Subject: linux-next: build warnings after merge of the akpm-current tree

From: Stephen Rothwell <[email-masked]>
Date: Tue, 27 Jan 2015 19:12:43 +1100

Hi Andrew,

After merging the akpm-current tree, today's linux-next build (powerpc
ppc64_defconfig) produced these warnings:

In file included from mm/slab_common.c:26:0:
mm/slab_common.c: In function 'kmem_cache_destroy':
mm/slab.h:259:30: warning: right-hand operand of comma expression has no effect [-Wunused-value]
  for (iter = NULL, tmp = NULL, (root); 0; )
                              ^
mm/slab_common.c:620:2: note: in expansion of macro 'for_each_memcg_cache_safe'
  for_each_memcg_cache_safe(c, c2, s) {
  ^
mm/slab_common.c: In function 'memcg_accumulate_slabinfo':
mm/slab.h:257:18: warning: right-hand operand of comma expression has no effect [-Wunused-value]
  for (iter = NULL, (root); 0; )
                  ^
mm/slab_common.c:959:2: note: in expansion of macro 'for_each_memcg_cache'
  for_each_memcg_cache(c, s) {
  ^
In file included from mm/slub.c:19:0:
mm/slub.c: In function '__kmem_cache_alias':
mm/slab.h:257:18: warning: right-hand operand of comma expression has no effect [-Wunused-value]
  for (iter = NULL, (root); 0; )
                  ^
mm/slub.c:3652:3: note: in expansion of macro 'for_each_memcg_cache'
   for_each_memcg_cache(c, s) {
   ^

Introduced by commit 3019931a000b ("slab: link memcg caches of the same
kind into a list").

-- 
Cheers,
Stephen Rothwell                    [email-masked]