Hi Sid, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.10.y head: f9063e43ccbb353c5b2cafe59c6b9534aa7ddc14 commit: 243f325ecc902c9936d1edb838454f4a4dd75034 [3/1438] Hexagon: fix build errors config: hexagon-buildonly-randconfig-r004-20210804 (attached as .config) compiler: clang version 12.0.0 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 # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=243f325ecc902c9936d1edb838454f4a4dd75034 git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-5.10.y git checkout 243f325ecc902c9936d1edb838454f4a4dd75034 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=hexagon If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> drivers/bluetooth/hci_ll.c:768:34: warning: unused variable 'hci_ti_of_match' [-Wunused-const-variable] static const struct of_device_id hci_ti_of_match[] = { ^ 1 warning generated. -- >> net/bluetooth/hci_core.c:2109:26: warning: result of comparison of constant 65536 with expression of type '__u16' (aka 'unsigned short') is always false [-Wtautological-constant-out-of-range-compare] if (!dev_num || dev_num > (PAGE_SIZE * 2) / sizeof(*dr)) ~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1 warning generated. Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for SND_SOC_MAX98357A Depends on SOUND && !UML && SND && SND_SOC && GPIOLIB Selected by - SND_SOC_STORM && SOUND && !UML && SND && SND_SOC && SND_SOC_QCOM vim +/hci_ti_of_match +768 drivers/bluetooth/hci_ll.c 371805522f8709 Rob Herring 2017-04-13 767 371805522f8709 Rob Herring 2017-04-13 @768 static const struct of_device_id hci_ti_of_match[] = { 4166493c97c0c7 David Lechner 2017-12-12 769 { .compatible = "ti,cc2560" }, c127a871357b8d Sebastian Reichel 2017-06-08 770 { .compatible = "ti,wl1271-st" }, c127a871357b8d Sebastian Reichel 2017-06-08 771 { .compatible = "ti,wl1273-st" }, c127a871357b8d Sebastian Reichel 2017-06-08 772 { .compatible = "ti,wl1281-st" }, c127a871357b8d Sebastian Reichel 2017-06-08 773 { .compatible = "ti,wl1283-st" }, c127a871357b8d Sebastian Reichel 2017-06-08 774 { .compatible = "ti,wl1285-st" }, c127a871357b8d Sebastian Reichel 2017-06-08 775 { .compatible = "ti,wl1801-st" }, c127a871357b8d Sebastian Reichel 2017-06-08 776 { .compatible = "ti,wl1805-st" }, c127a871357b8d Sebastian Reichel 2017-06-08 777 { .compatible = "ti,wl1807-st" }, 371805522f8709 Rob Herring 2017-04-13 778 { .compatible = "ti,wl1831-st" }, 371805522f8709 Rob Herring 2017-04-13 779 { .compatible = "ti,wl1835-st" }, 371805522f8709 Rob Herring 2017-04-13 780 { .compatible = "ti,wl1837-st" }, 371805522f8709 Rob Herring 2017-04-13 781 {}, 371805522f8709 Rob Herring 2017-04-13 782 }; 371805522f8709 Rob Herring 2017-04-13 783 MODULE_DEVICE_TABLE(of, hci_ti_of_match); 371805522f8709 Rob Herring 2017-04-13 784 :::::: The code at line 768 was first introduced by commit :::::: 371805522f870986144fcd88727a47858e364a2c bluetooth: hci_uart: add LL protocol serdev driver support :::::: TO: Rob Herring :::::: CC: Marcel Holtmann --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org