Re: [PATCH] block: Removed a warning while compiling with a cross compiler for parisc

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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

Attachment: .config.gz
Description: application/gzip


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