Re: include/linux/build_bug.h:78:41: error: static assertion failed: "sizeof(struct rtw8814a_efuse) == 512"

From: Bitterblue Smith

Date: Fri Apr 10 2026 - 08:07:25 EST

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@xxxxxxxxx/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@xxxxxxxxx/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@xxxxxxxxx>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202604101721.fsv5XmCX-lkp@xxxxxxxxx/
>
> 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@xxxxxxxxxxxxxxxxxx>
> :::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
>