Re: [PATCH] mm/vmstat: reject invalid stat_interval values

Re: [PATCH] mm/vmstat: reject invalid stat_interval values

[kernel test robot]

Hi Cao,

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/Cao-Ruichuang/mm-vmstat-reject-invalid-stat_interval-values/20260411-085547
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20260410112554.23165-1-create0818%40163.com
patch subject: [PATCH] mm/vmstat: reject invalid stat_interval values
config: arm-randconfig-004-20260411 (https://download.01.org/0day-ci/archive/20260411/202604111816.CsqTatIh-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project ae825cb8cea7f3ac8e5e4096f22713845cf5e501)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260411/202604111816.CsqTatIh-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/202604111816.CsqTatIh-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/vmstat.c:1968:18: warning: unused variable 'sysctl_stat_interval_max' [-Wunused-const-variable]
    1968 | static const int sysctl_stat_interval_max = INT_MAX / HZ;
         |                  ^~~~~~~~~~~~~~~~~~~~~~~~
   1 warning generated.


vim +/sysctl_stat_interval_max +1968 mm/vmstat.c

  1964	
  1965	#ifdef CONFIG_SMP
  1966	static DEFINE_PER_CPU(struct delayed_work, vmstat_work);
  1967	static int sysctl_stat_interval __read_mostly = HZ;
> 1968	static const int sysctl_stat_interval_max = INT_MAX / HZ;
  1969	static int vmstat_late_init_done;
  1970	

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