include/asm-generic/io.h:464:31: error: performing pointer arithmetic on a null pointer has undefined behavior

kernel test robot
2023-03-22T16:45:50Z

head: a1effab7a3a35a837dd9d2b974a1bc4939df1ad5
commit: 13e920d93e37fcaef4a9309515798a3cae9dcf19 net: wwan: t7xx: Add core components
date: 11 months ago
config: s390-randconfig-r001-20230322 (https://download.01.org/0day-ci/archive/20230323/202303230040.6r3jj0VE-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 67409911353323ca5edf2049ef0df54132fa1ca7)
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/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303230040.6r3jj0VE-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>

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