tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-5.5 head: 718168b10350f5a0ad7dd1ca8bb6f76aa30fcd25 commit: 55f9c35937b7f1ab1747a346c5ae83e4c751ac5d [1/8] gpiolib: Add support for the irqdomain which doesn't use irq_fwspec as arg config: nios2-10m50_defconfig (attached as .config) compiler: nios2-linux-gcc (GCC) 9.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 55f9c35937b7f1ab1747a346c5ae83e4c751ac5d # save the attached .config to linux build tree GCC_VERSION=9.2.0 make.cross ARCH=nios2 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from include/asm-generic/gpio.h:13, from include/linux/gpio.h:62, from drivers/net/phy/mdio_bus.c:20: include/linux/gpio/driver.h: In function 'gpiochip_populate_parent_fwspec_twocell': 552 | } | ^ include/linux/gpio/driver.h: In function 'gpiochip_populate_parent_fwspec_fourcell': include/linux/gpio/driver.h:558:1: warning: no return statement in function returning non-void [-Wreturn-type] 558 | } | ^ vim +552 include/linux/gpio/driver.h fdd61a013a24f2 Linus Walleij 2019-08-08 547 55f9c35937b7f1 Kevin Hao 2020-01-14 548 static inline void *gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *chip, fdd61a013a24f2 Linus Walleij 2019-08-08 549 unsigned int parent_hwirq, fdd61a013a24f2 Linus Walleij 2019-08-08 550 unsigned int parent_type) fdd61a013a24f2 Linus Walleij 2019-08-08 551 { fdd61a013a24f2 Linus Walleij 2019-08-08 @552 } fdd61a013a24f2 Linus Walleij 2019-08-08 553 :::::: The code at line 552 was first introduced by commit :::::: fdd61a013a24f2699aec1a446f0168682b6f9ec4 gpio: Add support for hierarchical IRQ domains :::::: TO: Linus Walleij <linus.walleij(a)linaro.org&gt; :::::: CC: Linus Walleij <linus.walleij(a)linaro.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org