Hi "Michael, Thank you for the patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v5.16 next-20220121] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Michael-T-Kloos/Fixed-Misaligned... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2c271fe77d52a0555161926c232cd5bc07178b39 config: riscv-randconfig-r021-20220120 (https://download.01.org/0day-ci/archive/20220123/202201230123.GN7Kvrlq-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 7b3d30728816403d1fd73cc5082e9fb761262bce) 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 riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/0day-ci/linux/commit/c1930afcc76babc4e2313f67d0fe103a2... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Michael-T-Kloos/Fixed-Misaligned-memory-access-Fixed-pointer-comparison/20220121-074148 git checkout c1930afcc76babc4e2313f67d0fe103a26f07712 # 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=riscv SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): 1: jalr zero, (t0) ^ vim +113 arch/riscv/lib/memmove.S 8 9 SYM_FUNC_START(__memmove) 10 SYM_FUNC_START_ALIAS(memmove) 11 /* 12 * Returns 13 * a0 - dest 14 * 15 * Parameters 16 * a0 - Inclusive first byte of dest 17 * a1 - Inclusive first byte of src 18 * a2 - Length of copy 19 * 20 * Because the return matches the parameter register a0, 21 * we will not clobber or modify that register. 22 */ 23 24 /* Return if nothing to do */ 25 beq a0, a1, exit_memmove 26 beqz a2, exit_memmove 27 28 /* 29 * Register Uses 30 * a3 - Inclusive first multibyte of src 31 * a4 - Non-inclusive last multibyte of src 32 * a5 - Non-inclusive last byte of src 33 * 34 * During the copy 35 * Forward Copy: a1 - Index counter of src 36 * Reverse Copy: a5 - Index counter of src 37 * Both Copy Modes: t2 - Index counter of dest 38 * Both Copy Modes: t1 - Temporary for load-store 39 * Both Copy Modes: t0 - Link 40 */ 41 42 /* 43 * Solve for last byte now. We will solve the rest when 44 * they are needed for the copy because either byte copy 45 * does not require any of the others (Wasted effort if 46 * byte copy gets used) or we do not yet have enough 47 * information to solve them. 48 */ 49 add a5, a1, a2 50 51 /* 52 * Byte copy if copying less than SZREG bytes. 53 * This can cause problems with the bulk copy 54 * implementation below and is small enough not 55 * to bother. 56 */ 57 andi t0, a2, -SZREG 58 beqz t0, byte_copy 59 60 /* Determine the maximum granularity of co-alignment. */ 61 xor t0, a0, a1 62 #if SZREG >= 8 63 andi t1, t0, 0x7 64 beqz t1, doubleword_copy 65 #endif 66 andi t1, t0, 0x3 67 beqz t1, word_copy 68 andi t1, t0, 0x1 69 beqz t1, halfword_copy 70 /* Fall through to byte copy if nothing larger is found. */ 71 72 byte_copy: 73 bltu a1, a0, byte_copy_reverse 74 75 byte_copy_forward: 76 add t2, a0, zero 77 byte_copy_fw_callin: 78 beq a1, a5, exit_memmove 79 lb t1, (a1) 80 sb t1, (t2) 81 addi a1, a1, 1 82 addi t2, t2, 1 83 j byte_copy_fw_callin 84 85 byte_copy_reverse: 86 add t2, a0, a2 87 byte_copy_rv_callin: 88 beq a1, a5, exit_memmove 89 addi a5, a5, -1 90 addi t2, t2, -1 91 lb t1, (a5) 92 sb t1, (t2) 93 j byte_copy_rv_callin 94 95 exit_memmove: 96 ret 97 98 copy_bytes_until_aligned_fw: 99 beq a1, a3, 1f /* Reuse the return from the other copy loop */ 100 lb t1, (a1) 101 sb t1, (t2) 102 addi a1, a1, 1 103 addi t2, t2, 1 104 j copy_bytes_until_aligned_fw 105 106 copy_bytes_until_aligned_rv: 107 beq a4, a5, 1f 108 addi a5, a5, -1 109 addi t2, t2, -1 110 lb t1, (a5) 111 sb t1, (t2) 112 j copy_bytes_until_aligned_rv 114 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org