* include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512"
@ 2026-04-10 9:25 kernel test robot
2026-04-10 12:07 ` Bitterblue Smith
0 siblings, 1 reply; 5+ messages in thread
From: kernel test robot @ 2026-04-10 9:25 UTC (permalink / raw)
To: Bitterblue Smith; +Cc: oe-kbuild-all, linux-kernel, Ping-Ke Shih
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 9a9c8ce300cd3859cc87b408ef552cd697cc2ab7
commit: deb3ddeb18652118956fb581a39ac299e1ee5623 wifi: rtw88: Enable the new RTL8814AE/RTL8814AU drivers
date: 1 year, 1 month ago
config: arm-randconfig-001-20260410 (https://download.01.org/0day-ci/archive/20260410/202604101721.fsv5XmCX-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260410/202604101721.fsv5XmCX-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: deb3ddeb1865 ("wifi: rtw88: Enable the new RTL8814AE/RTL8814AU drivers")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202604101721.fsv5XmCX-lkp@intel.com/
All errors (new ones prefixed by >>):
In file included from include/linux/bitfield.h:10,
from include/linux/fortify-string.h:5,
from include/linux/string.h:389,
from include/linux/uuid.h:11,
from include/linux/mod_devicetable.h:14,
from include/linux/usb.h:5,
from drivers/net/wireless/realtek/rtw88/rtw8814a.c:5:
>> include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512"
#define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
#define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
^~~~~~~~~~~~~~~
drivers/net/wireless/realtek/rtw88/rtw8814a.h:58:1: note: in expansion of macro 'static_assert'
static_assert(sizeof(struct rtw8814a_efuse) == 512);
^~~~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw88xxa_efuse) == 512"
#define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
#define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
^~~~~~~~~~~~~~~
drivers/net/wireless/realtek/rtw88/rtw88xxa.h:64:1: note: in expansion of macro 'static_assert'
static_assert(sizeof(struct rtw88xxa_efuse) == 512);
^~~~~~~~~~~~~
--
In file included from include/linux/container_of.h:5,
from include/linux/list.h:5,
from include/linux/module.h:12,
from drivers/net/wireless/realtek/rtw88/rtw8814ae.c:5:
>> include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512"
#define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
#define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
^~~~~~~~~~~~~~~
drivers/net/wireless/realtek/rtw88/rtw8814a.h:58:1: note: in expansion of macro 'static_assert'
static_assert(sizeof(struct rtw8814a_efuse) == 512);
^~~~~~~~~~~~~
--
In file included from include/linux/bitfield.h:10,
from include/linux/fortify-string.h:5,
from include/linux/string.h:389,
from include/linux/uuid.h:11,
from include/linux/mod_devicetable.h:14,
from include/linux/usb.h:5,
from rtw8814a.c:5:
>> include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512"
#define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
#define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
^~~~~~~~~~~~~~~
rtw8814a.h:58:1: note: in expansion of macro 'static_assert'
static_assert(sizeof(struct rtw8814a_efuse) == 512);
^~~~~~~~~~~~~
>> include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw88xxa_efuse) == 512"
#define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
#define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
^~~~~~~~~~~~~~~
rtw88xxa.h:64:1: note: in expansion of macro 'static_assert'
static_assert(sizeof(struct rtw88xxa_efuse) == 512);
^~~~~~~~~~~~~
--
In file included from include/linux/container_of.h:5,
from include/linux/list.h:5,
from include/linux/module.h:12,
from rtw8814ae.c:5:
>> include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512"
#define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
^~~~~~~~~~~~~~
include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
#define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
^~~~~~~~~~~~~~~
rtw8814a.h:58:1: note: in expansion of macro 'static_assert'
static_assert(sizeof(struct rtw8814a_efuse) == 512);
^~~~~~~~~~~~~
vim +78 include/linux/build_bug.h
bc6245e5efd70c Ian Abbott 2017-07-10 60
6bab69c65013be Rasmus Villemoes 2019-03-07 61 /**
6bab69c65013be Rasmus Villemoes 2019-03-07 62 * static_assert - check integer constant expression at build time
6bab69c65013be Rasmus Villemoes 2019-03-07 63 *
6bab69c65013be Rasmus Villemoes 2019-03-07 64 * static_assert() is a wrapper for the C11 _Static_assert, with a
6bab69c65013be Rasmus Villemoes 2019-03-07 65 * little macro magic to make the message optional (defaulting to the
6bab69c65013be Rasmus Villemoes 2019-03-07 66 * stringification of the tested expression).
