linux-kernel - Re: drivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h:1174:29: error: enumerator value for 'i40e_static_assert_i40e_aqc_cloud_filters_element

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Date:   Wed, 15 Jun 2022 16:11:17 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     kernel test robot <lkp@...el.com>
Cc:     Arnd Bergmann <arnd@...db.de>, kbuild-all@...ts.01.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Intel Wired LAN <intel-wired-lan@...ts.osuosl.org>
Subject: Re: drivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h:1174:29: error:
 enumerator value for 'i40e_static_assert_i40e_aqc_cloud_filters_element_data'
 is not an integer constant

On Thu, Jun 9, 2022 at 12:25 PM kernel test robot <lkp@...el.com> wrote:
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   6bfb56e93bcef41859c2d5ab234ffd80b691be35
> commit: 250c1a694ff304e5d69e74ab32755eddcc2b8f65 ARM: pxa: convert to multiplatform

This is not really related to my commit but it does disappear before
this one when bisecting.

>    In file included from drivers/net/ethernet/intel/i40e/i40e_adminq.h:9,
>                     from drivers/net/ethernet/intel/i40e/i40e_type.h:10,
>                     from drivers/net/ethernet/intel/i40e/i40e.h:40,
>                     from drivers/net/ethernet/intel/i40e/i40e_main.c:12:
> >> drivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h:301:39: warning: division by zero [-Wdiv-by-zero]
>      301 |         { i40e_static_assert_##X = (n)/((sizeof(struct X) == (n)) ? 1 : 0) }
>          |                                       ^
>    drivers/net/ethernet/intel/i40e/i40e_adminq_cmd.h:1174:1: note: in expansion of macro 'I40E_CHECK_STRUCT_LEN'
>     1174 | I40E_CHECK_STRUCT_LEN(0x40, i40e_aqc_cloud_filters_element_data);
>          | ^~~~~~~~~~~~~~~~~~~~~

The bug is that 'i40e_aqc_cloud_filters_element_data' and some other
structures in the
same file are broken when building an ARM kernel without CONFIG_AEABI, which has
unusual struct packing rules and triggers the static assertion.

It's clearly a bug, but nobody is going to run this driver on an OABI
kernel, so I think
the options are:

- add "__packed __aligned(4)" to each of these structure definitions
- make the driver depend on !(ARM && AEABI) in Kconfig
- ask lkp to stop testing CONFIG_AEABI=n kernels in randconfig builds
  and ignore the problem along with others like it

         Arnd