SLUB: Clean up krealloc

We really do not need all this gaga there.

ksize gives us all the information we need to figure out
if the object can cope with the new size.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

---
 mm/slub.c |   15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

Index: slub/mm/slub.c
===================================================================
--- slub.orig/mm/slub.c	2007-05-07 13:52:47.000000000 -0700
+++ slub/mm/slub.c	2007-05-07 13:52:51.000000000 -0700
@@ -2206,9 +2206,8 @@ EXPORT_SYMBOL(kmem_cache_shrink);
  */
 void *krealloc(const void *p, size_t new_size, gfp_t flags)
 {
-	struct kmem_cache *new_cache;
 	void *ret;
-	struct page *page;
+	unsigned long ks;
 
 	if (unlikely(!p))
 		return kmalloc(new_size, flags);
@@ -2218,19 +2217,13 @@ void *krealloc(const void *p, size_t new
 		return NULL;
 	}
 
-	page = virt_to_head_page(p);
-
-	new_cache = get_slab(new_size, flags);
-
-	/*
- 	 * If new size fits in the current cache, bail out.
- 	 */
-	if (likely(page->slab == new_cache))
+	ks = ksize(p);
+	if (ks >= new_size)
 		return (void *)p;
 
 	ret = kmalloc(new_size, flags);
 	if (ret) {
-		memcpy(ret, p, min(new_size, ksize(p)));
+		memcpy(ret, p, min(new_size, ks));
 		kfree(p);
 	}
 	return ret;