6bab69c65013be Rasmus Villemoes 2019-03-07 67 *
6bab69c65013be Rasmus Villemoes 2019-03-07 68 * Contrary to BUILD_BUG_ON(), static_assert() can be used at global
6bab69c65013be Rasmus Villemoes 2019-03-07 69 * scope, but requires the expression to be an integer constant
6bab69c65013be Rasmus Villemoes 2019-03-07 70 * expression (i.e., it is not enough that __builtin_constant_p() is
6bab69c65013be Rasmus Villemoes 2019-03-07 71 * true for expr).
6bab69c65013be Rasmus Villemoes 2019-03-07 72 *
6bab69c65013be Rasmus Villemoes 2019-03-07 73 * Also note that BUILD_BUG_ON() fails the build if the condition is
6bab69c65013be Rasmus Villemoes 2019-03-07 74 * true, while static_assert() fails the build if the expression is
6bab69c65013be Rasmus Villemoes 2019-03-07 75 * false.
6bab69c65013be Rasmus Villemoes 2019-03-07 76 */
6bab69c65013be Rasmus Villemoes 2019-03-07 77 #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
6bab69c65013be Rasmus Villemoes 2019-03-07 @78 #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
6bab69c65013be Rasmus Villemoes 2019-03-07 79
07a368b3f55a79 Maxim Levitsky 2022-10-25 80
:::::: The code at line 78 was first introduced by commit
:::::: 6bab69c65013bed5fce9f101a64a84d0385b3946 build_bug.h: add wrapper for _Static_assert
:::::: TO: Rasmus Villemoes <linux@rasmusvillemoes.dk>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512"
2026-04-10 9:25 include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512" kernel test robot
@ 2026-04-10 12:07 ` Bitterblue Smith
2026-04-10 12:14 ` Ping-Ke Shih
0 siblings, 1 reply; 5+ messages in thread
From: Bitterblue Smith @ 2026-04-10 12:07 UTC (permalink / raw)
To: kernel test robot; +Cc: oe-kbuild-all, linux-kernel, Ping-Ke Shih
On 10/04/2026 12:25, kernel test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: 9a9c8ce300cd3859cc87b408ef552cd697cc2ab7
> commit: deb3ddeb18652118956fb581a39ac299e1ee5623 wifi: rtw88: Enable the new RTL8814AE/RTL8814AU drivers
> date: 1 year, 1 month ago
> config: arm-randconfig-001-20260410 (https://download.01.org/0day-ci/archive/20260410/202604101721.fsv5XmCX-lkp@intel.com/config)
> compiler: arm-linux-gnueabi-gcc (GCC) 8.5.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260410/202604101721.fsv5XmCX-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: deb3ddeb1865 ("wifi: rtw88: Enable the new RTL8814AE/RTL8814AU drivers")
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202604101721.fsv5XmCX-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
> In file included from include/linux/bitfield.h:10,
> from include/linux/fortify-string.h:5,
> from include/linux/string.h:389,
> from include/linux/uuid.h:11,
> from include/linux/mod_devicetable.h:14,
> from include/linux/usb.h:5,
> from drivers/net/wireless/realtek/rtw88/rtw8814a.c:5:
>>> include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512"
struct rtw_2g_txpwr_idx is missing __packed. Could that be the reason
for the error? I don't see what else could be causing it.
