Re: [PATCH v4] mm: slub: move sysfs slab alloc/free interfaces to debugfs

[kernel test robot]

Hi Faiyaz,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.12-rc7]
[cannot apply to hnaz-linux-mm/master next-20210416]
[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/20210416-222940
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 7e25f40eab52c57ff6772d27d2aef3640a3237d7
config: mips-randconfig-r001-20210416 (attached as .config)
compiler: mips64el-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/8adf70f166344443e2f4e689e30c5d20f16b234e
        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/20210416-222940
        git checkout 8adf70f166344443e2f4e689e30c5d20f16b234e
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=mips 

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

All errors (new ones prefixed by >>):

   mm/slab_common.c: In function 'slab_caches_to_rcu_destroy_workfn':
>> mm/slab_common.c:441:3: error: implicit declaration of function 'debugfs_slab_release' [-Werror=implicit-function-declaration]
     441 |   debugfs_slab_release(s);
         |   ^~~~~~~~~~~~~~~~~~~~
   At top level:
   mm/slab_common.c:1124:30: warning: 'slabinfo_proc_ops' defined but not used [-Wunused-const-variable=]
    1124 | static const struct proc_ops slabinfo_proc_ops = {
         |                              ^~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/debugfs_slab_release +441 mm/slab_common.c

   409	
   410	static void slab_caches_to_rcu_destroy_workfn(struct work_struct *work)
   411	{
   412		LIST_HEAD(to_destroy);
   413		struct kmem_cache *s, *s2;
   414	
   415		/*
   416		 * On destruction, SLAB_TYPESAFE_BY_RCU kmem_caches are put on the
   417		 * @slab_caches_to_rcu_destroy list.  The slab pages are freed
   418		 * through RCU and the associated kmem_cache are dereferenced
   419		 * while freeing the pages, so the kmem_caches should be freed only
   420		 * after the pending RCU operations are finished.  As rcu_barrier()
   421		 * is a pretty slow operation, we batch all pending destructions
   422		 * asynchronously.
   423		 */
   424		mutex_lock(&slab_mutex);
   425		list_splice_init(&slab_caches_to_rcu_destroy, &to_destroy);
   426		mutex_unlock(&slab_mutex);
   427	
   428		if (list_empty(&to_destroy))
   429			return;
   430	
   431		rcu_barrier();
   432	
   433		list_for_each_entry_safe(s, s2, &to_destroy, list) {
   434			kfence_shutdown_cache(s);
   435	#ifdef SLAB_SUPPORTS_SYSFS
   436			sysfs_slab_release(s);
   437	#else
   438			slab_kmem_cache_release(s);
   439	#endif
   440	#ifdef CONFIG_DEBUG_FS
 > 441			debugfs_slab_release(s);
   442	#endif
   443		}
   444	}
   445	

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

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