netdev - [net-next:master 1179/1189] include/linux/compiler.h:447:38: error: call to '__compiletime_assert_243' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct dst_entry, _

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Date:	Fri, 21 Aug 2015 13:55:31 +0800
From:	kbuild test robot <fengguang.wu@...el.com>
To:	Jiri Benc <jbenc@...hat.com>
Cc:	kbuild-all@...org, netdev@...r.kernel.org
Subject: [net-next:master 1179/1189] include/linux/compiler.h:447:38: error:
 call to '__compiletime_assert_243' declared with attribute error:
 BUILD_BUG_ON failed: offsetof(struct dst_entry, __refcnt) & 63

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
head:   a9e01ed986aa80d3092134428f453072752da223
commit: 61adedf3e3f1d3f032c5a6a299978d91eff6d555 [1179/1189] route: move lwtunnel state to dst_entry
config: m68k-sun3_defconfig (attached as .config)
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
  git checkout 61adedf3e3f1d3f032c5a6a299978d91eff6d555
  # save the attached .config to linux build tree
  make.cross ARCH=m68k 

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/linux/list.h:4,
                    from include/linux/module.h:9,
                    from net/netfilter/nf_nat_core.c:11:
   In function 'dst_hold',
       inlined from 'nf_xfrm_me_harder' at net/netfilter/nf_nat_core.c:100:2:
>> include/linux/compiler.h:447:38: error: call to '__compiletime_assert_243' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct dst_entry, __refcnt) & 63
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
                                         ^
   include/linux/compiler.h:430:4: note: in definition of macro '__compiletime_assert'
       prefix ## suffix();    \
       ^
   include/linux/compiler.h:447:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
     ^
   include/linux/bug.h:50:37: note: in expansion of macro 'compiletime_assert'
    #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                        ^
   include/linux/bug.h:74:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
     BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
     ^
>> include/net/dst.h:243:2: note: in expansion of macro 'BUILD_BUG_ON'
     BUILD_BUG_ON(offsetof(struct dst_entry, __refcnt) & 63);
     ^

vim +/__compiletime_assert_243 +447 include/linux/compiler.h

9a8ab1c3 Daniel Santos  2013-02-21  441   *
9a8ab1c3 Daniel Santos  2013-02-21  442   * In tradition of POSIX assert, this macro will break the build if the
9a8ab1c3 Daniel Santos  2013-02-21  443   * supplied condition is *false*, emitting the supplied error message if the
9a8ab1c3 Daniel Santos  2013-02-21  444   * compiler has support to do so.
9a8ab1c3 Daniel Santos  2013-02-21  445   */
9a8ab1c3 Daniel Santos  2013-02-21  446  #define compiletime_assert(condition, msg) \
9a8ab1c3 Daniel Santos  2013-02-21 @447  	_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
9a8ab1c3 Daniel Santos  2013-02-21  448  
47933ad4 Peter Zijlstra 2013-11-06  449  #define compiletime_assert_atomic_type(t)				\
47933ad4 Peter Zijlstra 2013-11-06  450  	compiletime_assert(__native_word(t),				\

:::::: The code at line 447 was first introduced by commit
:::::: 9a8ab1c39970a4938a72d94e6fd13be88a797590 bug.h, compiler.h: introduce compiletime_assert & BUILD_BUG_ON_MSG

:::::: TO: Daniel Santos <daniel.santos@...ox.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

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