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: sparc-defconfig (attached as .config)
reproduce:
  wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
  chmod +x ~/bin/make.cross
  git checkout 5107bbaaea3690d18d8e36523a3f6c22050d2708
  # save the attached .config to linux build tree
  make.cross ARCH=sparc 

All warnings:

   In file included from mm/slab.c:130:0:
   mm/slab.c: In function 'do_tune_cpucache':
   mm/slab.h:257:18: warning: right-hand operand of comma expression has no effect [-Wunused-value]
     for (iter = NULL, (root); 0; )
                     ^
>> mm/slab.c:3722:2: note: in expansion of macro 'for_each_memcg_cache'
     for_each_memcg_cache(c, cachep) {
     ^
--
   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) {
     ^
   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:942:2: note: in expansion of macro 'for_each_memcg_cache'
     for_each_memcg_cache(c, s) {
     ^

vim +/for_each_memcg_cache +3722 mm/slab.c

  3706	
  3707	static int do_tune_cpucache(struct kmem_cache *cachep, int limit,
  3708					int batchcount, int shared, gfp_t gfp)
  3709	{
  3710		int ret;
  3711		struct kmem_cache *c;
  3712	
  3713		ret = __do_tune_cpucache(cachep, limit, batchcount, shared, gfp);
  3714	
  3715		if (slab_state < FULL)
  3716			return ret;
  3717	
  3718		if ((ret < 0) || !is_root_cache(cachep))
  3719			return ret;
  3720	
  3721		lockdep_assert_held(&slab_mutex);
> 3722		for_each_memcg_cache(c, cachep) {
  3723			/* return value determined by the root cache only */
  3724			__do_tune_cpucache(c, limit, batchcount, shared, gfp);
  3725		}
  3726	
  3727		return ret;
  3728	}
  3729	
  3730	/* Called with slab_mutex held always */

---
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