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

Ping-Ke Shih
2026-04-10T12:14:49Z

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