Re: [PATCH 8/8] mm/vmstat, memcontrol: Track ZSWAP_B, ZSWAPPED_B per-memcg-lruvec

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

Hi Joshua,

kernel test robot noticed the following build errors:

[auto build test ERROR on axboe/for-next]
[also build test ERROR on linus/master v7.0-rc1]
[cannot apply to akpm-mm/mm-everything next-20260226]
[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/Joshua-Hahn/mm-zsmalloc-Rename-zs_object_copy-to-zs_obj_copy/20260227-033239
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux.git for-next
patch link:    https://lore.kernel.org/r/20260226192936.3190275-9-joshua.hahnjy%40gmail.com
patch subject: [PATCH 8/8] mm/vmstat, memcontrol: Track ZSWAP_B, ZSWAPPED_B per-memcg-lruvec
config: powerpc64-randconfig-r072-20260227 (https://download.01.org/0day-ci/archive/20260227/202602270607.dJP65LGH-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
smatch version: v0.5.0-8994-gd50c5a4c
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260227/202602270607.dJP65LGH-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/202602270607.dJP65LGH-lkp@intel.com/

All errors (new ones prefixed by >>):

>> mm/zsmalloc.c:813:17: error: call to undeclared function 'zpdesc_objcgs'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     813 |         bool objcg = !!zpdesc_objcgs(zspage->first_zpdesc);
         |                        ^
   1 error generated.


vim +/zpdesc_objcgs +813 mm/zsmalloc.c

   808	
   809	static void __free_zspage(struct zs_pool *pool, struct size_class *class,
   810					struct zspage *zspage)
   811	{
   812		struct zpdesc *zpdesc, *next;
 > 813		bool objcg = !!zpdesc_objcgs(zspage->first_zpdesc);
   814	
   815		assert_spin_locked(&class->lock);
   816	
   817		VM_BUG_ON(get_zspage_inuse(zspage));
   818		VM_BUG_ON(zspage->fullness != ZS_INUSE_RATIO_0);
   819	
   820		next = zpdesc = get_first_zpdesc(zspage);
   821		do {
   822			VM_BUG_ON_PAGE(!zpdesc_is_locked(zpdesc), zpdesc_page(zpdesc));
   823			next = get_next_zpdesc(zpdesc);
   824			reset_zpdesc(zpdesc);
   825			zpdesc_unlock(zpdesc);
   826			zpdesc_dec_zone_page_state(zpdesc);
   827			if (objcg)
   828				dec_node_page_state(zpdesc_page(zpdesc), NR_ZSWAP_B);
   829			zpdesc_put(zpdesc);
   830			zpdesc = next;
   831		} while (zpdesc != NULL);
   832	
   833		cache_free_zspage(zspage);
   834	
   835		class_stat_sub(class, ZS_OBJS_ALLOCATED, class->objs_per_zspage);
   836		atomic_long_sub(class->pages_per_zspage, &pool->pages_allocated);
   837	}
   838	

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