linux-kernel - Re: [PATCH v8] mm: slub: move sysfs slab alloc/free interfaces to debugfs

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Date:   Tue, 1 Jun 2021 19:08:01 +0800
From:   kernel test robot <lkp@...el.com>
To:     Faiyaz Mohammed <faiyazm@...eaurora.org>, cl@...ux.com,
        penberg@...nel.org, rientjes@...gle.com, iamjoonsoo.kim@....com,
        akpm@...ux-foundation.org, vbabka@...e.cz, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, greg@...ah.com, glittao@...il.com
Cc:     kbuild-all@...ts.01.org
Subject: Re: [PATCH v8] mm: slub: move sysfs slab alloc/free interfaces to
 debugfs

Hi Faiyaz,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.13-rc4]
[cannot apply to hnaz-linux-mm/master next-20210601]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Faiyaz-Mohammed/mm-slub-move-sysfs-slab-alloc-free-interfaces-to-debugfs/20210601-180903
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git c2131f7e73c9e9365613e323d65c7b9e5b910f56
config: i386-tinyconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/9540acc4691d680b7124d8daa1a2eb98a97ee19a
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Faiyaz-Mohammed/mm-slub-move-sysfs-slab-alloc-free-interfaces-to-debugfs/20210601-180903
        git checkout 9540acc4691d680b7124d8daa1a2eb98a97ee19a
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   mm/slab_common.c: In function 'slab_caches_to_rcu_destroy_workfn':
>> mm/slab_common.c:452:3: error: implicit declaration of function 'debugfs_slab_release' [-Werror=implicit-function-declaration]
     452 |   debugfs_slab_release(s);
         |   ^~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/debugfs_slab_release +452 mm/slab_common.c

   427	
   428	static void slab_caches_to_rcu_destroy_workfn(struct work_struct *work)
   429	{
   430		LIST_HEAD(to_destroy);
   431		struct kmem_cache *s, *s2;
   432	
   433		/*
   434		 * On destruction, SLAB_TYPESAFE_BY_RCU kmem_caches are put on the
   435		 * @slab_caches_to_rcu_destroy list.  The slab pages are freed
   436		 * through RCU and the associated kmem_cache are dereferenced
   437		 * while freeing the pages, so the kmem_caches should be freed only
   438		 * after the pending RCU operations are finished.  As rcu_barrier()
   439		 * is a pretty slow operation, we batch all pending destructions
   440		 * asynchronously.
   441		 */
   442		mutex_lock(&slab_mutex);
   443		list_splice_init(&slab_caches_to_rcu_destroy, &to_destroy);
   444		mutex_unlock(&slab_mutex);
   445	
   446		if (list_empty(&to_destroy))
   447			return;
   448	
   449		rcu_barrier();
   450	
   451		list_for_each_entry_safe(s, s2, &to_destroy, list) {
 > 452			debugfs_slab_release(s);
   453			kfence_shutdown_cache(s);
   454	#ifdef SLAB_SUPPORTS_SYSFS
   455			sysfs_slab_release(s);
   456	#else
   457			slab_kmem_cache_release(s);
   458	#endif
   459		}
   460	}
   461	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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