Re: [PATCH] mm/slab: fix race with dereferencing NULL ptr in alloc_calls_show

[kbuild test robot]

Hi Dmitry,

[auto build test ERROR on v4.5-rc2]
[also build test ERROR on next-20160201]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Dmitry-Safonov/mm-slab-fix-race-with-dereferencing-NULL-ptr-in-alloc_calls_show/20160202-230449
config: i386-randconfig-x005-02010231 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   mm/slab_common.c: In function 'memcg_destroy_kmem_caches':
>> mm/slab_common.c:613:3: error: implicit declaration of function 'sysfs_slab_remove' [-Werror=implicit-function-declaration]
      sysfs_slab_remove(s);
      ^
   cc1: some warnings being treated as errors

vim +/sysfs_slab_remove +613 mm/slab_common.c

   607	
   608		mutex_lock(&slab_mutex);
   609		list_for_each_entry_safe(s, s2, &slab_caches, list) {
   610			if (is_root_cache(s) || s->memcg_params.memcg != memcg)
   611				continue;
   612	
 > 613			sysfs_slab_remove(s);
   614	
   615			/*
   616			 * The cgroup is about to be freed and therefore has no charges

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