On 13.02.21 20:57, kernel test robot wrote:
Hi Oliver,
FYI, the error/warning still remains.
Yes, because of the this union, see:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/uapi/linux/can.h?id=c7b74967799b1af52b3045d69d4c26836b2d41de#n109
Maybe I was not clear on this.
On ARM the BUILD_BUG_ON() seems to stumble about this new union{}
introduced here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/include/uapi/linux/can.h?id=ea7800565a128c1adafa1791ce80afd6016fe21c
So every commit after ea7800565a128c1 ("can: add optional DLC element to
Classical CAN frame structure") should show this issue UNTIL
BUILD_BUG_ON() is fixed on ARM (my assuption) so that the union{} is
supported like on the x86.
Best,
Oliver
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 <l...@intel.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 <w...@kernel.org>
:::::: CC: Will Deacon <w...@kernel.org>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org
