[drm-intel:for-linux-next 4/5] include/linux/compiler.h:529:38: error: call to '__compiletime_assert_1626' declared with attribute error: BUILD_BUG_ON failed: (fast_timeout_us) > 50000

[kbuild test robot <fengguang.wu@intel.com>]

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tree:   git://anongit.freedesktop.org/drm-intel for-linux-next
head:   bea4e4a4f831df1c104be60b3caa7205ba1bb4f9
commit: 1d1a9774e40414148ecebbdb713746bfb6f9a561 [4/5] drm/i915: Extend intel_wait_for_register_fw() with fast timeout
config: x86_64-randconfig-h0-04080942 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout 1d1a9774e40414148ecebbdb713746bfb6f9a561
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All error/warnings (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/uapi/drm/drm.h:41,
                    from include/uapi/drm/i915_drm.h:30,
                    from drivers/gpu/drm/i915/i915_drv.h:33,
                    from drivers/gpu/drm/i915/intel_uncore.c:24:
   drivers/gpu/drm/i915/intel_uncore.c: In function '__intel_wait_for_register_fw':
>> include/linux/compiler.h:529:38: error: call to '__compiletime_assert_1626' declared with attribute error: BUILD_BUG_ON failed: (fast_timeout_us) > 50000
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
                                         ^
   include/linux/compiler.h:512:4: note: in definition of macro '__compiletime_assert'
       prefix ## suffix();    \
       ^
   include/linux/compiler.h:529:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
     ^
   include/linux/bug.h:54:37: note: in expansion of macro 'compiletime_assert'
    #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                        ^
   include/linux/bug.h:78:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
     BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
     ^
>> drivers/gpu/drm/i915/intel_drv.h:91:2: note: in expansion of macro 'BUILD_BUG_ON'
     BUILD_BUG_ON((US) > 50000); \
     ^
>> drivers/gpu/drm/i915/intel_uncore.c:1626:9: note: in expansion of macro '_wait_for_atomic'
      ret = _wait_for_atomic(done, fast_timeout_us, 0);
            ^

vim +/__compiletime_assert_1626 +529 include/linux/compiler.h

9a8ab1c3 Daniel Santos  2013-02-21  523   *
9a8ab1c3 Daniel Santos  2013-02-21  524   * In tradition of POSIX assert, this macro will break the build if the
9a8ab1c3 Daniel Santos  2013-02-21  525   * supplied condition is *false*, emitting the supplied error message if the
9a8ab1c3 Daniel Santos  2013-02-21  526   * compiler has support to do so.
9a8ab1c3 Daniel Santos  2013-02-21  527   */
9a8ab1c3 Daniel Santos  2013-02-21  528  #define compiletime_assert(condition, msg) \
9a8ab1c3 Daniel Santos  2013-02-21 @529  	_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
9a8ab1c3 Daniel Santos  2013-02-21  530  
47933ad4 Peter Zijlstra 2013-11-06  531  #define compiletime_assert_atomic_type(t)				\
47933ad4 Peter Zijlstra 2013-11-06  532  	compiletime_assert(__native_word(t),				\

:::::: The code at line 529 was first introduced by commit
:::::: 9a8ab1c39970a4938a72d94e6fd13be88a797590 bug.h, compiler.h: introduce compiletime_assert & BUILD_BUG_ON_MSG

:::::: TO: Daniel Santos <daniel.santos@pobox.com>
:::::: CC: Linus Torvalds <torvalds@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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