Hi Sid, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: d5ad8ec3cfb56a017de6a784835666475b4be349 commit: 788dcee0306e1bdbae1a76d1b3478bb899c5838e Hexagon: fix build errors date: 3 months ago config: hexagon-buildonly-randconfig-r006-20210805 (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/torvalds/linux.git/commit/?id=788dcee0306e1bdbae1a76d1b3478bb899c5838e git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 788dcee0306e1bdbae1a76d1b3478bb899c5838e # 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/mtd/nand/raw/omap2.c:2302:34: warning: unused variable 'omap_nand_ids' [-Wunused-const-variable] static const struct of_device_id omap_nand_ids[] = { ^ 1 warning generated. -- >> sound/soc/codecs/adau1977-spi.c:58:34: warning: unused variable 'adau1977_spi_of_match' [-Wunused-const-variable] static const struct of_device_id adau1977_spi_of_match[] = { ^ 1 warning generated. vim +/omap_nand_ids +2302 drivers/mtd/nand/raw/omap2.c 67ce04bf2746f8 drivers/mtd/nand/omap2.c Vimal Singh 2009-05-12 2301 c9711ec5250b22 drivers/mtd/nand/omap2.c Roger Quadros 2014-05-21 @2302 static const struct of_device_id omap_nand_ids[] = { c9711ec5250b22 drivers/mtd/nand/omap2.c Roger Quadros 2014-05-21 2303 { .compatible = "ti,omap2-nand", }, c9711ec5250b22 drivers/mtd/nand/omap2.c Roger Quadros 2014-05-21 2304 {}, c9711ec5250b22 drivers/mtd/nand/omap2.c Roger Quadros 2014-05-21 2305 }; b156b7f2169bb4 drivers/mtd/nand/omap2.c Javier Martinez Canillas 2016-10-17 2306 MODULE_DEVICE_TABLE(of, omap_nand_ids); c9711ec5250b22 drivers/mtd/nand/omap2.c Roger Quadros 2014-05-21 2307 :::::: The code at line 2302 was first introduced by commit :::::: c9711ec5250b22fd94e9b34c17c095e001a90e66 mtd: nand: omap: Clean up device tree support :::::: TO: Roger Quadros :::::: CC: Roger Quadros --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org