tree: https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git gpio-charger-mentioned head: f9e5824140b913437cc820c3f8bb33353ee4961d commit: f6d984418ffde19322fd149105200224ac2bc089 [54/55] gpiolib: split character device into gpiolib-cdev config: parisc-randconfig-r005-20200611 (attached as .config) compiler: hppa-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout f6d984418ffde19322fd149105200224ac2bc089 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=parisc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): In file included from arch/parisc/include/asm/io.h:6, from include/linux/io.h:13, from include/linux/irq.h:20, from arch/parisc/include/asm/hardirq.h:13, from include/linux/hardirq.h:9, from include/linux/interrupt.h:11, from drivers/gpio/gpiolib-cdev.c:6: include/asm-generic/pgtable.h: In function 'pte_clear_not_present_full': arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable] 96 | pte_t old_pte; | ^~~~~~~ arch/parisc/include/asm/pgtable.h:322:34: note: in expansion of macro 'set_pte_at' 322 | #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0)) | ^~~~~~~~~~ include/asm-generic/pgtable.h:202:2: note: in expansion of macro 'pte_clear' 202 | pte_clear(mm, address, ptep); | ^~~~~~~~~ include/asm-generic/pgtable.h: In function '__ptep_modify_prot_commit': arch/parisc/include/asm/pgtable.h:96:9: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable] 96 | pte_t old_pte; | ^~~~~~~ include/asm-generic/pgtable.h:641:2: note: in expansion of macro 'set_pte_at' 641 | set_pte_at(vma->vm_mm, addr, ptep, pte); | ^~~~~~~~~~ drivers/gpio/gpiolib-cdev.c: At top level: 1127 | int gpiolib_cdev_register(struct gpio_device *gdev, dev_t devt) | ^~~~~~~~~~~~~~~~~~~~~ 1145 | void gpiolib_cdev_unregister(struct gpio_device *gdev) | ^~~~~~~~~~~~~~~~~~~~~~~ vim +/gpiolib_cdev_register +1127 drivers/gpio/gpiolib-cdev.c 1126 1128 { 1129 int ret; 1130 1131 cdev_init(&gdev->chrdev, &gpio_fileops); 1132 gdev->chrdev.owner = THIS_MODULE; 1133 gdev->dev.devt = MKDEV(MAJOR(devt), gdev->id); 1134 1135 ret = cdev_device_add(&gdev->chrdev, &gdev->dev); 1136 if (ret) 1137 return ret; 1138 1139 chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n", 1140 MAJOR(devt), gdev->id); 1141 1142 return 0; 1143 } 1144 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org