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From: kernel test robot <lkp@intel.com>
To: Haijun Liu <haijun.liu@mediatek.com>
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
	linux-kernel@vger.kernel.org,
	"Chandrashekar Devegowda" <chandrashekar.devegowda@intel.com>,
	"Ricardo Martinez" <ricardo.martinez@linux.intel.com>,
	"Loic Poulain" <loic.poulain@linaro.org>,
	"Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>,
	"Sergey Ryazanov" <ryazanov.s.a@gmail.com>
Subject: include/asm-generic/io.h:464:31: error: performing pointer arithmetic on a null pointer has undefined behavior
Date: Mon, 30 Jan 2023 13:23:59 +0800	[thread overview]
Message-ID: <202301301307.sAxDJudh-lkp@intel.com> (raw)

Hi Haijun,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   6d796c50f84ca79f1722bb131799e5a5710c4700
commit: 13e920d93e37fcaef4a9309515798a3cae9dcf19 net: wwan: t7xx: Add core components
date:   9 months ago
config: s390-randconfig-r025-20230129 (https://download.01.org/0day-ci/archive/20230130/202301301307.sAxDJudh-lkp@intel.com/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 4196ca3278f78c6e19246e54ab0ecb364e37d66a)
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=13e920d93e37fcaef4a9309515798a3cae9dcf19
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 13e920d93e37fcaef4a9309515798a3cae9dcf19
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash drivers/net/wwan/t7xx/

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

All errors (new ones prefixed by >>):

   In file included from drivers/net/wwan/t7xx/t7xx_pci.c:22:
   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:75:
>> include/asm-generic/io.h:464:31: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:477:61: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:37:59: 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 drivers/net/wwan/t7xx/t7xx_pci.c:22:
   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:75:
   include/asm-generic/io.h:490:61: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:35:59: 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 drivers/net/wwan/t7xx/t7xx_pci.c:22:
   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:75:
   include/asm-generic/io.h:501:33: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:511:59: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:521:59: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:609:20: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
           readsb(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:617:20: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
           readsw(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:625:20: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
           readsl(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:634:21: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
           writesb(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:643:21: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
           writesw(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:652:21: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
           writesl(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   12 errors generated.


vim +464 include/asm-generic/io.h

3f7e212df82ca0 Arnd Bergmann  2009-05-13  450  
9216efafc52ff9 Thierry Reding 2014-10-01  451  /*
9216efafc52ff9 Thierry Reding 2014-10-01  452   * {in,out}{b,w,l}() access little endian I/O. {in,out}{b,w,l}_p() can be
9216efafc52ff9 Thierry Reding 2014-10-01  453   * implemented on hardware that needs an additional delay for I/O accesses to
9216efafc52ff9 Thierry Reding 2014-10-01  454   * take effect.
9216efafc52ff9 Thierry Reding 2014-10-01  455   */
9216efafc52ff9 Thierry Reding 2014-10-01  456  
f009c89df79abe John Garry     2020-03-28  457  #if !defined(inb) && !defined(_inb)
f009c89df79abe John Garry     2020-03-28  458  #define _inb _inb
214ba3584b2e2c Stafford Horne 2020-07-26  459  static inline u8 _inb(unsigned long addr)
9216efafc52ff9 Thierry Reding 2014-10-01  460  {
87fe2d543f8173 Sinan Kaya     2018-04-05  461  	u8 val;
87fe2d543f8173 Sinan Kaya     2018-04-05  462  
87fe2d543f8173 Sinan Kaya     2018-04-05  463  	__io_pbr();
87fe2d543f8173 Sinan Kaya     2018-04-05 @464  	val = __raw_readb(PCI_IOBASE + addr);
abbbbc83a210e9 Will Deacon    2019-02-22  465  	__io_par(val);
87fe2d543f8173 Sinan Kaya     2018-04-05  466  	return val;
9216efafc52ff9 Thierry Reding 2014-10-01  467  }
9216efafc52ff9 Thierry Reding 2014-10-01  468  #endif
9216efafc52ff9 Thierry Reding 2014-10-01  469  

:::::: The code at line 464 was first introduced by commit
:::::: 87fe2d543f817300e13f0ea683f38c122737856e io: change inX() to have their own IO barrier overrides

:::::: TO: Sinan Kaya <okaya@codeaurora.org>
:::::: CC: Arnd Bergmann <arnd@arndb.de>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests

             reply	other threads:[~2023-01-30  5:24 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-30  5:23 kernel test robot [this message]
  -- strict thread matches above, loose matches on Subject: below --
2023-03-22 16:45 include/asm-generic/io.h:464:31: error: performing pointer arithmetic on a null pointer has undefined behavior kernel test robot
2023-01-12 15:35 kernel test robot
2022-12-06  0:46 kernel test robot

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