linux-kernel - Re: [-next] openvswitch BUILD_BUG

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Message-ID: <CAEP_g=-XvRiHPzSAp2rgC9Hxdd+pGEHvSTEJ1A1SkWnk1-6xZA@mail.gmail.com>
Date:	Thu, 29 Aug 2013 14:42:22 -0700
From:	Jesse Gross <jesse@...ira.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Andy Zhou <azhou@...ira.com>,
	"dev@...nvswitch.org" <dev@...nvswitch.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-Next <linux-next@...r.kernel.org>
Subject: Re: [-next] openvswitch BUILD_BUG_ON failed

On Thu, Aug 29, 2013 at 2:21 PM, Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
> However, I have some doubts about other alignment "enforcements":
>
> "__aligned(__alignof__(long))" makes the whole struct aligned to the
> alignment rule for "long":
>    1. This is only 2 bytes on m68k, i.e. != sizeof(long).
>    2. This is 4 bytes on many 32-bit platforms, which may be less than the
>       default alignment for "__be64" (cfr. some members of struct
>       ovs_key_ipv4_tunnel), so this may make those 64-bit members unaligned.

Do any of those 32-bit architectures actually care about alignment of
64 bit values? On 32-bit x86, a long is 32 bits but the alignment
requirement of __be64 is also 32 bit.
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