> #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
> ^~~~~~~~~~~~~~
> include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
> #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
> ^~~~~~~~~~~~~~~
> drivers/net/wireless/realtek/rtw88/rtw8814a.h:58:1: note: in expansion of macro 'static_assert'
> static_assert(sizeof(struct rtw8814a_efuse) == 512);
> ^~~~~~~~~~~~~
>>> include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw88xxa_efuse) == 512"
> #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
> ^~~~~~~~~~~~~~
> include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
> #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
> ^~~~~~~~~~~~~~~
> drivers/net/wireless/realtek/rtw88/rtw88xxa.h:64:1: note: in expansion of macro 'static_assert'
> static_assert(sizeof(struct rtw88xxa_efuse) == 512);
> ^~~~~~~~~~~~~
> --
> In file included from include/linux/container_of.h:5,
> from include/linux/list.h:5,
> from include/linux/module.h:12,
> from drivers/net/wireless/realtek/rtw88/rtw8814ae.c:5:
>>> include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512"
> #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
> ^~~~~~~~~~~~~~
> include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
> #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
> ^~~~~~~~~~~~~~~
> drivers/net/wireless/realtek/rtw88/rtw8814a.h:58:1: note: in expansion of macro 'static_assert'
> static_assert(sizeof(struct rtw8814a_efuse) == 512);
> ^~~~~~~~~~~~~
> --
> In file included from include/linux/bitfield.h:10,
> from include/linux/fortify-string.h:5,
> from include/linux/string.h:389,
> from include/linux/uuid.h:11,
> from include/linux/mod_devicetable.h:14,
> from include/linux/usb.h:5,
> from rtw8814a.c:5:
>>> include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512"
> #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
> ^~~~~~~~~~~~~~
> include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
> #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
> ^~~~~~~~~~~~~~~
> rtw8814a.h:58:1: note: in expansion of macro 'static_assert'
> static_assert(sizeof(struct rtw8814a_efuse) == 512);
> ^~~~~~~~~~~~~
>>> include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw88xxa_efuse) == 512"
> #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
> ^~~~~~~~~~~~~~
> include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
> #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
> ^~~~~~~~~~~~~~~
> rtw88xxa.h:64:1: note: in expansion of macro 'static_assert'
> static_assert(sizeof(struct rtw88xxa_efuse) == 512);
> ^~~~~~~~~~~~~
> --
> In file included from include/linux/container_of.h:5,
> from include/linux/list.h:5,
> from include/linux/module.h:12,
> from rtw8814ae.c:5:
>>> include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512"
> #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
> ^~~~~~~~~~~~~~
> include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
> #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
> ^~~~~~~~~~~~~~~
> rtw8814a.h:58:1: note: in expansion of macro 'static_assert'
> static_assert(sizeof(struct rtw8814a_efuse) == 512);
> ^~~~~~~~~~~~~
>
>
> vim +78 include/linux/build_bug.h
>
> bc6245e5efd70c Ian Abbott 2017-07-10 60
> 6bab69c65013be Rasmus Villemoes 2019-03-07 61 /**
> 6bab69c65013be Rasmus Villemoes 2019-03-07 62 * static_assert - check integer constant expression at build time
> 6bab69c65013be Rasmus Villemoes 2019-03-07 63 *
> 6bab69c65013be Rasmus Villemoes 2019-03-07 64 * static_assert() is a wrapper for the C11 _Static_assert, with a
> 6bab69c65013be Rasmus Villemoes 2019-03-07 65 * little macro magic to make the message optional (defaulting to the
> 6bab69c65013be Rasmus Villemoes 2019-03-07 66 * stringification of the tested expression).
> 6bab69c65013be Rasmus Villemoes 2019-03-07 67 *
> 6bab69c65013be Rasmus Villemoes 2019-03-07 68 * Contrary to BUILD_BUG_ON(), static_assert() can be used at global
> 6bab69c65013be Rasmus Villemoes 2019-03-07 69 * scope, but requires the expression to be an integer constant
> 6bab69c65013be Rasmus Villemoes 2019-03-07 70 * expression (i.e., it is not enough that __builtin_constant_p() is
> 6bab69c65013be Rasmus Villemoes 2019-03-07 71 * true for expr).
