Hi Dimitris, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 493ffd6605b2d3d4dc7008ab927dba319f36671f commit: 31ac3bcee47b8628d676bf4080c56b238d0222d1 net/fungible: Fix reference to __udivdi3 on 32b builds date: 6 months ago config: arm-randconfig-r013-20221010 compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=31ac3bcee47b8628d676bf4080c56b238d0222d1 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 31ac3bcee47b8628d676bf4080c56b238d0222d1 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot All warnings (new ones prefixed by >>): arch/arm/boot/compressed/atags_to_fdt.c:129:5: warning: no previous prototype for function 'atags_to_fdt' [-Wmissing-prototypes] int atags_to_fdt(void *atag_list, void *fdt, int total_space) ^ arch/arm/boot/compressed/atags_to_fdt.c:129:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int atags_to_fdt(void *atag_list, void *fdt, int total_space) ^ static >> arch/arm/boot/compressed/atags_to_fdt.c:129:5: warning: stack frame size (1352) exceeds limit (1280) in 'atags_to_fdt' [-Wframe-larger-than] int atags_to_fdt(void *atag_list, void *fdt, int total_space) ^ 2 warnings generated. vim +/atags_to_fdt +129 arch/arm/boot/compressed/atags_to_fdt.c 31d0b9f9982f8e Ben Dooks 2018-10-12 120 b90b9a38251e9c Nicolas Pitre 2011-09-13 121 /* b90b9a38251e9c Nicolas Pitre 2011-09-13 122 * Convert and fold provided ATAGs into the provided FDT. b90b9a38251e9c Nicolas Pitre 2011-09-13 123 * 4716e2e34a22a8 Geert Uytterhoeven 2021-05-19 124 * Return values: b90b9a38251e9c Nicolas Pitre 2011-09-13 125 * = 0 -> pretend success b90b9a38251e9c Nicolas Pitre 2011-09-13 126 * = 1 -> bad ATAG (may retry with another possible ATAG pointer) b90b9a38251e9c Nicolas Pitre 2011-09-13 127 * < 0 -> error from libfdt b90b9a38251e9c Nicolas Pitre 2011-09-13 128 */ b90b9a38251e9c Nicolas Pitre 2011-09-13 @129 int atags_to_fdt(void *atag_list, void *fdt, int total_space) :::::: The code at line 129 was first introduced by commit :::::: b90b9a38251e9c89c34179eccde57411ceb5f1aa ARM: zImage: allow supplementing appended DTB with traditional ATAG data :::::: TO: Nicolas Pitre :::::: CC: Nicolas Pitre -- 0-DAY CI Kernel Test Service https://01.org/lkp