tree: https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next head: de3a46504a58426f1c91117be601ae270180bc93 commit: 3ee265f75ce831f66bce6c7facdb0499264cc5bb [28/31] hwmon: (npcm750-pwm-fan) replace spin_lock_irqsave by spin_lock in hard IRQ config: nios2-randconfig-s031-20210209 (attached as .config) compiler: nios2-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-215-g0fb77bb6-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git/... git remote add hwmon https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git git fetch --no-tags hwmon hwmon-next git checkout 3ee265f75ce831f66bce6c7facdb0499264cc5bb # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=nios2 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): drivers/hwmon/npcm750-pwm-fan.c: In function 'npcm7xx_fan_isr': 494 | spin_unlock_irqrestore(&data->fan_lock[module], flags); | ^~~~~ | flag drivers/hwmon/npcm750-pwm-fan.c:494:51: note: each undeclared identifier is reported only once for each function it appears in Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for SERIAL_CORE_CONSOLE Depends on TTY && HAS_IOMEM Selected by - EARLY_PRINTK vim +494 drivers/hwmon/npcm750-pwm-fan.c f1fd4a4db77703 Tomer Maimon 2018-07-04 480 f1fd4a4db77703 Tomer Maimon 2018-07-04 481 static irqreturn_t npcm7xx_fan_isr(int irq, void *dev_id) f1fd4a4db77703 Tomer Maimon 2018-07-04 482 { f1fd4a4db77703 Tomer Maimon 2018-07-04 483 struct npcm7xx_pwm_fan_data *data = dev_id; f1fd4a4db77703 Tomer Maimon 2018-07-04 484 int module; f1fd4a4db77703 Tomer Maimon 2018-07-04 485 u8 flag; f1fd4a4db77703 Tomer Maimon 2018-07-04 486 f1fd4a4db77703 Tomer Maimon 2018-07-04 487 module = irq - data->fan_irq[0]; 3ee265f75ce831 Tian Tao 2021-02-07 488 spin_lock(&data->fan_lock[module]); f1fd4a4db77703 Tomer Maimon 2018-07-04 489 f1fd4a4db77703 Tomer Maimon 2018-07-04 490 flag = ioread8(NPCM7XX_FAN_REG_TICTRL(data->fan_base, module)); f1fd4a4db77703 Tomer Maimon 2018-07-04 491 if (flag > 0) { f1fd4a4db77703 Tomer Maimon 2018-07-04 492 npcm7xx_check_cmp(data, module, NPCM7XX_FAN_CMPA, flag); f1fd4a4db77703 Tomer Maimon 2018-07-04 493 npcm7xx_check_cmp(data, module, NPCM7XX_FAN_CMPB, flag); f1fd4a4db77703 Tomer Maimon 2018-07-04 @494 spin_unlock_irqrestore(&data->fan_lock[module], flags); f1fd4a4db77703 Tomer Maimon 2018-07-04 495 return IRQ_HANDLED; f1fd4a4db77703 Tomer Maimon 2018-07-04 496 } f1fd4a4db77703 Tomer Maimon 2018-07-04 497 3ee265f75ce831 Tian Tao 2021-02-07 498 spin_unlock(&data->fan_lock[module]); f1fd4a4db77703 Tomer Maimon 2018-07-04 499 f1fd4a4db77703 Tomer Maimon 2018-07-04 500 return IRQ_NONE; f1fd4a4db77703 Tomer Maimon 2018-07-04 501 } f1fd4a4db77703 Tomer Maimon 2018-07-04 502 :::::: The code at line 494 was first introduced by commit :::::: f1fd4a4db777030a2542701fb0d3a261d4472d6d hwmon: Add NPCM7xx PWM and Fan driver :::::: TO: Tomer Maimon <tmaimon77(a)gmail.com&gt; :::::: CC: Guenter Roeck <linux(a)roeck-us.net&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org