Hi, [auto build test ERROR on robh/for-next] [also build test ERROR on v4.7-rc5 next-20160624] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Keerthy/mfd-regulator-tps65218-Clean-ups/20160627-191539 base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next config: i386-randconfig-a0-201626 (attached as .config) compiler: gcc-6 (Debian 6.1.1-1) 6.1.1 20160430 reproduce: # save the attached .config to linux build tree make ARCH=i386 All errors (new ones prefixed by >>): drivers/gpio/gpio-tps65218.c: In function 'tps65218_gpio_get': >> drivers/gpio/gpio-tps65218.c:33:8: error: implicit declaration of function 'tps65218_reg_read' [-Werror=implicit-function-declaration] ret = tps65218_reg_read(tps65218, TPS65218_REG_ENABLE2, &val); ^~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/tps65218_reg_read +33 drivers/gpio/gpio-tps65218.c c366c76a Nicolas Saenz Julienne 2016-01-30 27 { c366c76a Nicolas Saenz Julienne 2016-01-30 28 struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc); c366c76a Nicolas Saenz Julienne 2016-01-30 29 struct tps65218 *tps65218 = tps65218_gpio->tps65218; c366c76a Nicolas Saenz Julienne 2016-01-30 30 unsigned int val; c366c76a Nicolas Saenz Julienne 2016-01-30 31 int ret; c366c76a Nicolas Saenz Julienne 2016-01-30 32 c366c76a Nicolas Saenz Julienne 2016-01-30 @33 ret = tps65218_reg_read(tps65218, TPS65218_REG_ENABLE2, &val); c366c76a Nicolas Saenz Julienne 2016-01-30 34 if (ret) c366c76a Nicolas Saenz Julienne 2016-01-30 35 return ret; c366c76a Nicolas Saenz Julienne 2016-01-30 36 :::::: The code at line 33 was first introduced by commit :::::: c366c76a2c41d0c545e51b53056b21515db32e77 gpio: add tps65218 gpio :::::: TO: Nicolas Saenz Julienne :::::: CC: Linus Walleij --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation