Re: [PATCH v1] memcg: add charging of already allocated slab objects

[kernel test robot <lkp@intel.com>]

Hi Shakeel,

kernel test robot noticed the following build errors:

[auto build test ERROR on akpm-mm/mm-everything]
[also build test ERROR on linus/master v6.11-rc5 next-20240827]
[cannot apply to vbabka-slab/for-next]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Shakeel-Butt/memcg-add-charging-of-already-allocated-slab-objects/20240827-073150
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20240826232908.4076417-1-shakeel.butt%40linux.dev
patch subject: [PATCH v1] memcg: add charging of already allocated slab objects
config: s390-allnoconfig (https://download.01.org/0day-ci/archive/20240827/202408272341.k4cl3jz0-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 08e5a1de8227512d4774a534b91cb2353cef6284)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240827/202408272341.k4cl3jz0-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202408272341.k4cl3jz0-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from mm/slub.c:13:
   In file included from include/linux/mm.h:2198:
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   In file included from mm/slub.c:49:
   In file included from mm/internal.h:13:
   include/linux/mm_inline.h:47:41: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
      47 |         __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages);
         |                                    ~~~~~~~~~~~ ^ ~~~
   include/linux/mm_inline.h:49:22: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
      49 |                                 NR_ZONE_LRU_BASE + lru, nr_pages);
         |                                 ~~~~~~~~~~~~~~~~ ^ ~~~
>> mm/slub.c:4115:31: error: no member named 'objcg' in 'struct slabobj_ext'
    4115 |                 if (unlikely(slab_exts[off].objcg))
         |                              ~~~~~~~~~~~~~~ ^
   include/linux/compiler.h:77:42: note: expanded from macro 'unlikely'
      77 | # define unlikely(x)    __builtin_expect(!!(x), 0)
         |                                             ^
   3 warnings and 1 error generated.


vim +4115 mm/slub.c

  4085	
  4086	#define KMALLOC_TYPE (SLAB_KMALLOC | SLAB_CACHE_DMA | \
  4087			      SLAB_ACCOUNT | SLAB_RECLAIM_ACCOUNT)
  4088	
  4089	bool kmem_cache_charge(void *objp, gfp_t gfpflags)
  4090	{
  4091		struct slabobj_ext *slab_exts;
  4092		struct kmem_cache *s;
  4093		struct folio *folio;
  4094		struct slab *slab;
  4095		unsigned long off;
  4096	
  4097		if (!memcg_kmem_online())
  4098			return true;
  4099	
  4100		folio = virt_to_folio(objp);
  4101		if (unlikely(!folio_test_slab(folio)))
  4102			return false;
  4103	
  4104		slab = folio_slab(folio);
  4105		s = slab->slab_cache;
  4106	
  4107		/* Ignore KMALLOC_NORMAL cache to avoid circular dependency. */
  4108		if ((s->flags & KMALLOC_TYPE) == SLAB_KMALLOC)
  4109			return true;
  4110	
  4111		/* Ignore already charged objects. */
  4112		slab_exts = slab_obj_exts(slab);
  4113		if (slab_exts) {
  4114			off = obj_to_index(s, slab, objp);
> 4115			if (unlikely(slab_exts[off].objcg))
  4116				return true;
  4117		}
  4118	
  4119		return memcg_slab_post_charge(s, objp, gfpflags);
  4120	}
  4121	EXPORT_SYMBOL(kmem_cache_charge);
  4122	

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