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SubjectRe: [PATCH] block: Removed a warning while compiling with a cross compiler for parisc
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@intel.com>

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@lists.01.org
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