> 6bab69c65013be Rasmus Villemoes 2019-03-07 72 *
> 6bab69c65013be Rasmus Villemoes 2019-03-07 73 * Also note that BUILD_BUG_ON() fails the build if the condition is
> 6bab69c65013be Rasmus Villemoes 2019-03-07 74 * true, while static_assert() fails the build if the expression is
> 6bab69c65013be Rasmus Villemoes 2019-03-07 75 * false.
> 6bab69c65013be Rasmus Villemoes 2019-03-07 76 */
> 6bab69c65013be Rasmus Villemoes 2019-03-07 77 #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
> 6bab69c65013be Rasmus Villemoes 2019-03-07 @78 #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
> 6bab69c65013be Rasmus Villemoes 2019-03-07 79
> 07a368b3f55a79 Maxim Levitsky 2022-10-25 80
>
> :::::: The code at line 78 was first introduced by commit
> :::::: 6bab69c65013bed5fce9f101a64a84d0385b3946 build_bug.h: add wrapper for _Static_assert
>
> :::::: TO: Rasmus Villemoes <linux@rasmusvillemoes.dk>
> :::::: CC: Linus Torvalds <torvalds@linux-foundation.org>
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512"
2026-04-10 12:07 ` Bitterblue Smith
@ 2026-04-10 12:14 ` Ping-Ke Shih
2026-04-11 15:29 ` Geert Uytterhoeven
0 siblings, 1 reply; 5+ messages in thread
From: Ping-Ke Shih @ 2026-04-10 12:14 UTC (permalink / raw)
To: Bitterblue Smith, kernel test robot
Cc: oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org
Bitterblue Smith <rtl8821cerfe2@gmail.com> wrote:
> On 10/04/2026 12:25, kernel test robot wrote:
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head: 9a9c8ce300cd3859cc87b408ef552cd697cc2ab7
> > commit: deb3ddeb18652118956fb581a39ac299e1ee5623 wifi: rtw88: Enable the new RTL8814AE/RTL8814AU drivers
> > date: 1 year, 1 month ago
> > config: arm-randconfig-001-20260410 (https://download.01.org/0day-ci/archive/20260410/202604101721.fsv5XmCX-lkp@intel.com/config)
> > compiler: arm-linux-gnueabi-gcc (GCC) 8.5.0
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260410/202604101721.fsv5XmCX-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: deb3ddeb1865 ("wifi: rtw88: Enable the new RTL8814AE/RTL8814AU drivers")
> > | Reported-by: kernel test robot <lkp@intel.com>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202604101721.fsv5XmCX-lkp@intel.com/
> >
> > All errors (new ones prefixed by >>):
> >
> > In file included from include/linux/bitfield.h:10,
> > from include/linux/fortify-string.h:5,
> > from include/linux/string.h:389,
> > from include/linux/uuid.h:11,
> > from include/linux/mod_devicetable.h:14,
> > from include/linux/usb.h:5,
> > from drivers/net/wireless/realtek/rtw88/rtw8814a.c:5:
> >>> include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512"
>
> struct rtw_2g_txpwr_idx is missing __packed. Could that be the reason
> for the error? I don't see what else could be causing it.
>
I also found that flaw, but it isn't cause. I download cross compiler
to build arm on my x86, and address the cause is:
diff --git a/drivers/net/wireless/realtek/rtw88/rtw8814a.h b/drivers/net/wireless/realtek/rtw88/rtw8814a.h
index c57c7c8f915e..7f2260117487 100644
--- a/drivers/net/wireless/realtek/rtw88/rtw8814a.h
+++ b/drivers/net/wireless/realtek/rtw88/rtw8814a.h
@@ -51,10 +51,15 @@ struct rtw8814a_efuse {
union {
struct rtw8814au_efuse u;
struct rtw8814ae_efuse e;
- };
+ } __packed;
u8 res5[0x122]; /* 0xde */
} __packed;
I will send a patch soon.
