Hi Oliver,
FYI, the error/warning still remains.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 8b12a62a4e3ed4ae99c715034f557eb391d6b196
commit: c7b74967799b1af52b3045d69d4c26836b2d41de can: replace can_dlc as variable/element for payload length
date: 4 months ago
config: arm-randconfig-r004-20210318 (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 <[email protected]>
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_511' 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_511 +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 <[email protected]>
:::::: CC: Will Deacon <[email protected]>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[email protected]
On 19.03.21 09:06, kernel test robot wrote:
> Hi Oliver,
>
> FYI, the error/warning still remains.
>
Hm - I have no clue either.
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: 8b12a62a4e3ed4ae99c715034f557eb391d6b196
> commit: c7b74967799b1af52b3045d69d4c26836b2d41de can: replace can_dlc as variable/element for payload length
The patch which introduced the union I suspected to be the problem is
some commits earlier ...
> net/can/af_can.c:891:2: note: in expansion of macro 'BUILD_BUG_ON'
> 891 | BUILD_BUG_ON(offsetof(struct can_frame, len) !=
> | ^~~~~~~~~~~~
The only idea which does not change the functionality but may help the
macro expansion is to revert the change from "can_dlc" -> "len" in
af_can.c :
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/diff/net/can/af_can.c?id=c7b74967799b1af52b3045d69d4c26836b2d41de
Is it possible for you to revert that single line for a test?
diff --git a/net/can/af_can.c b/net/can/af_can.c
index cce2af10eb3e..1c95ede2c9a6 100644
--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -865,11 +865,11 @@ static struct pernet_operations can_pernet_ops
__read_mostly = {
static __init int can_init(void)
{
int err;
/* check for correct padding to be able to use the structs
similarly */
- BUILD_BUG_ON(offsetof(struct can_frame, len) !=
+ BUILD_BUG_ON(offsetof(struct can_frame, can_dlc) !=
offsetof(struct canfd_frame, len) ||
offsetof(struct can_frame, data) !=
offsetof(struct canfd_frame, data));
pr_info("can: controller area network core\n");
Unfortunately I was not able to reproduce the issue here.
Best regards,
Oliver
>
>
> vim +/__compiletime_assert_511 +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 <[email protected]>
> :::::: CC: Will Deacon <[email protected]>
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/[email protected]
>