slab: fix DEBUG_SLAB warning

In commit c225150b "slab: fix DEBUG_SLAB build",
"if ((unsigned long)objp & (ARCH_SLAB_MINALIGN-1))" is always true if
ARCH_SLAB_MINALIGN == 0. Do not print warning if ARCH_SLAB_MINALIGN == 0.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/mm/slab.c b/mm/slab.c
index c3cb3598555a..dc2f068c0b7d 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3155,7 +3155,8 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep,
         objp += obj_offset(cachep);
         if (cachep->ctor && cachep->flags & SLAB_POISON)
                 cachep->ctor(objp);
-        if ((unsigned long)objp & (ARCH_SLAB_MINALIGN-1)) {
+        if (ARCH_SLAB_MINALIGN &&
+            ((unsigned long)objp & (ARCH_SLAB_MINALIGN-1))) {
                 printk(KERN_ERR "0x%p: not aligned to ARCH_SLAB_MINALIGN=%d\n",
                        objp, (int)ARCH_SLAB_MINALIGN);
         }