Ping-Ke
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512"
2026-04-10 12:14 ` Ping-Ke Shih
@ 2026-04-11 15:29 ` Geert Uytterhoeven
2026-04-13 0:48 ` Ping-Ke Shih
0 siblings, 1 reply; 5+ messages in thread
From: Geert Uytterhoeven @ 2026-04-11 15:29 UTC (permalink / raw)
To: Ping-Ke Shih
Cc: Bitterblue Smith, kernel test robot,
oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org
Hi Ping-Ke,
On Fri, 10 Apr 2026 at 14:15, Ping-Ke Shih <pkshih@realtek.com> wrote:
> Bitterblue Smith <rtl8821cerfe2@gmail.com> wrote:
> > On 10/04/2026 12:25, kernel test robot wrote:
> > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > > head: 9a9c8ce300cd3859cc87b408ef552cd697cc2ab7
> > > commit: deb3ddeb18652118956fb581a39ac299e1ee5623 wifi: rtw88: Enable the new RTL8814AE/RTL8814AU drivers
> > > date: 1 year, 1 month ago
> > > config: arm-randconfig-001-20260410 (https://download.01.org/0day-ci/archive/20260410/202604101721.fsv5XmCX-lkp@intel.com/config)
> > > compiler: arm-linux-gnueabi-gcc (GCC) 8.5.0
> > > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260410/202604101721.fsv5XmCX-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: deb3ddeb1865 ("wifi: rtw88: Enable the new RTL8814AE/RTL8814AU drivers")
> > > | Reported-by: kernel test robot <lkp@intel.com>
> > > | Closes: https://lore.kernel.org/oe-kbuild-all/202604101721.fsv5XmCX-lkp@intel.com/
> > >
> > > All errors (new ones prefixed by >>):
> > >
> > > In file included from include/linux/bitfield.h:10,
> > > from include/linux/fortify-string.h:5,
> > > from include/linux/string.h:389,
> > > from include/linux/uuid.h:11,
> > > from include/linux/mod_devicetable.h:14,
> > > from include/linux/usb.h:5,
> > > from drivers/net/wireless/realtek/rtw88/rtw8814a.c:5:
> > >>> include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512"
> >
> > struct rtw_2g_txpwr_idx is missing __packed. Could that be the reason
> > for the error? I don't see what else could be causing it.
> >
>
> I also found that flaw, but it isn't cause. I download cross compiler
> to build arm on my x86, and address the cause is:
>
> diff --git a/drivers/net/wireless/realtek/rtw88/rtw8814a.h b/drivers/net/wireless/realtek/rtw88/rtw8814a.h
> index c57c7c8f915e..7f2260117487 100644
> --- a/drivers/net/wireless/realtek/rtw88/rtw8814a.h
> +++ b/drivers/net/wireless/realtek/rtw88/rtw8814a.h
> @@ -51,10 +51,15 @@ struct rtw8814a_efuse {
> union {
> struct rtw8814au_efuse u;
> struct rtw8814ae_efuse e;
> - };
> + } __packed;
How can that make a difference?
Both rtw8814au_efuse and rtw8814ae_efuse contain just (the same number
of) bytes, so __packed on the union should not make any difference?
Moreover, rtw8814au_efuse and rtw8814ae_efuse are already tagged with
__packed, which should also not make any difference. Someone's been
sprinkling too many __packed all over the place?
> u8 res5[0x122]; /* 0xde */
> } __packed;
>
> I will send a patch soon.
