Hi Pan,

[auto build test ERROR on powerpc/next]
[also build test ERROR on v4.8-rc7 next-20160916]
[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/Pan-Xinhui/Implement-qspinlock-pv-qspinlock-on-ppc/20160919-133130
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-allyesconfig (attached as .config)
compiler: powerpc64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
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=powerpc 

All errors (new ones prefixed by >>):

   In file included from include/uapi/linux/stddef.h:1:0,
                    from include/linux/stddef.h:4,
                    from include/uapi/linux/posix_types.h:4,
                    from include/uapi/linux/types.h:13,
                    from include/linux/types.h:5,
                    from include/linux/smp.h:10,
                    from kernel/locking/qspinlock.c:25:
   In function '__xchg_relaxed',
       inlined from 'queued_spin_lock_slowpath' at 
kernel/locking/qspinlock.c:184:14:
>> include/linux/compiler.h:491:38: error: call to '__compiletime_assert_113' 
>> declared with attribute error: Unsupported size for __xchg_local
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
                                         ^
   include/linux/compiler.h:474:4: note: in definition of macro 
'__compiletime_assert'
       prefix ## suffix();    \
       ^~~~~~
   include/linux/compiler.h:491:2: note: in expansion of macro 
'_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
     ^~~~~~~~~~~~~~~~~~~
   include/linux/bug.h:51:37: note: in expansion of macro 'compiletime_assert'
    #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                        ^~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/cmpxchg.h:113:2: note: in expansion of macro 
'BUILD_BUG_ON_MSG'
     BUILD_BUG_ON_MSG(1, "Unsupported size for __xchg_local");
     ^~~~~~~~~~~~~~~~

vim +/__compiletime_assert_113 +491 include/linux/compiler.h

9a8ab1c3 Daniel Santos  2013-02-21  475                 
__compiletime_error_fallback(__cond);                   \
9a8ab1c3 Daniel Santos  2013-02-21  476         } while (0)
9a8ab1c3 Daniel Santos  2013-02-21  477  
9a8ab1c3 Daniel Santos  2013-02-21  478  #define _compiletime_assert(condition, 
msg, prefix, suffix) \
9a8ab1c3 Daniel Santos  2013-02-21  479         __compiletime_assert(condition, 
msg, prefix, suffix)
9a8ab1c3 Daniel Santos  2013-02-21  480  
9a8ab1c3 Daniel Santos  2013-02-21  481  /**
9a8ab1c3 Daniel Santos  2013-02-21  482   * compiletime_assert - break build 
and emit msg if condition is false
9a8ab1c3 Daniel Santos  2013-02-21  483   * @condition: a compile-time constant 
condition to check
9a8ab1c3 Daniel Santos  2013-02-21  484   * @msg:       a message to emit if 
condition is false
9a8ab1c3 Daniel Santos  2013-02-21  485   *
9a8ab1c3 Daniel Santos  2013-02-21  486   * In tradition of POSIX assert, this 
macro will break the build if the
9a8ab1c3 Daniel Santos  2013-02-21  487   * supplied condition is *false*, 
emitting the supplied error message if the
9a8ab1c3 Daniel Santos  2013-02-21  488   * compiler has support to do so.
9a8ab1c3 Daniel Santos  2013-02-21  489   */
9a8ab1c3 Daniel Santos  2013-02-21  490  #define compiletime_assert(condition, 
msg) \
9a8ab1c3 Daniel Santos  2013-02-21 @491         _compiletime_assert(condition, 
msg, __compiletime_assert_, __LINE__)
9a8ab1c3 Daniel Santos  2013-02-21  492  
47933ad4 Peter Zijlstra 2013-11-06  493  #define 
compiletime_assert_atomic_type(t)                              \
47933ad4 Peter Zijlstra 2013-11-06  494         
compiletime_assert(__native_word(t),                            \
47933ad4 Peter Zijlstra 2013-11-06  495                 "Need native word sized 
stores/loads for atomicity.")
47933ad4 Peter Zijlstra 2013-11-06  496  
9c3cdc1f Linus Torvalds 2008-05-10  497  /*
9c3cdc1f Linus Torvalds 2008-05-10  498   * Prevent the compiler from merging 
or refetching accesses.  The compiler
9c3cdc1f Linus Torvalds 2008-05-10  499   * is also forbidden from reordering 
successive instances of ACCESS_ONCE(),

:::::: The code at line 491 was first introduced by commit
:::::: 9a8ab1c39970a4938a72d94e6fd13be88a797590 bug.h, compiler.h: introduce 
compiletime_assert & BUILD_BUG_ON_MSG

:::::: TO: Daniel Santos <daniel.san...@pobox.com>
:::::: CC: Linus Torvalds <torva...@linux-foundation.org>

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

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