slab: use well-defined macro, virt_to_slab()

This is trivial change, just use well-defined macro.

Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Pekka Enberg <penberg@iki.fi>

diff --git a/mm/slab.c b/mm/slab.c
index 84c4ed62c10da486e3eec04a99f8f4ec407d6e12..f9e676edeb0f32e2be54a96309d6b58ba25d44c8 100644 (file)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2865,7 +2865,6 @@ static inline void verify_redzone_free(struct kmem_cache *cache, void *obj)
 static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp,
                                   unsigned long caller)
 {
-       struct page *page;
        unsigned int objnr;
        struct slab *slabp;
 
@@ -2873,9 +2872,7 @@ static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp,
 
        objp -= obj_offset(cachep);
        kfree_debugcheck(objp);
-       page = virt_to_head_page(objp);
-
-       slabp = page->slab_page;
+       slabp = virt_to_slab(objp);
 
        if (cachep->flags & SLAB_RED_ZONE) {
                verify_redzone_free(cachep, objp);
@@ -3087,7 +3084,7 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep,
                struct slab *slabp;
                unsigned objnr;
 
-               slabp = virt_to_head_page(objp)->slab_page;
+               slabp = virt_to_slab(objp);
                objnr = (unsigned)(objp - slabp->s_mem) / cachep->size;
                slab_bufctl(slabp)[objnr] = BUFCTL_ACTIVE;
        }