11:55 p.m.
Hi Masahiro,
I love your patch! Perhaps something to improve:
[auto build test WARNING on powerpc/next]
[also build test WARNING on linus/master v5.12-rc2 next-20210309]
[cannot apply to kbuild/for-next asm-generic/master]
[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/Masahiro-Yamada/kbuild-build-spe...
base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: s390-randconfig-r012-20210308 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project
820f508b08d7c94b2dd7847e9710d2bc36d3dd45)
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/16dfb9e33ee3b9d411560c44c016edc6a...
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review
Masahiro-Yamada/kbuild-build-speed-improvement-of-CONFIG_TRIM_UNUSED_KSYMS/20210309-232117
git checkout 16dfb9e33ee3b9d411560c44c016edc6a3e27e47
# 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(a)intel.com>
All warnings (new ones prefixed by >>):
In file included from drivers/spi/spi-mux.c:10:
In file included from include/linux/spi/spi.h:15:
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: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:105:32: note: expanded from macro '__swab16'
(__builtin_constant_p((__u16)(x)) ? \
^
In file included from drivers/spi/spi-mux.c:10:
In file included from include/linux/spi/spi.h:15:
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: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:106:21: note: expanded from macro '__swab16'
___constant_swab16(x) : \
^
include/uapi/linux/swab.h:15:12: note: expanded from macro
'___constant_swab16'
(((__u16)(x) & (__u16)0x00ffU) << 8) | \
^
In file included from drivers/spi/spi-mux.c:10:
In file included from include/linux/spi/spi.h:15:
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: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:106:21: note: expanded from macro '__swab16'
___constant_swab16(x) : \
^
include/uapi/linux/swab.h:16:12: note: expanded from macro
'___constant_swab16'
(((__u16)(x) & (__u16)0xff00U) >> 8)))
^
In file included from drivers/spi/spi-mux.c:10:
In file included from include/linux/spi/spi.h:15:
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: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:107:12: note: expanded from macro '__swab16'
__fswab16(x))
^
In file included from drivers/spi/spi-mux.c:10:
In file included from include/linux/spi/spi.h:15:
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:118:32: note: expanded from macro '__swab32'
(__builtin_constant_p((__u32)(x)) ? \
^
In file included from drivers/spi/spi-mux.c:10:
In file included from include/linux/spi/spi.h:15:
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:19:12: note: expanded from macro
'___constant_swab32'
(((__u32)(x) & (__u32)0x000000ffUL) << 24) | \
^
In file included from drivers/spi/spi-mux.c:10:
In file included from include/linux/spi/spi.h:15:
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 drivers/spi/spi-mux.c:10:
In file included from include/linux/spi/spi.h:15:
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 drivers/spi/spi-mux.c:10:
In file included from include/linux/spi/spi.h:15:
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 drivers/spi/spi-mux.c:10:
In file included from include/linux/spi/spi.h:15:
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 drivers/spi/spi-mux.c:10:
In file included from include/linux/spi/spi.h:15:
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);
~~~~~~~~~~ ^
20 warnings generated.
--
In file included from drivers/spi/spi-sc18is602.c:11:
In file included from include/linux/spi/spi.h:15:
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: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:105:32: note: expanded from macro '__swab16'
(__builtin_constant_p((__u16)(x)) ? \
^
In file included from drivers/spi/spi-sc18is602.c:11:
In file included from include/linux/spi/spi.h:15:
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: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:106:21: note: expanded from macro '__swab16'
___constant_swab16(x) : \
^
include/uapi/linux/swab.h:15:12: note: expanded from macro
'___constant_swab16'
(((__u16)(x) & (__u16)0x00ffU) << 8) | \
^
In file included from drivers/spi/spi-sc18is602.c:11:
In file included from include/linux/spi/spi.h:15:
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: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:106:21: note: expanded from macro '__swab16'
___constant_swab16(x) : \
^
include/uapi/linux/swab.h:16:12: note: expanded from macro
'___constant_swab16'
(((__u16)(x) & (__u16)0xff00U) >> 8)))
^
In file included from drivers/spi/spi-sc18is602.c:11:
In file included from include/linux/spi/spi.h:15:
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: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:107:12: note: expanded from macro '__swab16'
__fswab16(x))
^
In file included from drivers/spi/spi-sc18is602.c:11:
In file included from include/linux/spi/spi.h:15:
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:118:32: note: expanded from macro '__swab32'
(__builtin_constant_p((__u32)(x)) ? \
^
In file included from drivers/spi/spi-sc18is602.c:11:
In file included from include/linux/spi/spi.h:15:
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:19:12: note: expanded from macro
'___constant_swab32'
(((__u32)(x) & (__u32)0x000000ffUL) << 24) | \
^
In file included from drivers/spi/spi-sc18is602.c:11:
In file included from include/linux/spi/spi.h:15:
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 drivers/spi/spi-sc18is602.c:11:
In file included from include/linux/spi/spi.h:15:
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 drivers/spi/spi-sc18is602.c:11:
In file included from include/linux/spi/spi.h:15:
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 drivers/spi/spi-sc18is602.c:11:
In file included from include/linux/spi/spi.h:15:
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 drivers/spi/spi-sc18is602.c:11:
In file included from include/linux/spi/spi.h:15:
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);
~~~~~~~~~~ ^
drivers/spi/spi-sc18is602.c:265:12: warning: cast to smaller integer type 'enum
chips' from 'const void *' [-Wvoid-pointer-to-enum-cast]
hw->id = (enum chips)of_device_get_match_data(&client->dev);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
21 warnings generated.
..
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