linux-kernel - Re: [PATCH] mm: fix race between kmem_cache destroy, create and deactivate

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Date:   Wed, 23 May 2018 05:14:36 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     kbuild-all@...org, Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Thelen <gthelen@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Tejun Heo <tj@...nel.org>, Linux MM <linux-mm@...ck.org>,
        cgroups@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Shakeel Butt <shakeelb@...gle.com>
Subject: Re: [PATCH] mm: fix race between kmem_cache destroy, create and
 deactivate

Hi Shakeel,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on mmotm/master]
[also build test ERROR on v4.17-rc6 next-20180517]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Shakeel-Butt/mm-fix-race-between-kmem_cache-destroy-create-and-deactivate/20180523-041715
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: i386-randconfig-x009-201820 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   mm/slub.c: In function '__kmem_cache_alias':
>> mm/slub.c:4251:4: error: implicit declaration of function 'kmem_cache_put_locked'; did you mean 'kmem_cache_init_late'? [-Werror=implicit-function-declaration]
       kmem_cache_put_locked(s);
       ^~~~~~~~~~~~~~~~~~~~~
       kmem_cache_init_late
   cc1: some warnings being treated as errors

vim +4251 mm/slub.c

  4226	
  4227	struct kmem_cache *
  4228	__kmem_cache_alias(const char *name, unsigned int size, unsigned int align,
  4229			   slab_flags_t flags, void (*ctor)(void *))
  4230	{
  4231		struct kmem_cache *s, *c;
  4232	
  4233		s = find_mergeable(size, align, flags, name, ctor);
  4234		if (s && kmem_cache_tryget(s)) {
  4235			s->alias_count++;
  4236	
  4237			/*
  4238			 * Adjust the object sizes so that we clear
  4239			 * the complete object on kzalloc.
  4240			 */
  4241			s->object_size = max(s->object_size, size);
  4242			s->inuse = max(s->inuse, ALIGN(size, sizeof(void *)));
  4243	
  4244			for_each_memcg_cache(c, s) {
  4245				c->object_size = s->object_size;
  4246				c->inuse = max(c->inuse, ALIGN(size, sizeof(void *)));
  4247			}
  4248	
  4249			if (sysfs_slab_alias(s, name)) {
  4250				s->alias_count--;
> 4251				kmem_cache_put_locked(s);
  4252				s = NULL;
  4253			}
  4254		}
  4255	
  4256		return s;
  4257	}
  4258	

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