Hi Thierry, [auto build test ERROR on pwm/for-next] [also build test ERROR on v4.10-rc2 next-20170104] [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/Thierry-Reding/pwm-Remove-pwm_can_sleep/20170104-222234 base: https://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm.git for-next config: x86_64-randconfig-i0-201701 (attached as .config) compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All errors (new ones prefixed by >>): drivers/leds/leds-pwm.c: In function 'led_pwm_add': >> drivers/leds/leds-pwm.c:115:2: error: implicit declaration of function 'pwm_can_sleep' [-Werror=implicit-function-declaration] led_data->can_sleep = pwm_can_sleep(led_data->pwm); ^ cc1: some warnings being treated as errors vim +/pwm_can_sleep +115 drivers/leds/leds-pwm.c 5f7b03dc Russell King 2014-04-06 109 ret = PTR_ERR(led_data->pwm); 5f7b03dc Russell King 2014-04-06 110 dev_err(dev, "unable to request PWM for %s: %d\n", 5f7b03dc Russell King 2014-04-06 111 led->name, ret); 5f7b03dc Russell King 2014-04-06 112 return ret; 5f7b03dc Russell King 2014-04-06 113 } 5f7b03dc Russell King 2014-04-06 114 5f7b03dc Russell King 2014-04-06 @115 led_data->can_sleep = pwm_can_sleep(led_data->pwm); 9aa07625 Jacek Anaszewski 2015-08-20 116 if (!led_data->can_sleep) 9aa07625 Jacek Anaszewski 2015-08-20 117 led_data->cdev.brightness_set = led_pwm_set; 9aa07625 Jacek Anaszewski 2015-08-20 118 else :::::: The code at line 115 was first introduced by commit :::::: 5f7b03dc2ab5f4ca16e5d6bc3e6dcd2953c6fede leds: leds-pwm: provide a common function to setup a single led-pwm device :::::: TO: Russell King :::::: CC: Bryan Wu --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation