tree: https://github.com/ammarfaizi2/linux-block palmer/linux/riscv-hwprobe-v1 head: ea6ba33fae4f9ca9d13f457ea2ccc8dd9f99d367 commit: 510c491cb9d87dcbdc91c63558dc704968723240 [4/5] RISC-V: hwprobe: Support probing of misaligned accesss performance config: riscv-randconfig-r003-20221012 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 riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/ammarfaizi2/linux-block/commit/510c491cb9d87dcbdc91c63558dc704968723240 git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block git fetch --no-tags ammarfaizi2-block palmer/linux/riscv-hwprobe-v1 git checkout 510c491cb9d87dcbdc91c63558dc704968723240 # 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=riscv SHELL=/bin/bash arch/riscv/kernel/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot All warnings (new ones prefixed by >>): In file included from arch/riscv/kernel/sys_riscv.c:8: In file included from include/linux/syscalls.h:88: In file included from include/trace/syscall.h:7: In file included from include/linux/trace_events.h:9: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __raw_readb(PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) ((__force __u16)(__le16)(x)) ^ In file included from arch/riscv/kernel/sys_riscv.c:8: In file included from include/linux/syscalls.h:88: In file included from include/trace/syscall.h:7: In file included from include/linux/trace_events.h:9: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr)); ~~~~~~~~~~ ^ include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) ^ In file included from arch/riscv/kernel/sys_riscv.c:8: In file included from include/linux/syscalls.h:88: In file included from include/trace/syscall.h:7: In file included from include/linux/trace_events.h:9: In file included from include/linux/hardirq.h:11: In file included from ./arch/riscv/include/generated/asm/hardirq.h:1: In file included from include/asm-generic/hardirq.h:17: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/riscv/include/asm/io.h:136: include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writeb(value, PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr); ~~~~~~~~~~ ^ include/asm-generic/io.h:1134:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port; ~~~~~~~~~~ ^ >> arch/riscv/kernel/sys_riscv.c:229:8: warning: variable 'ret' is used uninitialized whenever switch case is taken [-Wsometimes-uninitialized] case RISCV_HWPROBE_KEY_CPUPERF_0: ^~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/riscv/include/uapi/asm/hwprobe.h:27:37: note: expanded from macro 'RISCV_HWPROBE_KEY_CPUPERF_0' #define RISCV_HWPROBE_KEY_CPUPERF_0 5 ^ arch/riscv/kernel/sys_riscv.c:234:7: note: uninitialized use occurs here if (ret < 0) ^~~ arch/riscv/kernel/sys_riscv.c:197:11: note: initialize the variable 'ret' to silence this warning long ret; ^ = 0 8 warnings generated. vim +/ret +229 arch/riscv/kernel/sys_riscv.c 159 160 static 161 long do_riscv_hwprobe(struct riscv_hwprobe __user *pairs, long pair_count, 162 long key_offset, long cpu_count, 163 unsigned long __user *cpus_user, unsigned long flags) 164 { 165 size_t out, k; 166 long ret; 167 struct cpumask cpus; 168 169 /* Check the reserved flags. */ 170 if (flags != 0) 171 return -EINVAL; 172 173 /* 174 * The only supported values must be the same on all CPUs, but check to 175 * make sure userspace at least tried to provide something here for 176 * future compatibility. 177 */ 178 cpumask_clear(&cpus); 179 if (cpu_count > cpumask_size()) 180 cpu_count = cpumask_size(); 181 ret = copy_from_user(&cpus, cpus_user, cpu_count); 182 if (!ret) 183 return -EFAULT; 184 185 186 /* 187 * Userspace must provide at least one online CPU, without that there's 188 * no way to define what is supported. 189 */ 190 cpumask_and(&cpus, &cpus, cpu_online_mask); 191 if (cpumask_empty(&cpus)) 192 return -EINVAL; 193 194 out = 0; 195 k = key_offset; 196 while (out < pair_count && k < RISCV_HWPROBE_MAX_KEY) { 197 long ret; 198 199 switch (k) { 200 case RISCV_HWPROBE_KEY_MVENDORID: 201 case RISCV_HWPROBE_KEY_MARCHID: 202 case RISCV_HWPROBE_KEY_MIMPID: 203 ret = hwprobe_mid(pairs + out, k, &cpus); 204 break; 205 206 /* 207 * The kernel already assumes that the base single-letter ISA 208 * extensions are supported on all harts, and only supports the 209 * IMA base, so just cheat a bit here and tell that to 210 * userspace. 211 */ 212 case RISCV_HWPROBE_KEY_BASE_BEHAVIOR: 213 ret = set_hwprobe(pairs + out, k, 214 RISCV_HWPROBE_BASE_BEHAVIOR_IMA); 215 break; 216 217 case RISCV_HWPROBE_KEY_IMA_EXT_0: 218 { 219 u64 val = 0; 220 221 if (has_fpu()) 222 val |= RISCV_HWPROBE_IMA_FD; 223 if (elf_hwcap & RISCV_ISA_EXT_c) 224 val |= RISCV_HWPROBE_IMA_C; 225 ret = set_hwprobe(pairs + out, k, val); 226 } 227 break; 228 > 229 case RISCV_HWPROBE_KEY_CPUPERF_0: 230 set_hwprobe(pairs + out, k, hwprobe_misaligned(&cpus)); 231 break; 232 } 233 234 if (ret < 0) 235 return ret; 236 if (ret == 0) 237 out++; 238 } 239 240 return out; 241 -- 0-DAY CI Kernel Test Service https://01.org/lkp