Hi Jaroslav, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 6145d80cfc62e3ed8f16ff584d6287e6d88b82b9 commit: e65bf99718b538c2f34e9444dfe1087789b58f94 [7722/11059] ALSA: HDA - remove the custom implementation for the audio LED trigger config: mips-randconfig-r016-20210409 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project dd453a1389b6a7e6d9214b449d3c54981b1a89b6) 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 # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout e65bf99718b538c2f34e9444dfe1087789b58f94 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): static int snd_ctl_led_get(struct snd_ctl_led *lctl) ^ 1 warning generated. vim +/snd_ctl_led_get +58 sound/core/control_led.c 22d8de62f11b28 Jaroslav Kysela 2021-03-17 57 22d8de62f11b28 Jaroslav Kysela 2021-03-17 @58 static int snd_ctl_led_get(struct snd_ctl_led *lctl) 22d8de62f11b28 Jaroslav Kysela 2021-03-17 59 { 22d8de62f11b28 Jaroslav Kysela 2021-03-17 60 struct snd_kcontrol *kctl = lctl->kctl; 22d8de62f11b28 Jaroslav Kysela 2021-03-17 61 struct snd_ctl_elem_info info; 22d8de62f11b28 Jaroslav Kysela 2021-03-17 62 struct snd_ctl_elem_value value; 22d8de62f11b28 Jaroslav Kysela 2021-03-17 63 unsigned int i; 22d8de62f11b28 Jaroslav Kysela 2021-03-17 64 int result; 22d8de62f11b28 Jaroslav Kysela 2021-03-17 65 22d8de62f11b28 Jaroslav Kysela 2021-03-17 66 memset(&info, 0, sizeof(info)); 22d8de62f11b28 Jaroslav Kysela 2021-03-17 67 info.id = kctl->id; 22d8de62f11b28 Jaroslav Kysela 2021-03-17 68 info.id.index += lctl->index_offset; 22d8de62f11b28 Jaroslav Kysela 2021-03-17 69 info.id.numid += lctl->index_offset; 22d8de62f11b28 Jaroslav Kysela 2021-03-17 70 result = kctl->info(kctl, &info); 22d8de62f11b28 Jaroslav Kysela 2021-03-17 71 if (result < 0) 22d8de62f11b28 Jaroslav Kysela 2021-03-17 72 return -1; 22d8de62f11b28 Jaroslav Kysela 2021-03-17 73 memset(&value, 0, sizeof(value)); 22d8de62f11b28 Jaroslav Kysela 2021-03-17 74 value.id = info.id; 22d8de62f11b28 Jaroslav Kysela 2021-03-17 75 result = kctl->get(kctl, &value); 22d8de62f11b28 Jaroslav Kysela 2021-03-17 76 if (result < 0) 22d8de62f11b28 Jaroslav Kysela 2021-03-17 77 return -1; 22d8de62f11b28 Jaroslav Kysela 2021-03-17 78 if (info.type == SNDRV_CTL_ELEM_TYPE_BOOLEAN || 22d8de62f11b28 Jaroslav Kysela 2021-03-17 79 info.type == SNDRV_CTL_ELEM_TYPE_INTEGER) { 22d8de62f11b28 Jaroslav Kysela 2021-03-17 80 for (i = 0; i < info.count; i++) 22d8de62f11b28 Jaroslav Kysela 2021-03-17 81 if (value.value.integer.value[i] != info.value.integer.min) 22d8de62f11b28 Jaroslav Kysela 2021-03-17 82 return 1; 22d8de62f11b28 Jaroslav Kysela 2021-03-17 83 } else if (info.type == SNDRV_CTL_ELEM_TYPE_INTEGER64) { 22d8de62f11b28 Jaroslav Kysela 2021-03-17 84 for (i = 0; i < info.count; i++) 22d8de62f11b28 Jaroslav Kysela 2021-03-17 85 if (value.value.integer64.value[i] != info.value.integer64.min) 22d8de62f11b28 Jaroslav Kysela 2021-03-17 86 return 1; 22d8de62f11b28 Jaroslav Kysela 2021-03-17 87 } 22d8de62f11b28 Jaroslav Kysela 2021-03-17 88 return 0; 22d8de62f11b28 Jaroslav Kysela 2021-03-17 89 } 22d8de62f11b28 Jaroslav Kysela 2021-03-17 90 :::::: The code at line 58 was first introduced by commit :::::: 22d8de62f11b287b279f1d4473a78c7d5e53e7bc ALSA: control - add generic LED trigger module as the new control layer :::::: TO: Jaroslav Kysela <perex(a)perex.cz&gt; :::::: CC: Takashi Iwai <tiwai(a)suse.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org