>
> Ping-Ke
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 5+ messages in thread
* RE: include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512"
2026-04-11 15:29 ` Geert Uytterhoeven
@ 2026-04-13 0:48 ` Ping-Ke Shih
0 siblings, 0 replies; 5+ messages in thread
From: Ping-Ke Shih @ 2026-04-13 0:48 UTC (permalink / raw)
To: Geert Uytterhoeven
Cc: Bitterblue Smith, kernel test robot,
oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org
Hi Geert,
> Hi Ping-Ke,
>
> On Fri, 10 Apr 2026 at 14:15, Ping-Ke Shih <pkshih@realtek.com> wrote:
> > Bitterblue Smith <rtl8821cerfe2@gmail.com> wrote:
> > > On 10/04/2026 12:25, kernel test robot wrote:
> > > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > > > head: 9a9c8ce300cd3859cc87b408ef552cd697cc2ab7
> > > > commit: deb3ddeb18652118956fb581a39ac299e1ee5623 wifi: rtw88: Enable the new RTL8814AE/RTL8814AU
> drivers
> > > > date: 1 year, 1 month ago
> > > > config: arm-randconfig-001-20260410
> (https://download.01.org/0day-ci/archive/20260410/202604101721.fsv5XmCX-lkp@intel.com/config)
> > > > compiler: arm-linux-gnueabi-gcc (GCC) 8.5.0
> > > > reproduce (this is a W=1 build):
> (https://download.01.org/0day-ci/archive/20260410/202604101721.fsv5XmCX-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: deb3ddeb1865 ("wifi: rtw88: Enable the new RTL8814AE/RTL8814AU drivers")
> > > > | Reported-by: kernel test robot <lkp@intel.com>
> > > > | Closes: https://lore.kernel.org/oe-kbuild-all/202604101721.fsv5XmCX-lkp@intel.com/
> > > >
> > > > All errors (new ones prefixed by >>):
> > > >
> > > > In file included from include/linux/bitfield.h:10,
> > > > from include/linux/fortify-string.h:5,
> > > > from include/linux/string.h:389,
> > > > from include/linux/uuid.h:11,
> > > > from include/linux/mod_devicetable.h:14,
> > > > from include/linux/usb.h:5,
> > > > from drivers/net/wireless/realtek/rtw88/rtw8814a.c:5:
> > > >>> include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse)
> == 512"
> > >
> > > struct rtw_2g_txpwr_idx is missing __packed. Could that be the reason
> > > for the error? I don't see what else could be causing it.
> > >
> >
> > I also found that flaw, but it isn't cause. I download cross compiler
> > to build arm on my x86, and address the cause is:
> >
> > diff --git a/drivers/net/wireless/realtek/rtw88/rtw8814a.h
> b/drivers/net/wireless/realtek/rtw88/rtw8814a.h
> > index c57c7c8f915e..7f2260117487 100644
> > --- a/drivers/net/wireless/realtek/rtw88/rtw8814a.h
> > +++ b/drivers/net/wireless/realtek/rtw88/rtw8814a.h
> > @@ -51,10 +51,15 @@ struct rtw8814a_efuse {
> > union {
> > struct rtw8814au_efuse u;
> > struct rtw8814ae_efuse e;
> > - };
> > + } __packed;
>
> How can that make a difference?
> Both rtw8814au_efuse and rtw8814ae_efuse contain just (the same number
> of) bytes, so __packed on the union should not make any difference?
> Moreover, rtw8814au_efuse and rtw8814ae_efuse are already tagged with
> __packed, which should also not make any difference. Someone's been
> sprinkling too many __packed all over the place?
I have similar thought as yours, but arm-linux-gnueabi-gcc compiler seems
have special treatment with union. For this case, without __packed
the offset of followed field res5 will become 0xe0.
When investing this error, I also found another waning [1].
I don't know why the compiler treats the union so special, and I fix
them by experimental results.
[1] https://lore.kernel.org/linux-wireless/20260411072509.1556635-1-pkshih@realtek.com/T/#u
>
> > u8 res5[0x122]; /* 0xde */
> > } __packed;
> >
> > I will send a patch soon.
> >
> > Ping-Ke
>
> Gr{oetje,eeting}s,
>
> Geert
Ping-Ke
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2026-04-13 0:48 UTC | newest]
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2026-04-10 9:25 include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512" kernel test robot
2026-04-10 12:07 ` Bitterblue Smith
2026-04-10 12:14 ` Ping-Ke Shih
2026-04-11 15:29 ` Geert Uytterhoeven
2026-04-13 0:48 ` Ping-Ke Shih
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