Hi Abd-Alrhman, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on block/for-next] [also build test WARNING on v5.13 next-20210630] [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/Abd-Alrhman-Masalkhi/block-Removed-a-warning-while-compiling-with-a-cross-compiler-for-parisc/20210630-161407 base: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next config: s390-randconfig-r014-20210630 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d21d5472501460933e78aead04cf59579025ba4) 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://github.com/0day-ci/linux/commit/749f487a31d6818dadc37ba729475d0486daf81c git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Abd-Alrhman-Masalkhi/block-Removed-a-warning-while-compiling-with-a-cross-compiler-for-parisc/20210630-161407 git checkout 749f487a31d6818dadc37ba729475d0486daf81c # 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 >>): In file included from block/genhd.c:14: In file included from include/linux/blkdev.h:25: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:75: include/asm-generic/io.h:464:31: 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:477:61: 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/big_endian.h:36:59: note: expanded from macro '__le16_to_cpu' #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x)) ^ include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16' #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x)) ^ In file included from block/genhd.c:14: In file included from include/linux/blkdev.h:25: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:75: 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:115:54: note: expanded from macro '__swab32' #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x)) ^ In file included from block/genhd.c:14: In file included from include/linux/blkdev.h:25: In file included from include/linux/scatterlist.h:9: In file included from arch/s390/include/asm/io.h:75: 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); ~~~~~~~~~~ ^ >> block/genhd.c:1110:6: warning: no previous prototype for function 'print_disk_stats' [-Wmissing-prototypes] void print_disk_stats(struct seq_file *seqf, ^ block/genhd.c:1110:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void print_disk_stats(struct seq_file *seqf, ^ static 13 warnings generated. vim +/print_disk_stats +1110 block/genhd.c 1109 > 1110 void print_disk_stats(struct seq_file *seqf, 1111 unsigned int inflight, struct disk_stats *stat) 1112 { 1113 seq_printf(seqf, "%lu %lu %lu %u " 1114 "%lu %lu %lu %u " 1115 "%u %u %u " 1116 "%lu %lu %lu %u " 1117 "%lu %u" 1118 "\n", 1119 stat->ios[STAT_READ], 1120 stat->merges[STAT_READ], 1121 stat->sectors[STAT_READ], 1122 (unsigned int)div_u64(stat->nsecs[STAT_READ], 1123 NSEC_PER_MSEC), 1124 stat->ios[STAT_WRITE], 1125 stat->merges[STAT_WRITE], 1126 stat->sectors[STAT_WRITE], 1127 (unsigned int)div_u64(stat->nsecs[STAT_WRITE], 1128 NSEC_PER_MSEC), 1129 inflight, 1130 jiffies_to_msecs(stat->io_ticks), 1131 (unsigned int)div_u64(stat->nsecs[STAT_READ] + 1132 stat->nsecs[STAT_WRITE] + 1133 stat->nsecs[STAT_DISCARD] + 1134 stat->nsecs[STAT_FLUSH], 1135 NSEC_PER_MSEC), 1136 stat->ios[STAT_DISCARD], 1137 stat->merges[STAT_DISCARD], 1138 stat->sectors[STAT_DISCARD], 1139 (unsigned int)div_u64(stat->nsecs[STAT_DISCARD], 1140 NSEC_PER_MSEC), 1141 stat->ios[STAT_FLUSH], 1142 (unsigned int)div_u64(stat->nsecs[STAT_FLUSH], 1143 NSEC_PER_MSEC) 1144 ); 1145 } 1146 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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