linux-kernel - include/linux/compiler.h:339:38: error: call to '__compiletime_assert_1650' declared with attribute error: BUILD_BUG_ON failed: plen_reg(nfp_prog) != reg_b(STATIC_REG_PKT

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Date:   Mon, 17 Sep 2018 15:25:32 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Daniel Borkmann <daniel@...earbox.net>,
        Quentin Monnet <quentin.monnet@...ronome.com>
Subject: include/linux/compiler.h:339:38: error: call to
 '__compiletime_assert_1650' declared with attribute error: BUILD_BUG_ON
 failed: plen_reg(nfp_prog) != reg_b(STATIC_REG_PKT_LEN)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   c0747ad363fff90c2edf490fc089e3ae0920b410
commit: 0c26159352ba1cdc5a8c8d74131cc19cdfdf9371 nfp: bpf: xdp_adjust_tail support
date:   6 weeks ago
config: i386-randconfig-sb0-09171405 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout 0c26159352ba1cdc5a8c8d74131cc19cdfdf9371
        # save the attached .config to linux build tree
        make ARCH=i386 

All error/warnings (new ones prefixed by >>):

   In file included from include/asm-generic/bug.h:5:0,
                    from arch/x86/include/asm/bug.h:83,
                    from include/linux/bug.h:5,
                    from drivers/net/ethernet/netronome/nfp/bpf/jit.c:36:
   In function 'adjust_tail.isra.11',
       inlined from 'call' at drivers/net/ethernet/netronome/nfp/bpf/jit.c:3090:3:
>> include/linux/compiler.h:339:38: error: call to '__compiletime_assert_1650' declared with attribute error: BUILD_BUG_ON failed: plen_reg(nfp_prog) != reg_b(STATIC_REG_PKT_LEN)
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
                                         ^
   include/linux/compiler.h:319:4: note: in definition of macro '__compiletime_assert'
       prefix ## suffix();    \
       ^
   include/linux/compiler.h:339:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
     ^
   include/linux/build_bug.h:45:37: note: in expansion of macro 'compiletime_assert'
    #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
                                        ^
   include/linux/build_bug.h:69:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
     BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
     ^
>> drivers/net/ethernet/netronome/nfp/bpf/jit.c:1650:2: note: in expansion of macro 'BUILD_BUG_ON'
     BUILD_BUG_ON(plen_reg(nfp_prog) != reg_b(STATIC_REG_PKT_LEN));
     ^

vim +/__compiletime_assert_1650 +339 include/linux/compiler.h

9a8ab1c3 Daniel Santos 2013-02-21  325  
9a8ab1c3 Daniel Santos 2013-02-21  326  #define _compiletime_assert(condition, msg, prefix, suffix) \
9a8ab1c3 Daniel Santos 2013-02-21  327  	__compiletime_assert(condition, msg, prefix, suffix)
9a8ab1c3 Daniel Santos 2013-02-21  328  
9a8ab1c3 Daniel Santos 2013-02-21  329  /**
9a8ab1c3 Daniel Santos 2013-02-21  330   * compiletime_assert - break build and emit msg if condition is false
9a8ab1c3 Daniel Santos 2013-02-21  331   * @condition: a compile-time constant condition to check
9a8ab1c3 Daniel Santos 2013-02-21  332   * @msg:       a message to emit if condition is false
9a8ab1c3 Daniel Santos 2013-02-21  333   *
9a8ab1c3 Daniel Santos 2013-02-21  334   * In tradition of POSIX assert, this macro will break the build if the
9a8ab1c3 Daniel Santos 2013-02-21  335   * supplied condition is *false*, emitting the supplied error message if the
9a8ab1c3 Daniel Santos 2013-02-21  336   * compiler has support to do so.
9a8ab1c3 Daniel Santos 2013-02-21  337   */
9a8ab1c3 Daniel Santos 2013-02-21  338  #define compiletime_assert(condition, msg) \
9a8ab1c3 Daniel Santos 2013-02-21 @339  	_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
9a8ab1c3 Daniel Santos 2013-02-21  340  

:::::: The code at line 339 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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