Re: [PATCH v4 1/4] mm: swap: introduce swap tier infrastructure

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

Hi Youngjun,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 776250964cbaa49ebe6b8bb2870765cc89cece59]

url:    https://github.com/intel-lab-lkp/linux/commits/Youngjun-Park/mm-swap-introduce-swap-tier-infrastructure/20260217-121406
base:   776250964cbaa49ebe6b8bb2870765cc89cece59
patch link:    https://lore.kernel.org/r/20260217000950.4015880-2-youngjun.park%40lge.com
patch subject: [PATCH v4 1/4] mm: swap: introduce swap tier infrastructure
config: hexagon-randconfig-002-20260217 (https://download.01.org/0day-ci/archive/20260217/202602172319.SHQ7btgd-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project e86750b29fa0ff207cd43213d66dabe565417638)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260217/202602172319.SHQ7btgd-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/202602172319.SHQ7btgd-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/swap_tier.c:118:10: warning: format specifies type 'long' but the argument has type '__ptrdiff_t' (aka 'int') [-Wformat]
     116 |                 len += sysfs_emit_at(buf, len, "%-16s %-5ld %-11d %-11d\n",
         |                                                       ~~~~~
         |                                                       %-5td
     117 |                                      tier->name,
     118 |                                      TIER_IDX(tier),
         |                                      ^~~~~~~~~~~~~~
   mm/swap_tier.c:33:24: note: expanded from macro 'TIER_IDX'
      33 | #define TIER_IDX(tier)  ((tier) - swap_tiers)
         |                         ^~~~~~~~~~~~~~~~~~~~~
   1 warning generated.


vim +118 mm/swap_tier.c

   105	
   106	ssize_t swap_tiers_sysfs_show(char *buf)
   107	{
   108		struct swap_tier *tier;
   109		ssize_t len = 0;
   110	
   111		len += sysfs_emit_at(buf, len, "%-16s %-5s %-11s %-11s\n",
   112				 "Name", "Idx", "PrioStart", "PrioEnd");
   113	
   114		spin_lock(&swap_tier_lock);
   115		for_each_active_tier(tier) {
   116			len += sysfs_emit_at(buf, len, "%-16s %-5ld %-11d %-11d\n",
   117					     tier->name,
 > 118					     TIER_IDX(tier),
   119					     tier->prio,
   120					     TIER_END_PRIO(tier));
   121		}
   122		spin_unlock(&swap_tier_lock);
   123	
   124		return len;
   125	}
   126	

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