Re: [PATCH] mm: workingset: account MGLRU pages in count_shadow_nodes()

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

Hi Hui,

kernel test robot noticed the following build warnings:

[auto build test WARNING on akpm-mm/mm-everything]

url:    https://github.com/intel-lab-lkp/linux/commits/Hui-Zhu/mm-workingset-account-MGLRU-pages-in-count_shadow_nodes/20260824-171630
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20260824091631.836473-1-hui.zhu%40linux.dev
patch subject: [PATCH] mm: workingset: account MGLRU pages in count_shadow_nodes()
config: parisc-randconfig-002-20260825 (https://download.01.org/0day-ci/archive/20260825/202608252128.XbcsGfzh-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 14.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260825/202608252128.XbcsGfzh-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/202608252128.XbcsGfzh-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/workingset.c:657:22: warning: 'count_lru_gen_pages' defined but not used [-Wunused-function]
     657 | static unsigned long count_lru_gen_pages(struct lruvec *lruvec)
         |                      ^~~~~~~~~~~~~~~~~~~


vim +/count_lru_gen_pages +657 mm/workingset.c

   650	
   651	#ifdef CONFIG_LRU_GEN
   652	/*
   653	 * The per-generation counters are eventually consistent and may go
   654	 * transiently negative while batched updates are pending, so clamp
   655	 * the sum at zero.
   656	 */
 > 657	static unsigned long count_lru_gen_pages(struct lruvec *lruvec)
   658	{
   659		struct lru_gen_folio *lrugen = &lruvec->lrugen;
   660		long nr_pages = 0;
   661		int gen, type, zone;
   662	
   663		if (!lrugen->enabled)
   664			return 0;
   665	
   666		for (gen = 0; gen < MAX_NR_GENS; gen++) {
   667			for (type = 0; type < ANON_AND_FILE; type++) {
   668				long *cnt = lrugen->nr_pages[gen][type];
   669	
   670				for (zone = 0; zone < MAX_NR_ZONES; zone++)
   671					nr_pages += READ_ONCE(cnt[zone]);
   672			}
   673		}
   674	
   675		if (nr_pages <= 0)
   676			return 0;
   677	
   678		return nr_pages;
   679	}
   680	#endif
   681	

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