tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 9d3e48f20e1159a7bb2ff5de96594b6375157fe0 commit: bfd2defed94d3be843b0c2d3d6b13571c24b4c33 [7654/8449] dma-mapping: add benchmark support for streaming DMA APIs config: s390-randconfig-r013-20201126 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 175ebad958a0ebaf6c56c20ab30b9d4347742c29) 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 s390 cross compiling tool for clang build # apt-get install binutils-s390x-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=bfd2defed94d3be843b0c2d3d6b13571c24b4c33 git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout bfd2defed94d3be843b0c2d3d6b13571c24b4c33 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32' ___constant_swab32(x) : \ ^ include/uapi/linux/swab.h:19:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ ^ In file included from kernel/dma/map_benchmark.c:11: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:490:61: 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/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32' ___constant_swab32(x) : \ ^ include/uapi/linux/swab.h:20:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ ^ In file included from kernel/dma/map_benchmark.c:11: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:490:61: 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/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32' ___constant_swab32(x) : \ ^ include/uapi/linux/swab.h:21:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ ^ In file included from kernel/dma/map_benchmark.c:11: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:490:61: 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/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:119:21: note: expanded from macro '__swab32' ___constant_swab32(x) : \ ^ include/uapi/linux/swab.h:22:12: note: expanded from macro '___constant_swab32' (((__u32)(x) & (__u32)0xff000000UL) >> 24))) ^ In file included from kernel/dma/map_benchmark.c:11: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:490:61: 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/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x)) ^ include/uapi/linux/swab.h:120:12: note: expanded from macro '__swab32' __fswab32(x)) ^ In file included from kernel/dma/map_benchmark.c:11: In file included from include/linux/dma-mapping.h:10: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:80: include/asm-generic/io.h:501:33: 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:511:59: 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:521:59: 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:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] readsl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesb(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesw(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] writesl(PCI_IOBASE + addr, buffer, count); ~~~~~~~~~~ ^ >> kernel/dma/map_benchmark.c:195:37: warning: variable 'argp' is uninitialized when used within its own initialization [-Wuninitialized] void __user *argp = (void __user *)argp; ~~~~ ^~~~ 21 warnings generated. vim +/argp +195 kernel/dma/map_benchmark.c 190 191 static long map_benchmark_ioctl(struct file *file, unsigned int cmd, 192 unsigned long arg) 193 { 194 struct map_benchmark_data *map = file->private_data; > 195 void __user *argp = (void __user *)argp; 196 u64 old_dma_mask; 197 198 int ret; 199 200 if (copy_from_user(&map->bparam, argp, sizeof(map->bparam))) 201 return -EFAULT; 202 203 switch (cmd) { 204 case DMA_MAP_BENCHMARK: 205 if (map->bparam.threads == 0 || 206 map->bparam.threads > DMA_MAP_MAX_THREADS) { 207 pr_err("invalid thread number\n"); 208 return -EINVAL; 209 } 210 211 if (map->bparam.seconds == 0 || 212 map->bparam.seconds > DMA_MAP_MAX_SECONDS) { 213 pr_err("invalid duration seconds\n"); 214 return -EINVAL; 215 } 216 217 if (map->bparam.node != NUMA_NO_NODE && 218 !node_possible(map->bparam.node)) { 219 pr_err("invalid numa node\n"); 220 return -EINVAL; 221 } 222 223 switch (map->bparam.dma_dir) { 224 case DMA_MAP_BIDIRECTIONAL: 225 map->dir = DMA_BIDIRECTIONAL; 226 break; 227 case DMA_MAP_FROM_DEVICE: 228 map->dir = DMA_FROM_DEVICE; 229 break; 230 case DMA_MAP_TO_DEVICE: 231 map->dir = DMA_TO_DEVICE; 232 break; 233 default: 234 pr_err("invalid DMA direction\n"); 235 return -EINVAL; 236 } 237 238 old_dma_mask = dma_get_mask(map->dev); 239 240 ret = dma_set_mask(map->dev, 241 DMA_BIT_MASK(map->bparam.dma_bits)); 242 if (ret) { 243 pr_err("failed to set dma_mask on device %s\n", 244 dev_name(map->dev)); 245 return -EINVAL; 246 } 247 248 ret = do_map_benchmark(map); 249 250 /* 251 * restore the original dma_mask as many devices' dma_mask are 252 * set by architectures, acpi, busses. When we bind them back 253 * to their original drivers, those drivers shouldn't see 254 * dma_mask changed by benchmark 255 */ 256 dma_set_mask(map->dev, old_dma_mask); 257 break; 258 default: 259 return -EINVAL; 260 } 261 262 if (copy_to_user(argp, &map->bparam, sizeof(map->bparam))) 263 return -EFAULT; 264 265 return ret; 266 } 267 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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