linux-kernel - Re: [PATCH v5 3/3] asm-generic/io.h: warn in inb() and friends with undefined PCI

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Date:   Mon, 10 May 2021 21:29:12 +0800
From:   kernel test robot <lkp@...el.com>
To:     Niklas Schnelle <schnelle@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Vineet Gupta <vgupta@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     kbuild-all@...ts.01.org, netdev@...r.kernel.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 v5 3/3] asm-generic/io.h: warn in inb() and friends with
 undefined PCI_IOBASE

Hi Niklas,

I love your patch! Perhaps something to improve:

[auto build test WARNING on soc/for-next]
[also build test WARNING on asm-generic/master v5.13-rc1 next-20210510]
[cannot apply to sparc-next/master]
[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/20210510-165435
base:   https://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git for-next
config: openrisc-randconfig-r025-20210510 (attached as .config)
compiler: or1k-linux-gcc (GCC) 9.3.0
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
        # https://github.com/0day-ci/linux/commit/fa75946a8988026bee808b5840438a3908f0a65b
        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/20210510-165435
        git checkout fa75946a8988026bee808b5840438a3908f0a65b
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=openrisc 

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

All warnings (new ones prefixed by >>):

   In file included from include/linux/kernel.h:10,
                    from include/linux/list.h:9,
                    from include/linux/module.h:12,
                    from drivers/net/arcnet/com20020.c:31:
   drivers/net/arcnet/com20020.c: In function 'com20020_reset':
>> include/linux/compiler.h:70:32: warning: 'inbyte' is used uninitialized in this function [-Wuninitialized]
      70 |   (__if_trace.miss_hit[1]++,1) :  \
         |                                ^
   drivers/net/arcnet/com20020.c:286:9: note: 'inbyte' was declared here
     286 |  u_char inbyte;
         |         ^~~~~~


vim +/inbyte +70 include/linux/compiler.h

a15fd609ad53a6 Linus Torvalds 2019-03-20  59  
a15fd609ad53a6 Linus Torvalds 2019-03-20  60  #define __trace_if_value(cond) ({			\
2bcd521a684cc9 Steven Rostedt 2008-11-21  61  	static struct ftrace_branch_data		\
e04462fb82f8dd Miguel Ojeda   2018-09-03  62  		__aligned(4)				\
33def8498fdde1 Joe Perches    2020-10-21  63  		__section("_ftrace_branch")		\
a15fd609ad53a6 Linus Torvalds 2019-03-20  64  		__if_trace = {				\
2bcd521a684cc9 Steven Rostedt 2008-11-21  65  			.func = __func__,		\
2bcd521a684cc9 Steven Rostedt 2008-11-21  66  			.file = __FILE__,		\
2bcd521a684cc9 Steven Rostedt 2008-11-21  67  			.line = __LINE__,		\
2bcd521a684cc9 Steven Rostedt 2008-11-21  68  		};					\
a15fd609ad53a6 Linus Torvalds 2019-03-20  69  	(cond) ?					\
a15fd609ad53a6 Linus Torvalds 2019-03-20 @70  		(__if_trace.miss_hit[1]++,1) :		\
a15fd609ad53a6 Linus Torvalds 2019-03-20  71  		(__if_trace.miss_hit[0]++,0);		\
a15fd609ad53a6 Linus Torvalds 2019-03-20  72  })
a15fd609ad53a6 Linus Torvalds 2019-03-20  73  

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

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