tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   c64429bcc60a702f19f5cfdb5c39277863278a8c
commit: 5107bbaaea3690d18d8e36523a3f6c22050d2708 [201/417] slab: link memcg caches of the same kind into a list
config: x86_64-allnoconfig (attached as .config)
reproduce:
  git checkout 5107bbaaea3690d18d8e36523a3f6c22050d2708
  # save the attached .config to linux build tree
  make ARCH=x86_64 

All 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:603:2: note: in expansion of macro 'for_each_memcg_cache_safe'
     for_each_memcg_cache_safe(c, c2, 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) {
      ^

vim +259 mm/slab.h

   251	
   252	extern void slab_init_memcg_params(struct kmem_cache *);
   253	
   254	#else /* !CONFIG_MEMCG_KMEM */
   255	
   256	#define for_each_memcg_cache(iter, root) \
 > 257		for (iter = NULL, (root); 0; )
   258	#define for_each_memcg_cache_safe(iter, tmp, root) \
 > 259		for (iter = NULL, tmp = NULL, (root); 0; )
   260	
   261	static inline bool is_root_cache(struct kmem_cache *s)
   262	{

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