Hi Justin, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 169387e2aa291a4e3cb856053730fe99d6cec06f commit: e56e18985596617ae426ed5997fb2e737cffb58b lib/crypto: add prompts back to crypto libraries date: 11 days ago config: arm-randconfig-r004-20220128 (https://download.01.org/0day-ci/archive/20220129/202201291408.Pkylyt75-lkp@intel.com/config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 33b45ee44b1f32ffdbc995e6fec806271b4b3ba4) 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=e56e18985596617ae426ed5997fb2e737cffb58b git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout e56e18985596617ae426ed5997fb2e737cffb58b # save the config file to linux build tree mkdir build_dir 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 as appropriate Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> arch/arm/lib/xor-neon.c:30:2: warning: This code requires at least version 4.6 of GCC [-W#warnings] #warning This code requires at least version 4.6 of GCC ^ 1 warning generated. Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for TEGRA20_APB_DMA Depends on DMADEVICES && (ARCH_TEGRA || COMPILE_TEST Selected by - SOC_TEGRA_FUSE && ARCH_TEGRA && ARCH_TEGRA_2x_SOC vim +30 arch/arm/lib/xor-neon.c 01956597cbc46d Ard Biesheuvel 2013-05-17 16 01956597cbc46d Ard Biesheuvel 2013-05-17 17 /* 01956597cbc46d Ard Biesheuvel 2013-05-17 18 * Pull in the reference implementations while instructing GCC (through 01956597cbc46d Ard Biesheuvel 2013-05-17 19 * -ftree-vectorize) to attempt to exploit implicit parallelism and emit 01956597cbc46d Ard Biesheuvel 2013-05-17 20 * NEON instructions. 01956597cbc46d Ard Biesheuvel 2013-05-17 21 */ 01956597cbc46d Ard Biesheuvel 2013-05-17 22 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6) 01956597cbc46d Ard Biesheuvel 2013-05-17 23 #pragma GCC optimize "tree-vectorize" 01956597cbc46d Ard Biesheuvel 2013-05-17 24 #else 01956597cbc46d Ard Biesheuvel 2013-05-17 25 /* 01956597cbc46d Ard Biesheuvel 2013-05-17 26 * While older versions of GCC do not generate incorrect code, they fail to 01956597cbc46d Ard Biesheuvel 2013-05-17 27 * recognize the parallel nature of these functions, and emit plain ARM code, 01956597cbc46d Ard Biesheuvel 2013-05-17 28 * which is known to be slower than the optimized ARM code in asm-arm/xor.h. 01956597cbc46d Ard Biesheuvel 2013-05-17 29 */ 01956597cbc46d Ard Biesheuvel 2013-05-17 @30 #warning This code requires at least version 4.6 of GCC 01956597cbc46d Ard Biesheuvel 2013-05-17 31 #endif 01956597cbc46d Ard Biesheuvel 2013-05-17 32 :::::: The code at line 30 was first introduced by commit :::::: 01956597cbc46df072f20f90a40eebe356200c38 ARM: crypto: add NEON accelerated XOR implementation :::::: TO: Ard Biesheuvel :::::: CC: Ard Biesheuvel --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org