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* drivers/net/dsa/lan9303_mdio.c:145:34: warning: unused variable 'lan9303_mdio_of_match'
@ 2022-05-24  6:36 kernel test robot
  0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2022-05-24  6:36 UTC (permalink / raw)
  To: Alexander Lobakin
  Cc: llvm, kbuild-all, linux-kernel, Vladimir Oltean, Florian Fainelli

Hi Alexander,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   143a6252e1b8ab424b4b293512a97cca7295c182
commit: 227d72063fccb2d19b30fb4197fba478514f7d83 dsa: simplify Kconfig symbols and dependencies
date:   1 year, 2 months ago
config: s390-randconfig-r034-20220524 (https://download.01.org/0day-ci/archive/20220524/202205241446.TMjrujfW-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 10c9ecce9f6096e18222a331c5e7d085bd813f75)
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 config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/net/dsa/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   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/lan9303_mdio.c:10:
   In file included from include/linux/mdio.h:9:
   In file included from include/uapi/linux/mdio.h:15:
   In file included from include/linux/mii.h:13:
   In file included from include/linux/linkmode.h:5:
   In file included from include/linux/ethtool.h:18:
   In file included from include/uapi/linux/ethtool.h:19:
   In file included from include/linux/if_ether.h:19:
   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/lan9303_mdio.c:10:
   In file included from include/linux/mdio.h:9:
   In file included from include/uapi/linux/mdio.h:15:
   In file included from include/linux/mii.h:13:
   In file included from include/linux/linkmode.h:5:
   In file included from include/linux/ethtool.h:18:
   In file included from include/uapi/linux/ethtool.h:19:
   In file included from include/linux/if_ether.h:19:
   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/lan9303_mdio.c:10:
   In file included from include/linux/mdio.h:9:
   In file included from include/uapi/linux/mdio.h:15:
   In file included from include/linux/mii.h:13:
   In file included from include/linux/linkmode.h:5:
   In file included from include/linux/ethtool.h:18:
   In file included from include/uapi/linux/ethtool.h:19:
   In file included from include/linux/if_ether.h:19:
   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/lan9303_mdio.c:145:34: warning: unused variable 'lan9303_mdio_of_match' [-Wunused-const-variable]
   static const struct of_device_id lan9303_mdio_of_match[] = {
                                    ^
   21 warnings generated.


vim +/lan9303_mdio_of_match +145 drivers/net/dsa/lan9303_mdio.c

dc7005831523d6 Juergen Beisert 2017-04-18  144  
dc7005831523d6 Juergen Beisert 2017-04-18 @145  static const struct of_device_id lan9303_mdio_of_match[] = {
dc7005831523d6 Juergen Beisert 2017-04-18  146  	{ .compatible = "smsc,lan9303-mdio" },
dc7005831523d6 Juergen Beisert 2017-04-18  147  	{ /* sentinel */ },
dc7005831523d6 Juergen Beisert 2017-04-18  148  };
dc7005831523d6 Juergen Beisert 2017-04-18  149  MODULE_DEVICE_TABLE(of, lan9303_mdio_of_match);
dc7005831523d6 Juergen Beisert 2017-04-18  150  

:::::: The code at line 145 was first introduced by commit
:::::: dc7005831523d674be11a98f3256e0cc871157d6 net: dsa: LAN9303: add MDIO managed mode support

:::::: TO: Juergen Beisert <jbe@pengutronix.de>
:::::: CC: David S. Miller <davem@davemloft.net>

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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2022-05-24  6:36 drivers/net/dsa/lan9303_mdio.c:145:34: warning: unused variable 'lan9303_mdio_of_match' kernel test robot

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