Re: [RFC PATCH] mm: vmscan: avoid anon scanning for GFP_NOIO with low swapcache

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

Hi Bo,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

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

url:    https://github.com/intel-lab-lkp/linux/commits/Bo-Zhang/mm-vmscan-avoid-anon-scanning-for-GFP_NOIO-with-low-swapcache/20260903-120131
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20260903040131.4016290-1-zhangbo56%40xiaomi.com
patch subject: [RFC PATCH] mm: vmscan: avoid anon scanning for GFP_NOIO with low swapcache
config: arc-allnoconfig (https://download.01.org/0day-ci/archive/20260906/202609060948.O3LniW01-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260906/202609060948.O3LniW01-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/202609060948.O3LniW01-lkp@intel.com/

All errors (new ones prefixed by >>):

   mm/vmscan.c: In function 'reclaimable_anon_is_low':
>> mm/vmscan.c:396:47: error: 'NR_SWAPCACHE' undeclared (first use in this function)
     396 |         swapcache = lruvec_page_state(lruvec, NR_SWAPCACHE);
         |                                               ^~~~~~~~~~~~
   mm/vmscan.c:396:47: note: each undeclared identifier is reported only once for each function it appears in


vim +/NR_SWAPCACHE +396 mm/vmscan.c

   384	
   385	static inline bool reclaimable_anon_is_low(struct mem_cgroup *memcg,
   386			int nid, struct scan_control *sc)
   387	{
   388		struct lruvec *lruvec = get_lruvec(memcg, nid);
   389		unsigned long anon_pages, swapcache;
   390	
   391		if (!sc || (sc->gfp_mask & __GFP_IO))
   392			return false;
   393	
   394		anon_pages = lruvec_page_state(lruvec, NR_INACTIVE_ANON) +
   395			     lruvec_page_state(lruvec, NR_ACTIVE_ANON);
 > 396		swapcache = lruvec_page_state(lruvec, NR_SWAPCACHE);
   397	
   398		return swapcache < min(anon_pages >> 6, SWAP_CLUSTER_MAX);
   399	}
   400	

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