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Date:   Thu, 26 Oct 2017 20:22:36 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Clement Courbet <courbet@...gle.com>
Cc:     kbuild-all@...org, Arnd Bergmann <arnd@...db.de>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Yury Norov <ynorov@...iumnetworks.com>,
        Clement Courbet <courbet@...gle.com>,
        Ingo Molnar <mingo@...nel.org>, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] lib: optimize cpumask_next_and()

Hi Clement,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.14-rc6 next-20171018]
[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/Clement-Courbet/lib-optimize-cpumask_next_and/20171026-184850
config: m68k-allyesconfig (attached as .config)
compiler: m68k-linux-gcc (GCC) 4.9.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=m68k 

All errors (new ones prefixed by >>):

   lib/find_bit.c: In function 'find_next_and_bit':
>> lib/find_bit.c:92:2: error: implicit declaration of function '_find_next_bit' [-Werror=implicit-function-declaration]
     return _find_next_bit(addr1, addr2, size, offset, ~0UL);
     ^
   lib/find_bit.c:92:38: error: 'size' undeclared (first use in this function)
     return _find_next_bit(addr1, addr2, size, offset, ~0UL);
                                         ^
   lib/find_bit.c:92:38: note: each undeclared identifier is reported only once for each function it appears in
   lib/find_bit.c:92:44: error: 'offset' undeclared (first use in this function)
     return _find_next_bit(addr1, addr2, size, offset, ~0UL);
                                               ^
   lib/find_bit.c:93:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^
   cc1: some warnings being treated as errors

vim +/_find_next_bit +92 lib/find_bit.c

    86	
    87	#if !defined(find_next_and_bit)
    88	unsigned long find_next_and_bit(const unsigned long *addr1,
    89			const unsigned long *addr2, unsigned long nbits,
    90			unsigned long start)
    91	{
  > 92		return _find_next_bit(addr1, addr2, size, offset, ~0UL);
    93	}
    94	EXPORT_SYMBOL(find_next_and_bit);
    95	#endif
    96	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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