Hi Vineet,

[auto build test ERROR on arm64/for-next/core]
[cannot apply to linus/master linux/master v4.8-rc5 next-20160909]
[if your patch is applied to the wrong git tree, please drop us a note to help 
improve the system]
[Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for 
convenience) to record what (public, well-known) commit your patch series was 
built on]
[Check https://git-scm.com/docs/git-format-patch for more information]

url:    
https://github.com/0day-ci/linux/commits/Vineet-Gupta/atomic64-No-need-for-CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE/20160909-013936
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git 
for-next/core
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 4.9.0
reproduce:
        wget 
https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross
 -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=ia64 

All errors (new ones prefixed by >>):

   lib/atomic64_test.c: In function 'test_atomic64':
>> lib/atomic64_test.c:217:2: error: implicit declaration of function 
>> 'atomic64_dec_if_positive' [-Werror=implicit-function-declaration]
     BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
     ^
   cc1: some warnings being treated as errors

vim +/atomic64_dec_if_positive +217 lib/atomic64_test.c

86a89380 Luca Barbieri 2010-02-24  211          INIT(v0);
9efbcd59 Luca Barbieri 2010-03-01  212          BUG_ON(!atomic64_add_unless(&v, 
one, v1));
86a89380 Luca Barbieri 2010-02-24  213          r += one;
86a89380 Luca Barbieri 2010-02-24  214          BUG_ON(v.counter != r);
86a89380 Luca Barbieri 2010-02-24  215  
86a89380 Luca Barbieri 2010-02-24  216          INIT(onestwos);
86a89380 Luca Barbieri 2010-02-24 @217          
BUG_ON(atomic64_dec_if_positive(&v) != (onestwos - 1));
86a89380 Luca Barbieri 2010-02-24  218          r -= one;
86a89380 Luca Barbieri 2010-02-24  219          BUG_ON(v.counter != r);
86a89380 Luca Barbieri 2010-02-24  220  

:::::: The code at line 217 was first introduced by commit
:::::: 86a8938078a8bb518c5376de493e348c7490d506 lib: Add self-test for 
atomic64_t

:::::: TO: Luca Barbieri <l...@luca-barbieri.com>
:::::: CC: H. Peter Anvin <h...@zytor.com>

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

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