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Subjectdrivers/net/dsa/ocelot/seville_vsc9953.c:1255:34: warning: unused variable 'seville_of_match'
Hi Alexander,

First bad commit (maybe != root cause):

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: af4cf6a5689a9ecc21722cb2bb6220dcaee89c6e
commit: 227d72063fccb2d19b30fb4197fba478514f7d83 dsa: simplify Kconfig symbols and dependencies
date: 4 months ago
config: s390-randconfig-r035-20210711 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d69635ed9ecf36fd0ca85906bfde17949671cbe)
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/torvalds/linux.git/commit/?id=227d72063fccb2d19b30fb4197fba478514f7d83
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 227d72063fccb2d19b30fb4197fba478514f7d83
# 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 drivers/net/dsa/ocelot/seville_vsc9953.c:6:
In file included from include/soc/mscc/ocelot_vcap.h:9:
In file included from include/soc/mscc/ocelot.h:10:
In file included from include/linux/if_vlan.h:10:
In file included from include/linux/netdevice.h:37:
In file included from include/net/net_namespace.h:39:
In file included from include/linux/skbuff.h:31:
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 drivers/net/dsa/ocelot/seville_vsc9953.c:6:
In file included from include/soc/mscc/ocelot_vcap.h:9:
In file included from include/soc/mscc/ocelot.h:10:
In file included from include/linux/if_vlan.h:10:
In file included from include/linux/netdevice.h:37:
In file included from include/net/net_namespace.h:39:
In file included from include/linux/skbuff.h:31:
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 drivers/net/dsa/ocelot/seville_vsc9953.c:6:
In file included from include/soc/mscc/ocelot_vcap.h:9:
In file included from include/soc/mscc/ocelot.h:10:
In file included from include/linux/if_vlan.h:10:
In file included from include/linux/netdevice.h:37:
In file included from include/net/net_namespace.h:39:
In file included from include/linux/skbuff.h:31:
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 drivers/net/dsa/ocelot/seville_vsc9953.c:6:
In file included from include/soc/mscc/ocelot_vcap.h:9:
In file included from include/soc/mscc/ocelot.h:10:
In file included from include/linux/if_vlan.h:10:
In file included from include/linux/netdevice.h:37:
In file included from include/net/net_namespace.h:39:
In file included from include/linux/skbuff.h:31:
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);
~~~~~~~~~~ ^
>> drivers/net/dsa/ocelot/seville_vsc9953.c:1255:34: warning: unused variable 'seville_of_match' [-Wunused-const-variable]
static const struct of_device_id seville_of_match[] = {
^
21 warnings generated.


vim +/seville_of_match +1255 drivers/net/dsa/ocelot/seville_vsc9953.c

84705fc165526e Maxim Kochetkov 2020-07-13 1254
84705fc165526e Maxim Kochetkov 2020-07-13 @1255 static const struct of_device_id seville_of_match[] = {
84705fc165526e Maxim Kochetkov 2020-07-13 1256 { .compatible = "mscc,vsc9953-switch" },
84705fc165526e Maxim Kochetkov 2020-07-13 1257 { },
84705fc165526e Maxim Kochetkov 2020-07-13 1258 };
84705fc165526e Maxim Kochetkov 2020-07-13 1259 MODULE_DEVICE_TABLE(of, seville_of_match);
84705fc165526e Maxim Kochetkov 2020-07-13 1260

:::::: The code at line 1255 was first introduced by commit
:::::: 84705fc165526e8e55d208b2b10a48cc720a106a net: dsa: felix: introduce support for Seville VSC9953 switch

:::::: TO: Maxim Kochetkov <fido_max@inbox.ru>
:::::: CC: David S. Miller <davem@davemloft.net>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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