linux-kernel - Re: [PATCH v4 2/2] kernel.h: handle pointers to arrays better in container

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Date:   Wed, 24 May 2017 08:54:02 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Ian Abbott <abbotti@....co.uk>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Nazarewicz <mina86@...a86.com>,
        Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>,
        Borislav Petkov <bp@...e.de>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Johannes Berg <johannes.berg@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Alexander Potapenko <glider@...gle.com>,
        Ian Abbott <abbotti@....co.uk>
Subject: Re: [PATCH v4 2/2] kernel.h: handle pointers to arrays better in
 container_of()

Hi Ian,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.12-rc2 next-20170523]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Ian-Abbott/asm-generic-bug-h-declare-struct-pt_regs-before-function-prototype/20170524-070310
config: i386-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All error/warnings (new ones prefixed by >>):

   In file included from include/linux/kernel.h:14:0,
                    from include/asm-generic/bug.h:15,
                    from arch/x86/include/asm/bug.h:81,
                    from drivers/block/drbd/drbd_interval.c:1:
>> include/linux/bug.h:103:47: warning: 'struct bug_entry' declared inside parameter list will not be visible outside of this definition or declaration
    static inline int is_warning_bug(const struct bug_entry *bug)
                                                  ^~~~~~~~~
   include/linux/bug.h: In function 'is_warning_bug':
>> include/linux/bug.h:105:12: error: dereferencing pointer to incomplete type 'const struct bug_entry'
     return bug->flags & BUGFLAG_WARNING;
               ^~

vim +105 include/linux/bug.h

ff20c2e0 Kirill A. Shutemov  2016-03-01   97  
35edd910 Paul Gortmaker      2011-11-16   98  #endif	/* __CHECKER__ */
35edd910 Paul Gortmaker      2011-11-16   99  
7664c5a1 Jeremy Fitzhardinge 2006-12-08  100  #ifdef CONFIG_GENERIC_BUG
7664c5a1 Jeremy Fitzhardinge 2006-12-08  101  #include <asm-generic/bug.h>
7664c5a1 Jeremy Fitzhardinge 2006-12-08  102  
7664c5a1 Jeremy Fitzhardinge 2006-12-08 @103  static inline int is_warning_bug(const struct bug_entry *bug)
7664c5a1 Jeremy Fitzhardinge 2006-12-08  104  {
7664c5a1 Jeremy Fitzhardinge 2006-12-08 @105  	return bug->flags & BUGFLAG_WARNING;
7664c5a1 Jeremy Fitzhardinge 2006-12-08  106  }
7664c5a1 Jeremy Fitzhardinge 2006-12-08  107  
19d43626 Peter Zijlstra      2017-02-25  108  struct bug_entry *find_bug(unsigned long bugaddr);

:::::: The code at line 105 was first introduced by commit
:::::: 7664c5a1da4711bb6383117f51b94c8dc8f3f1cd [PATCH] Generic BUG implementation

:::::: TO: Jeremy Fitzhardinge <jeremy@...p.org>
:::::: CC: Linus Torvalds <torvalds@...dy.osdl.org>

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