@ -2076,7 +2074,7 @@ void kfree(const void *x)
         if (!x)
                 return;
 
-        page = compound_head(virt_to_page(x));
+        page = virt_to_head_page(x);
 
         s = page->slab;
 
@@ -2112,7 +2110,7 @@ void *krealloc(const void *p, size_t new_size, gfp_t flags)
                 return NULL;
         }
 
-        page = compound_head(virt_to_page(p));
+        page = virt_to_head_page(p);
 
         new_cache = get_slab(new_size, flags);