Re: [PATCH v8 4/6] RISC-V: Detect unaligned vector accesses supported

Hi Jesse,

kernel test robot noticed the following build errors:

[auto build test ERROR on 32d5f7add080a936e28ab4142bfeea6b06999789]

url:    https://github.com/intel-lab-lkp/linux/commits/Jesse-Taube/RISC-V-Check-scalar-unaligned-access-on-all-CPUs/20240820-052900
base:   32d5f7add080a936e28ab4142bfeea6b06999789
patch link:    https://lore.kernel.org/r/20240819212605.1837175-5-jesse%40rivosinc.com
patch subject: [PATCH v8 4/6] RISC-V: Detect unaligned vector accesses supported
config: riscv-defconfig (https://download.01.org/0day-ci/archive/20240820/202408201720.u8SfprDk-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 26670e7fa4f032a019d23d56c6a02926e854e8af)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240820/202408201720.u8SfprDk-lkp@intel.com/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 [off-list ref]
| Closes: https://lore.kernel.org/oe-kbuild-all/202408201720.u8SfprDk-lkp@intel.com/ (local)

All errors (new ones prefixed by >>):

   In file included from arch/riscv/kernel/sys_hwprobe.c:7:
   In file included from include/linux/syscalls.h:93:
   In file included from include/trace/syscall.h:7:
   In file included from include/linux/trace_events.h:6:
   In file included from include/linux/ring_buffer.h:5:
   In file included from include/linux/mm.h:2228:
   include/linux/vmstat.h:514:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     514 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~

quoted

arch/riscv/kernel/sys_hwprobe.c:263:7: error: use of undeclared identifier 'RISCV_HWPROBE_KEY_VECTOR_MISALIGNED_PERF'

     263 |         case RISCV_HWPROBE_KEY_VECTOR_MISALIGNED_PERF:
         |              ^
   1 warning and 1 error generated.


vim +/RISCV_HWPROBE_KEY_VECTOR_MISALIGNED_PERF +263 arch/riscv/kernel/sys_hwprobe.c

   234	
   235	static void hwprobe_one_pair(struct riscv_hwprobe *pair,
   236				     const struct cpumask *cpus)
   237	{
   238		switch (pair->key) {
   239		case RISCV_HWPROBE_KEY_MVENDORID:
   240		case RISCV_HWPROBE_KEY_MARCHID:
   241		case RISCV_HWPROBE_KEY_MIMPID:
   242			hwprobe_arch_id(pair, cpus);
   243			break;
   244		/*
   245		 * The kernel already assumes that the base single-letter ISA
   246		 * extensions are supported on all harts, and only supports the
   247		 * IMA base, so just cheat a bit here and tell that to
   248		 * userspace.
   249		 */
   250		case RISCV_HWPROBE_KEY_BASE_BEHAVIOR:
   251			pair->value = RISCV_HWPROBE_BASE_BEHAVIOR_IMA;
   252			break;
   253	
   254		case RISCV_HWPROBE_KEY_IMA_EXT_0:
   255			hwprobe_isa_ext0(pair, cpus);
   256			break;
   257	
   258		case RISCV_HWPROBE_KEY_CPUPERF_0:
   259		case RISCV_HWPROBE_KEY_MISALIGNED_SCALAR_PERF:
   260			pair->value = hwprobe_misaligned(cpus);
   261			break;
   262	
 > 263		case RISCV_HWPROBE_KEY_VECTOR_MISALIGNED_PERF:
   264			pair->value = hwprobe_vec_misaligned(cpus);
   265			break;
   266	
   267		case RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE:
   268			pair->value = 0;
   269			if (hwprobe_ext0_has(cpus, RISCV_HWPROBE_EXT_ZICBOZ))
   270				pair->value = riscv_cboz_block_size;
   271			break;
   272		case RISCV_HWPROBE_KEY_HIGHEST_VIRT_ADDRESS:
   273			pair->value = user_max_virt_addr();
   274			break;
   275	
   276		case RISCV_HWPROBE_KEY_TIME_CSR_FREQ:
   277			pair->value = riscv_timebase;
   278			break;
   279	
   280		/*
   281		 * For forward compatibility, unknown keys don't fail the whole
   282		 * call, but get their element key set to -1 and value set to 0
   283		 * indicating they're unrecognized.
   284		 */
   285		default:
   286			pair->key = -1;
   287			pair->value = 0;
   288			break;
   289		}
   290	}
   291	

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