linux-kernel - Re: [RESEND PATCH v27 11/15] leds: lp55xx: Add multicolor framework support to lp55xx

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Date:   Wed, 17 Jun 2020 14:22:13 -0500
From:   Dan Murphy <dmurphy@...com>
To:     kernel test robot <lkp@...el.com>, <jacek.anaszewski@...il.com>,
        <pavel@....cz>, <robh@...nel.org>
CC:     <kbuild-all@...ts.01.org>, <devicetree@...r.kernel.org>,
        <linux-leds@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH v27 11/15] leds: lp55xx: Add multicolor framework
 support to lp55xx

Pavel/Jacek

On 6/17/20 11:28 AM, kernel test robot wrote:
> Hi Dan,
>
> I love your patch! Yet something to improve:
>
> [auto build test ERROR on pavel-linux-leds/for-next]
> [cannot apply to j.anaszewski-leds/for-next]
> [if your patch is applied to the wrong git tree, please drop us a note to help
> improve the system. BTW, we also suggest to use '--base' option to specify the
> base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
>
> url:    https://github.com/0day-ci/linux/commits/Dan-Murphy/Multicolor-Framework-v27/20200616-042217
> base:   git://git.kernel.org/pub/scm/linux/kernel/git/pavel/linux-leds.git for-next
> config: ia64-randconfig-r015-20200617 (attached as .config)
> compiler: ia64-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
>          # save the attached .config to linux build tree
>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All errors (new ones prefixed by >>, old ones prefixed by <<):
>
> ia64-linux-ld: drivers/leds/leds-lp55xx-common.o: in function `lp55xx_set_mc_brightness':
>>> drivers/leds/leds-lp55xx-common.c:146: undefined reference to `led_mc_calc_color_components'
> ia64-linux-ld: drivers/leds/leds-lp55xx-common.o: in function `devm_led_classdev_multicolor_register':
>>> include/linux/led-class-multicolor.h:74: undefined reference to `devm_led_classdev_multicolor_register_ext'
> vim +146 drivers/leds/leds-lp55xx-common.c
>
>     138	
>     139	static int lp55xx_set_mc_brightness(struct led_classdev *cdev,
>     140					    enum led_brightness brightness)
>     141	{
>     142		struct led_classdev_mc *mc_dev = lcdev_to_mccdev(cdev);
>     143		struct lp55xx_led *led = mcled_cdev_to_led(mc_dev);
>     144		struct lp55xx_device_config *cfg = led->chip->cfg;
>     145	
>   > 146		led_mc_calc_color_components(&led->mc_cdev, brightness);
>     147		return cfg->multicolor_brightness_fn(led);
>     148	

Well this was a mess to figure out.

The only fix I can figure out here is to remove the

     depends on LEDS_CLASS_MULTI_COLOR || !LEDS_CLASS_MULTI_COLOR

from each child device and add

     select LEDS_CLASS_MULTI_COLOR

to the LP55XX_COMMON

This way the Multi color framework will inherit the symbol that was set 
by the COMMON flag which is inherited by majority from the child flags.

Dan