slab: remove broken PageSlab check from kfree_debugcheck

[Pekka J Enberg <penberg@cs.helsinki.fi>]

From: Pekka Enberg <penberg@cs.helsinki.fi>

The PageSlab debug check in kfree_debugcheck() is broken for compound 
pages.  It is also redundant as we already do BUG_ON for non-slab pages in
page_get_cache() and page_get_slab() which are always called before we 
free any actual objects.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
---

diff --git a/mm/slab.c b/mm/slab.c
index 0d4e574..77d24eb 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2814,19 +2814,11 @@ #if DEBUG
  */
 static void kfree_debugcheck(const void *objp)
 {
-	struct page *page;
-
 	if (!virt_addr_valid(objp)) {
 		printk(KERN_ERR "kfree_debugcheck: out of range ptr %lxh.\n",
 		       (unsigned long)objp);
 		BUG();
 	}
-	page = virt_to_page(objp);
-	if (!PageSlab(page)) {
-		printk(KERN_ERR "kfree_debugcheck: bad ptr %lxh.\n",
-		       (unsigned long)objp);
-		BUG();
-	}
 }
 
 static inline void verify_redzone_free(struct kmem_cache *cache, void *obj)
-
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