[lee-leds:for-leds-next-next 2/2] drivers/leds/led-class-multicolor.c:51:24: error: call to '__compiletime_assert_210' declared with 'error' attribute: min(intensity_value[i], led_cdev->max_brightness) signedness error

[kernel test robot <lkp@intel.com>]

:::::: 
:::::: Manual check reason: "__compiletime_assert_NNN"
:::::: 

BCC: lkp@intel.com
CC: llvm@lists.linux.dev
CC: oe-kbuild-all@lists.linux.dev
CC: linux-leds@vger.kernel.org
TO: Michael Tretter <m.tretter@pengutronix.de>
CC: Lee Jones <lee@kernel.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/lee/leds.git for-leds-next-next
head:   787130d7bc49ec01604277a3480f42ba1557385e
commit: 787130d7bc49ec01604277a3480f42ba1557385e [2/2] leds: multicolor: Limit intensity to max_brightness of LED
:::::: branch date: 21 hours ago
:::::: commit date: 21 hours ago
config: x86_64-buildonly-randconfig-003-20260306 (https://download.01.org/0day-ci/archive/20260306/202603061843.snQjuQDA-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260306/202603061843.snQjuQDA-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/r/202603061843.snQjuQDA-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/leds/led-class-multicolor.c:51:24: error: call to '__compiletime_assert_210' declared with 'error' attribute: min(intensity_value[i], led_cdev->max_brightness) signedness error
      51 |                 intensity_value[i] = min(intensity_value[i],
         |                                      ^
   include/linux/minmax.h:105:19: note: expanded from macro 'min'
     105 | #define min(x, y)       __careful_cmp(min, x, y)
         |                         ^
   include/linux/minmax.h:98:2: note: expanded from macro '__careful_cmp'
      98 |         __careful_cmp_once(op, x, y, __UNIQUE_ID(x_), __UNIQUE_ID(y_))
         |         ^
   include/linux/minmax.h:93:2: note: expanded from macro '__careful_cmp_once'
      93 |         BUILD_BUG_ON_MSG(!__types_ok(ux, uy),           \
         |         ^
   note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
   include/linux/compiler_types.h:694:2: note: expanded from macro '_compiletime_assert'
     694 |         __compiletime_assert(condition, msg, prefix, suffix)
         |         ^
   include/linux/compiler_types.h:687:4: note: expanded from macro '__compiletime_assert'
     687 |                         prefix ## suffix();                             \
         |                         ^
   <scratch space>:185:1: note: expanded from here
     185 | __compiletime_assert_210
         | ^
   1 error generated.


vim +51 drivers/leds/led-class-multicolor.c

55d5d3b46b08a4 Dan Murphy      2020-07-16  29  
55d5d3b46b08a4 Dan Murphy      2020-07-16  30  static ssize_t multi_intensity_store(struct device *dev,
55d5d3b46b08a4 Dan Murphy      2020-07-16  31  				struct device_attribute *intensity_attr,
55d5d3b46b08a4 Dan Murphy      2020-07-16  32  				const char *buf, size_t size)
55d5d3b46b08a4 Dan Murphy      2020-07-16  33  {
55d5d3b46b08a4 Dan Murphy      2020-07-16  34  	struct led_classdev *led_cdev = dev_get_drvdata(dev);
55d5d3b46b08a4 Dan Murphy      2020-07-16  35  	struct led_classdev_mc *mcled_cdev = lcdev_to_mccdev(led_cdev);
55d5d3b46b08a4 Dan Murphy      2020-07-16  36  	int nrchars, offset = 0;
55d5d3b46b08a4 Dan Murphy      2020-07-16  37  	int intensity_value[LED_COLOR_ID_MAX];
55d5d3b46b08a4 Dan Murphy      2020-07-16  38  	int i;
55d5d3b46b08a4 Dan Murphy      2020-07-16  39  	ssize_t ret;
55d5d3b46b08a4 Dan Murphy      2020-07-16  40  
55d5d3b46b08a4 Dan Murphy      2020-07-16  41  	mutex_lock(&led_cdev->led_access);
55d5d3b46b08a4 Dan Murphy      2020-07-16  42  
55d5d3b46b08a4 Dan Murphy      2020-07-16  43  	for (i = 0; i < mcled_cdev->num_colors; i++) {
55d5d3b46b08a4 Dan Murphy      2020-07-16  44  		ret = sscanf(buf + offset, "%i%n",
55d5d3b46b08a4 Dan Murphy      2020-07-16  45  			     &intensity_value[i], &nrchars);
55d5d3b46b08a4 Dan Murphy      2020-07-16  46  		if (ret != 1) {
55d5d3b46b08a4 Dan Murphy      2020-07-16  47  			ret = -EINVAL;
55d5d3b46b08a4 Dan Murphy      2020-07-16  48  			goto err_out;
55d5d3b46b08a4 Dan Murphy      2020-07-16  49  		}
55d5d3b46b08a4 Dan Murphy      2020-07-16  50  		offset += nrchars;
787130d7bc49ec Michael Tretter 2026-01-23 @51  		intensity_value[i] = min(intensity_value[i],
787130d7bc49ec Michael Tretter 2026-01-23  52  					 led_cdev->max_brightness);
55d5d3b46b08a4 Dan Murphy      2020-07-16  53  	}
55d5d3b46b08a4 Dan Murphy      2020-07-16  54  
55d5d3b46b08a4 Dan Murphy      2020-07-16  55  	offset++;
55d5d3b46b08a4 Dan Murphy      2020-07-16  56  	if (offset < size) {
55d5d3b46b08a4 Dan Murphy      2020-07-16  57  		ret = -EINVAL;
55d5d3b46b08a4 Dan Murphy      2020-07-16  58  		goto err_out;
55d5d3b46b08a4 Dan Murphy      2020-07-16  59  	}
55d5d3b46b08a4 Dan Murphy      2020-07-16  60  
55d5d3b46b08a4 Dan Murphy      2020-07-16  61  	for (i = 0; i < mcled_cdev->num_colors; i++)
55d5d3b46b08a4 Dan Murphy      2020-07-16  62  		mcled_cdev->subled_info[i].intensity = intensity_value[i];
55d5d3b46b08a4 Dan Murphy      2020-07-16  63  
e35ca991a777ef Sven Schwermer  2025-04-04  64  	if (!test_bit(LED_BLINK_SW, &led_cdev->work_flags))
55d5d3b46b08a4 Dan Murphy      2020-07-16  65  		led_set_brightness(led_cdev, led_cdev->brightness);
55d5d3b46b08a4 Dan Murphy      2020-07-16  66  	ret = size;
55d5d3b46b08a4 Dan Murphy      2020-07-16  67  err_out:
55d5d3b46b08a4 Dan Murphy      2020-07-16  68  	mutex_unlock(&led_cdev->led_access);
55d5d3b46b08a4 Dan Murphy      2020-07-16  69  	return ret;
55d5d3b46b08a4 Dan Murphy      2020-07-16  70  }
55d5d3b46b08a4 Dan Murphy      2020-07-16  71  

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