linux-kernel - Re: [PATCH v6 2/2] leds: Add control of the voltage/current regulator to the LED core

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Date:   Sat, 5 Oct 2019 10:32:29 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Jean-Jacques Hiblot <jjhiblot@...com>
Cc:     kbuild-all@...org, jacek.anaszewski@...il.com, pavel@....cz,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
        dmurphy@...com, tomi.valkeinen@...com,
        Jean-Jacques Hiblot <jjhiblot@...com>
Subject: Re: [PATCH v6 2/2] leds: Add control of the voltage/current
 regulator to the LED core

Hi Jean-Jacques,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on j.anaszewski-leds/for-next]
[cannot apply to v5.4-rc1 next-20191004]
[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/Jean-Jacques-Hiblot/leds-Add-control-of-the-voltage-current-regulator-to-the-LED-core/20191005-062631
base:   https://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds.git for-next
config: sparc-allyesconfig (attached as .config)
compiler: sparc64-linux-gcc (GCC) 7.4.0
reproduce:
        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
        GCC_VERSION=7.4.0 make.cross ARCH=sparc 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   drivers/leds/led-core.c: In function 'try_turn_on_regulator_if_needed':
>> drivers/leds/led-core.c:65:15: warning: overflow in implicit constant conversion [-Woverflow]
       atomic_and(~REG_R_ON, &led_cdev->regulator_state);
                  ^
   drivers/leds/led-core.c: In function 'led_set_brightness_nopm':
   drivers/leds/led-core.c:353:27: warning: overflow in implicit constant conversion [-Woverflow]
       old = atomic_fetch_and(~REG_U_ON,
                              ^

vim +65 drivers/leds/led-core.c

    54	
    55	static void try_turn_on_regulator_if_needed(struct led_classdev *led_cdev)
    56	{
    57		int old = atomic_cmpxchg(&led_cdev->regulator_state, REG_R_OFF_U_ON,
    58				      REG_R_ON_U_ON);
    59		if (old == REG_R_OFF_U_ON) {
    60			int rc = regulator_enable(led_cdev->regulator);
    61	
    62			if (rc) {
    63				dev_err(led_cdev->dev,
    64					"Failed to enable the regulator (%d)\n", rc);
  > 65				atomic_and(~REG_R_ON, &led_cdev->regulator_state);
    66			}
    67		}
    68	}
    69	

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