[PATCH] slub: Fix sysfs duplicate filename creation when slub_debug=O

[kbuild test robot]

Hi Miles,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on mmotm/master]
[also build test ERROR on v4.14-rc8 next-20171107]
[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/miles-chen-mediatek-com/slub-Fix-sysfs-duplicate-filename-creation-when-slub_debug-O/20171108-100701
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: i386-randconfig-x001-201745 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   mm/slub.c: In function 'sysfs_slab_add':
>> mm/slub.c:5713:18: error: 'SLAB_NEVER_MERGE' undeclared (first use in this function)
       (slub_debug & SLAB_NEVER_MERGE))
                     ^~~~~~~~~~~~~~~~
   mm/slub.c:5713:18: note: each undeclared identifier is reported only once for each function it appears in

vim +/SLAB_NEVER_MERGE +5713 mm/slub.c

  5697	
  5698	static int sysfs_slab_add(struct kmem_cache *s)
  5699	{
  5700		int err;
  5701		const char *name;
  5702		struct kset *kset = cache_kset(s);
  5703		int unmergeable = slab_unmergeable(s);
  5704	
  5705		INIT_WORK(&s->kobj_remove_work, sysfs_slab_remove_workfn);
  5706	
  5707		if (!kset) {
  5708			kobject_init(&s->kobj, &slab_ktype);
  5709			return 0;
  5710		}
  5711	
  5712		if (!unmergeable && disable_higher_order_debug &&
> 5713				(slub_debug & SLAB_NEVER_MERGE))
  5714			unmergeable = 1;
  5715	
  5716		if (unmergeable) {
  5717			/*
  5718			 * Slabcache can never be merged so we can use the name proper.
  5719			 * This is typically the case for debug situations. In that
  5720			 * case we can catch duplicate names easily.
  5721			 */
  5722			sysfs_remove_link(&slab_kset->kobj, s->name);
  5723			name = s->name;
  5724		} else {
  5725			/*
  5726			 * Create a unique name for the slab as a target
  5727			 * for the symlinks.
  5728			 */
  5729			name = create_unique_id(s);
  5730		}
  5731	
  5732		s->kobj.kset = kset;
  5733		err = kobject_init_and_add(&s->kobj, &slab_ktype, NULL, "%s", name);
  5734		if (err)
  5735			goto out;
  5736	
  5737		err = sysfs_create_group(&s->kobj, &slab_attr_group);
  5738		if (err)
  5739			goto out_del_kobj;
  5740	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
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