linux-kernel - Re: [PATCH v2 2/2] asm-generic/io.h: Silence -Wnull-pointer-arithmetic warning on PCI

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Date:   Fri, 16 Apr 2021 00:26:34 +0800
From:   kernel test robot <lkp@...el.com>
To:     Niklas Schnelle <schnelle@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>
Cc:     kbuild-all@...ts.01.org, Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: Re: [PATCH v2 2/2] asm-generic/io.h: Silence
 -Wnull-pointer-arithmetic warning on PCI_IOBASE

Hi Niklas,

I love your patch! Yet something to improve:

[auto build test ERROR on soc/for-next]
[also build test ERROR on sparc/master asm-generic/master v5.12-rc7 next-20210415]
[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/Niklas-Schnelle/asm-generic-io-h-Silence-Wnull-pointer-arithmetic-warning-on-PCI_IOBASE/20210415-203919
base:   https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git for-next
config: arc-randconfig-s031-20210415 (attached as .config)
compiler: arc-elf-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.3-280-g2cd6d34e-dirty
        # https://github.com/0day-ci/linux/commit/f0394115b166f960f12fc7bc48362d0d19f67883
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Niklas-Schnelle/asm-generic-io-h-Silence-Wnull-pointer-arithmetic-warning-on-PCI_IOBASE/20210415-203919
        git checkout f0394115b166f960f12fc7bc48362d0d19f67883
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=arc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   In file included from arch/arc/include/asm/io.h:233,
                    from drivers/w1/w1_io.c:6:
   include/asm-generic/io.h: In function '_inb':
>> include/asm-generic/io.h:465:2: error: implicit declaration of function 'WARN_ONCE' [-Werror=implicit-function-declaration]
     465 |  WARN_ONCE(1, "No I/O port support\n");
         |  ^~~~~~~~~
   cc1: some warnings being treated as errors


vim +/WARN_ONCE +465 include/asm-generic/io.h

   446	
   447	/*
   448	 * {in,out}{b,w,l}() access little endian I/O. {in,out}{b,w,l}_p() can be
   449	 * implemented on hardware that needs an additional delay for I/O accesses to
   450	 * take effect.
   451	 */
   452	
   453	#if !defined(inb) && !defined(_inb)
   454	#define _inb _inb
   455	static inline u8 _inb(unsigned long addr)
   456	{
   457	#ifdef PCI_IOBASE
   458		u8 val;
   459	
   460		__io_pbr();
   461		val = __raw_readb(PCI_IOBASE + addr);
   462		__io_par(val);
   463		return val;
   464	#else
 > 465		WARN_ONCE(1, "No I/O port support\n");
   466		return ~0;
   467	#endif
   468	}
   469	#endif
   470	

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

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