linux-kernel - Re: [kbuild-all] Re: include/linux/compiler_types.h:315:38: error: call to '__compiletime_assert_536' declared with attribute error: BUILD_BUG_ON failed: offsetof(struct can_frame, len) != offsetof(struct canfd_frame, len) || offsetof(struct can

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Date:   Wed, 24 Mar 2021 10:57:25 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Oliver Hartkopp <socketcan@...tkopp.net>
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Rong Chen <rong.a.chen@...el.com>,
        Patrick Menschel <menschel.p@...teo.de>,
        kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org, linux-can <linux-can@...r.kernel.org>
Subject: Re: [kbuild-all] Re: include/linux/compiler_types.h:315:38: error:
 call to '__compiletime_assert_536' declared with attribute error:
 BUILD_BUG_ON failed: offsetof(struct can_frame, len) != offsetof(struct
 canfd_frame, len) || offsetof(struct can_frame, data) != offsetof(struc...

On 24.03.2021 10:09:22, Oliver Hartkopp wrote:
> @Marc: Looks like we can not get around the __packed() fix :-(
> 
> At least we now have some more documentation to be referenced and I would
> suggest to point out that some compilers handle the union alignment like
> this.

It's not the compiler, but the ABI.

> To make clear in the comments what we are suppressing here any why.

Feel free to post an updated patch description.

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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