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Date:   Sun, 14 Feb 2021 03:57:59 +0800
From:   kernel test robot <lkp@...el.com>
To:     Oliver Hartkopp <socketcan@...tkopp.net>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: include/linux/compiler_types.h:315:38: error: call to
 '__compiletime_assert_515' declared with attribute error: BUILD_BUG_ON
 failed: offsetof(struct can_frame, len) != offsetof(struct canfd_frame, len)
 || offsetof(struct can_frame, data) != offsetof(struc...

Hi Oliver,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   dcc0b49040c70ad827a7f3d58a21b01fdb14e749
commit: c7b74967799b1af52b3045d69d4c26836b2d41de can: replace can_dlc as variable/element for payload length
date:   3 months ago
config: arm-randconfig-r013-20210214 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c7b74967799b1af52b3045d69d4c26836b2d41de
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout c7b74967799b1af52b3045d69d4c26836b2d41de
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   In file included from <command-line>:
   net/can/af_can.c: In function 'can_init':
>> include/linux/compiler_types.h:315:38: error: call to '__compiletime_assert_515' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct can_frame, len) != offsetof(struct canfd_frame, len) || offsetof(struct can_frame, data) != offsetof(struct canfd_frame, data)
     315 |  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |                                      ^
   include/linux/compiler_types.h:296:4: note: in definition of macro '__compiletime_assert'
     296 |    prefix ## suffix();    \
         |    ^~~~~~
   include/linux/compiler_types.h:315:2: note: in expansion of macro '_compiletime_assert'
     315 |  _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:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
      50 |  BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
         |  ^~~~~~~~~~~~~~~~
   net/can/af_can.c:891:2: note: in expansion of macro 'BUILD_BUG_ON'
     891 |  BUILD_BUG_ON(offsetof(struct can_frame, len) !=
         |  ^~~~~~~~~~~~


vim +/__compiletime_assert_515 +315 include/linux/compiler_types.h

eb5c2d4b45e3d2 Will Deacon 2020-07-21  301  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  302  #define _compiletime_assert(condition, msg, prefix, suffix) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21  303  	__compiletime_assert(condition, msg, prefix, suffix)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  304  
eb5c2d4b45e3d2 Will Deacon 2020-07-21  305  /**
eb5c2d4b45e3d2 Will Deacon 2020-07-21  306   * compiletime_assert - break build and emit msg if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  307   * @condition: a compile-time constant condition to check
eb5c2d4b45e3d2 Will Deacon 2020-07-21  308   * @msg:       a message to emit if condition is false
eb5c2d4b45e3d2 Will Deacon 2020-07-21  309   *
eb5c2d4b45e3d2 Will Deacon 2020-07-21  310   * In tradition of POSIX assert, this macro will break the build if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  311   * supplied condition is *false*, emitting the supplied error message if the
eb5c2d4b45e3d2 Will Deacon 2020-07-21  312   * compiler has support to do so.
eb5c2d4b45e3d2 Will Deacon 2020-07-21  313   */
eb5c2d4b45e3d2 Will Deacon 2020-07-21  314  #define compiletime_assert(condition, msg) \
eb5c2d4b45e3d2 Will Deacon 2020-07-21 @315  	_compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
eb5c2d4b45e3d2 Will Deacon 2020-07-21  316  

:::::: The code at line 315 was first introduced by commit
:::::: eb5c2d4b45e3d2d5d052ea6b8f1463976b1020d5 compiler.h: Move compiletime_assert() macros into compiler_types.h

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

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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