Hi Milan, kernel test robot noticed the following build errors:
[auto build test ERROR on kees/for-next/hardening] [also build test ERROR on next-20260519] [cannot apply to linus/master v6.16-rc1] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Milan-Tripkovic/riscv-lib-add-memcmp-implementation/20260519-221028 base: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/hardening patch link: https://lore.kernel.org/r/20260519140029.1190381-3-milant2002%40gmail.com patch subject: [PATCH v5 2/2] lib/string_kunit: extend benchmarks and unit test to memcmp() config: riscv-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20260520/[email protected]/config) compiler: riscv64-linux-gnu-gcc (Debian 14.2.0-19) 14.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260520/[email protected]/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ All errors (new ones prefixed by >>): arch/riscv/lib/memcmp.S: Assembler messages: >> arch/riscv/lib/memcmp.S:58: Error: unrecognized opcode `rev8 t1,t1', >> extension `zbb' or `zbkb' required >> arch/riscv/lib/memcmp.S:59: Error: unrecognized opcode `rev8 t2,t2', >> extension `zbb' or `zbkb' required arch/riscv/lib/memcmp.S:85: Error: unrecognized opcode `rev8 t1,t1', extension `zbb' or `zbkb' required arch/riscv/lib/memcmp.S:86: Error: unrecognized opcode `rev8 t2,t2', extension `zbb' or `zbkb' required vim +58 arch/riscv/lib/memcmp.S 12 13 /* int memcmp(const void *cs, const void *ct, size_t n) */ 14 SYM_FUNC_START(memcmp) 15 /* 16 * Parameters 17 * a0 - Pointer to first memory block (cs), also return value 18 * a1 - Pointer to second memory block (ct) 19 * a2 - Number of bytes to compare (n), decremented during loop 20 * 21 * Returns 22 * a0 - 0 if equal, positive if cs > ct, negative if cs < ct 23 * 24 * Clobbers 25 * t0, t1, t2, t3, t4 26 */ 27 add t3, a0, a2 28 or t0, a0, a1 29 andi t0, t0, (SZREG - 1) 30 bnez t0, 5f 31 32 addi t4, t3, -SZREG 33 bltu t4, a0, 7f 34 35 1: 36 REG_L t1, 0(a0) 37 REG_L t2, 0(a1) 38 bne t1, t2, 2f 39 addi a0, a0, SZREG 40 addi a1, a1, SZREG 41 bleu a0, t4, 1b 42 43 #if defined(CONFIG_TOOLCHAIN_HAS_ZBB) 44 7: 45 __ALTERNATIVE_CFG("j 5f", "nop", 0, RISCV_ISA_EXT_ZBB, 46 IS_ENABLED(CONFIG_RISCV_ISA_ZBB)) 47 48 beq a0, t3, 4f 49 REG_L t1, 0(a0) 50 REG_L t2, 0(a1) 51 52 sub t0, t3, a0 53 li t4, SZREG 54 sub t0, t4, t0 55 slli t0, t0, 3 56 57 #ifndef CONFIG_CPU_BIG_ENDIAN > 58 rev8 t1, t1 > 59 rev8 t2, t2 60 #endif 61 srl t1, t1, t0 62 srl t2, t2, t0 63 64 bne t1, t2, 8f 65 li a0, 0 66 ret 67 #else 68 j 5f 69 #endif 70 5: 71 beq a0, t3, 4f 72 6: 73 lbu t1, 0(a0) 74 lbu t2, 0(a1) 75 bne t1, t2, 3f 76 addi a0, a0, 1 77 addi a1, a1, 1 78 bne a0, t3, 6b 79 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
