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* include/linux/compiler_types.h:699:45: error: call to '__compiletime_assert_881' declared with attribute error: BUILD_BUG_ON failed: sizeof_field(struct mptcp_ext, flags) != sizeof(u16)
@ 2026-07-03  3:51 kernel test robot
  2026-07-03  7:53 ` David Laight
  0 siblings, 1 reply; 2+ messages in thread
From: kernel test robot @ 2026-07-03  3:51 UTC (permalink / raw)
  To: Paolo Abeni
  Cc: oe-kbuild-all, linux-kernel, mptcp, matthieu.baerts,
	Jakub Kicinski, Matthieu Baerts (NGI0)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   51512e22efe813d8223de27f6fd02a8a48ea2323
commit: 5e939544f9d2b4d5c052a07cfcde97de44263946 mptcp: fix uninit-value in mptcp_established_options
date:   4 weeks ago
config: arm-randconfig-r051-20260702 (https://download.01.org/0day-ci/archive/20260703/202607031100.upQfRZTM-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260703/202607031100.upQfRZTM-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
| Fixes: 5e939544f9d2 ("mptcp: fix uninit-value in mptcp_established_options")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202607031100.upQfRZTM-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from <command-line>:
   In function 'mptcp_established_options_dss',
       inlined from 'mptcp_established_options' at net/mptcp/options.c:881:11:
>> include/linux/compiler_types.h:699:45: error: call to '__compiletime_assert_881' declared with attribute error: BUILD_BUG_ON failed: sizeof_field(struct mptcp_ext, flags) != sizeof(u16)
     699 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                             ^
   include/linux/compiler_types.h:680:25: note: in definition of macro '__compiletime_assert'
     680 |                         prefix ## suffix();                             \
         |                         ^~~~~~
   include/linux/compiler_types.h:699:9: note: in expansion of macro '_compiletime_assert'
     699 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^~~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:40:37: note: in expansion of macro 'compiletime_assert'
      40 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^~~~~~~~~~~~~~~~~~
   include/linux/build_bug.h:51:9: note: in expansion of macro 'BUILD_BUG_ON_MSG'
      51 |         BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
         |         ^~~~~~~~~~~~~~~~
   net/mptcp/options.c:576:9: note: in expansion of macro 'BUILD_BUG_ON'
     576 |         BUILD_BUG_ON(sizeof_field(struct mptcp_ext, flags) != sizeof(u16));
         |         ^~~~~~~~~~~~


vim +/__compiletime_assert_881 +699 include/linux/compiler_types.h

eb5c2d4b45e3d2 Will Deacon 2020-07-21  685  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  686  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21  687  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  688  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  689  /**
eb5c2d4b45e3d2 Will Deacon 2020-07-21  690   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  691   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2 Will Deacon 2020-07-21  692   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  693   *
eb5c2d4b45e3d2 Will Deacon 2020-07-21  694   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  695   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  696   * compiler has support to do so.
eb5c2d4b45e3d2 Will Deacon 2020-07-21  697   */
eb5c2d4b45e3d2 Will Deacon 2020-07-21  698  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21 @699  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  700  

:::::: The code at line 699 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>

--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

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2026-07-03  3:51 include/linux/compiler_types.h:699:45: error: call to '__compiletime_assert_881' declared with attribute error: BUILD_BUG_ON failed: sizeof_field(struct mptcp_ext, flags) != sizeof(u16) kernel test robot
2026-07-03  7:53 ` David Laight

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