Re: [PATCH] mm/vmstat: reject zero vm.stat_interval to prevent busy-loop

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

Hi Maximilian,

kernel test robot noticed the following build warnings:

[auto build test WARNING on af4e9ef3d78420feb8fe58cd9a1ab80c501b3c08]

url:    https://github.com/intel-lab-lkp/linux/commits/Maximilian-Pezzullo-via-B4-Relay/mm-vmstat-reject-zero-vm-stat_interval-to-prevent-busy-loop/20260304-153052
base:   af4e9ef3d78420feb8fe58cd9a1ab80c501b3c08
patch link:    https://lore.kernel.org/r/20260304-mm-vmstat-reject-zero-vm-stat_interval-to-prevent-busy-loop-v1-1-c03c9555ff15%40gmail.com
patch subject: [PATCH] mm/vmstat: reject zero vm.stat_interval to prevent busy-loop
config: parisc-randconfig-002-20260305 (https://download.01.org/0day-ci/archive/20260305/202603050819.oMnaHoIC-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260305/202603050819.oMnaHoIC-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/202603050819.oMnaHoIC-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/vmstat.c:2117:12: warning: 'vmstat_interval_handler' defined but not used [-Wunused-function]
    static int vmstat_interval_handler(const struct ctl_table *table, int write,
               ^~~~~~~~~~~~~~~~~~~~~~~


vim +/vmstat_interval_handler +2117 mm/vmstat.c

  2116	
> 2117	static int vmstat_interval_handler(const struct ctl_table *table, int write,
  2118					    void *buffer, size_t *lenp, loff_t *ppos)
  2119	{
  2120		int ret = proc_dointvec_jiffies(table, write, buffer, lenp, ppos);
  2121	
  2122		if (ret == 0 && write && sysctl_stat_interval == 0) {
  2123			sysctl_stat_interval = HZ;
  2124			return -EINVAL;
  2125		}
  2126		return ret;
  2127	}
  2128	

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