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Date: Sun, 17 Dec 2023 19:39:34 +0800
From: kernel test robot <lkp@intel.com>
To: Thomas =?iso-8859-1?Q?Wei=DFschuh?= <linux@weissschuh.net>
Cc: oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org,
	Jakub Kicinski <kuba@kernel.org>, Simon Horman <horms@kernel.org>
Subject: include/linux/compiler_types.h:397:45: error: call to
 '__compiletime_assert_810' declared with attribute error: BUILD_BUG_ON
 failed: skb_ext_total_length() > 255
Message-ID: <202312171924.4FozI5FG-lkp@intel.com>
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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   3b8a9b2e6809d281890dd0a1102dc14d2cd11caf
commit: 5d21d0a65b573507bae774708199328b38dedfe6 net: generalize calculation of skb extensions length
date:   4 months ago
config: um-randconfig-r025-20230617 (https://download.01.org/0day-ci/archive/20231217/202312171924.4FozI5FG-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231217/202312171924.4FozI5FG-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202312171924.4FozI5FG-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from <command-line>:
   In function 'skb_extensions_init',
       inlined from 'skb_init' at net/core/skbuff.c:4848:2:
>> include/linux/compiler_types.h:397:45: error: call to '__compiletime_assert_810' declared with attribute error: BUILD_BUG_ON failed: skb_ext_total_length() > 255
     397 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:378:25: note: in definition of macro '__compiletime_assert'
     378 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:397:9: note: in expansion of macro '_compiletime_assert'
     397 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
      39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:50:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
      50 |         BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
         |         ^~~~~~~~~~~~~~~~
   net/core/skbuff.c:4800:9: note: in expansion of macro 'BUILD_BUG_ON'
    4800 |         BUILD_BUG_ON(skb_ext_total_length() > 255);
         |         ^~~~~~~~~~~~


vim +/__compiletime_assert_810 +397 include/linux/compiler_types.h

eb5c2d4b45e3d2d Will Deacon 2020-07-21  383  
eb5c2d4b45e3d2d Will Deacon 2020-07-21  384  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2d Will Deacon 2020-07-21  385  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2d Will Deacon 2020-07-21  386  
eb5c2d4b45e3d2d Will Deacon 2020-07-21  387  /**
eb5c2d4b45e3d2d Will Deacon 2020-07-21  388   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2d Will Deacon 2020-07-21  389   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2d Will Deacon 2020-07-21  390   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2d Will Deacon 2020-07-21  391   *
eb5c2d4b45e3d2d Will Deacon 2020-07-21  392   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2d Will Deacon 2020-07-21  393   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2d Will Deacon 2020-07-21  394   * compiler has support to do so.
eb5c2d4b45e3d2d Will Deacon 2020-07-21  395   */
eb5c2d4b45e3d2d Will Deacon 2020-07-21  396  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2d Will Deacon 2020-07-21 @397  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2d Will Deacon 2020-07-21  398  

:::::: The code at line 397 was first introduced by commit
:::::: eb5c2d4b45e3d2d5d052ea6b8f1463976b1020d5 compiler.h: Move compiletime_assert() macros into compiler_types.h

:::::: TO: Will Deacon <will@kernel.org>
:::::: CC: Will Deacon <will@kernel.org>

-- 
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https://github.com/intel/lkp-tests/wiki