Hi Oleksandr, kernel test robot noticed the following build warnings: [auto build test WARNING on westeri-thunderbolt/next] [also build test WARNING on linus/master v6.11-rc7 next-20240912] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Oleksandr-Ocheretnyi/iTCO_wdt-mask-NMI_NOW-bit-for-update_no_reboot_bit-call/20240912-222231 base: https://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt.git next patch link: https://lore.kernel.org/r/20240912141931.2447826-1-oocheret%40cisco.com patch subject: [PATCH v2] iTCO_wdt: mask NMI_NOW bit for update_no_reboot_bit() call config: i386-buildonly-randconfig-003-20240913 (https://download.01.org/0day-ci/archive/20240913/202409131302.oGABipcM-lkp@xxxxxxxxx/config) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240913/202409131302.oGABipcM-lkp@xxxxxxxxx/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@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202409131302.oGABipcM-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): drivers/watchdog/iTCO_wdt.c: In function 'update_no_reboot_bit_cnt': >> drivers/watchdog/iTCO_wdt.c:226:33: warning: conversion from 'long unsigned int' to 'u16' {aka 'short unsigned int'} changes value from '4294967039' to '65279' [-Woverflow] 226 | u16 val, newval, mask = (~NMI_NOW); | ^ vim +226 drivers/watchdog/iTCO_wdt.c 222 223 static int update_no_reboot_bit_cnt(void *priv, bool set) 224 { 225 struct iTCO_wdt_private *p = priv; > 226 u16 val, newval, mask = (~NMI_NOW); 227 228 /* writing back 1b1 to NMI_NOW of TCO1_CNT register 229 * causes NMI_NOW bit inversion what consequently does 230 * not allow to perform the register's value comparison 231 * properly. 232 * 233 * NMI_NOW bit masking for TCO1_CNT register values 234 * helps to avoid possible NMI_NOW bit inversions on 235 * following write operation. 236 */ 237 val = inw(TCO1_CNT(p)) & mask; 238 if (set) 239 val |= BIT(0); 240 else 241 val &= ~BIT(0); 242 outw(val, TCO1_CNT(p)); 243 newval = inw(TCO1_CNT(p)) & mask; 244 245 /* make sure the update is successful */ 246 return val != newval ? -EIO : 0; 247 } 248 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
