tree: https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git gpiochip-no-driver-h head: 76089802fe1b5db2ac8ad21da3b065f2513000eb commit: 76089802fe1b5db2ac8ad21da3b065f2513000eb [4/4] unremove config: mips-randconfig-r012-20200709 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 02946de3802d3bc65bc9f2eb9b8d4969b5a7add8) 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 git checkout 76089802fe1b5db2ac8ad21da3b065f2513000eb # 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 >>): err); ^~~ include/net/cfg80211.h:7837:35: note: expanded from macro 'wiphy_err' dev_err(&(wiphy)->dev, format, ##args) ^~~~ include/linux/dev_printk.h:104:32: note: expanded from macro 'dev_err' _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__) ^~~~~~~~~~~ drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.c:53:12: note: initialize the variable 'err' to silence this warning int i, err; ^ = 0 1 warning generated. vim +/err +91 drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.c cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 50 cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 51 int brcms_led_register(struct brcms_info *wl) cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 52 { cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 53 int i, err; cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 54 struct brcms_led *radio_led = &wl->radio_led; cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 55 /* get CC core */ cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 56 struct bcma_drv_cc *cc_drv = &wl->wlc->hw->d11core->bus->drv_cc; cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 57 struct gpio_chip *bcma_gpio = &cc_drv->gpio; cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 58 struct ssb_sprom *sprom = &wl->wlc->hw->d11core->bus->sprom; cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 59 u8 *leds[] = { &sprom->gpio0, cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 60 &sprom->gpio1, cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 61 &sprom->gpio2, cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 62 &sprom->gpio3 }; bac167c2b9d351 drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.c Linus Walleij 2020-07-06 63 int hwnum = -1; bac167c2b9d351 drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.c Linus Walleij 2020-07-06 64 enum gpio_lookup_flags lflags = GPIO_ACTIVE_HIGH; cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 65 cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 66 if (!bcma_gpio || !gpio_is_valid(bcma_gpio->base)) cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 67 return -ENODEV; cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 68 cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 69 /* find radio enabled LED */ cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 70 for (i = 0; i < BRCMS_LED_NO; i++) { cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 71 u8 led = *leds[i]; cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 72 if ((led & BRCMS_LED_BEH_MASK) == BRCMS_LED_RADIO) { bac167c2b9d351 drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.c Linus Walleij 2020-07-06 73 hwnum = i; cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 74 if (led & BRCMS_LED_AL_MASK) bac167c2b9d351 drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.c Linus Walleij 2020-07-06 75 lflags = GPIO_ACTIVE_LOW; cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 76 break; cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 77 } cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 78 } cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 79 bac167c2b9d351 drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.c Linus Walleij 2020-07-06 80 /* No LED, bail out */ bac167c2b9d351 drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.c Linus Walleij 2020-07-06 81 if (hwnum == -1) cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 82 return -ENODEV; cd864522b349cf drivers/net/wireless/brcm80211/brcmsmac/led.c Piotr Haber 2013-03-03 83 bac167c2b9d351 drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.c Linus Walleij 2020-07-06 84 /* Try to obtain this LED GPIO line */ bac167c2b9d351 drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.c Linus Walleij 2020-07-06 85 radio_led->gpiod = gpiochip_request_own_desc(bcma_gpio, hwnum, bac167c2b9d351 drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.c Linus Walleij 2020-07-06 86 "radio on", lflags, bac167c2b9d351 drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.c Linus Walleij 2020-07-06 87 GPIOD_OUT_LOW); bac167c2b9d351 drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.c Linus Walleij 2020-07-06 88 bac167c2b9d351 drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.c Linus Walleij 2020-07-06 89 if (IS_ERR(radio_led->gpiod)) { bac167c2b9d351 drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.c Linus Walleij 2020-07-06 90 wiphy_err(wl->wiphy, "requesting led GPIO failed (err: %d)\n", bac167c2b9d351 drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.c Linus Walleij 2020-07-06 @91 err); :::::: The code at line 91 was first introduced by commit :::::: bac167c2b9d351703c4f769f9feabfae89bac789 brcm80211: brcmsmac: Move LEDs to GPIO descriptors :::::: TO: Linus Walleij <linus.walleij(a)linaro.org&gt; :::::: CC: Linus Walleij <linus.walleij(a)linaro.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org