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

kernel test robot
2026-04-11T10:34:31Z

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: s390-randconfig-001-20260411 (https://download.01.org/0day-ci/archive/20260411/202604111811.THSgZ1ry-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260411/202604111811.THSgZ1ry-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/202604111811.THSgZ1ry-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/vmstat.c:1968:18: warning: 'sysctl_stat_interval_max' defined but not used [-Wunused-const-variable=]
static const int sysctl_stat_interval_max = INT_MAX / HZ;
^~~~~~~~~~~~~~~~~~~~~~~~

Kconfig warnings: (for reference only)
WARNING: unmet direct dependencies detected for OF_GPIO
Depends on [n]: GPIOLIB [=y] && OF [=y] && HAS_IOMEM [=n]
Selected by [y]:
- REGULATOR_RT5133 [=y] && REGULATOR [=y] && I2C [=y] && GPIOLIB [=y] && OF [=y]

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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