netdev - Re: [PATCH net-next v2] block/drbd: use nla_put_u64

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Message-ID: <5729EFBC.7040002@6wind.com>
Date:	Wed, 4 May 2016 14:49:00 +0200
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	philipp.reisner@...bit.com, drbd-dev@...ts.linbit.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2] block/drbd: use nla_put_u64_64bit()

Le 04/05/2016 11:05, Lars Ellenberg a écrit :
[snip]
> We don't have an "alignment problem" there, btw.
> Last time I checked, we did work fine without this alignment magic,
> we already take care of that, yes, even on affected architectures.
The code adds several consecutive u64 attributes. The nl attribute header is 4
bytes, thus the full attribute length is 12 bytes. If the first u64 is aligned
on 8 (nla_data()), the next one is not aligned on 8: it starts 12 bytes (8 (u64)
+ 4 (nl attr hdr)) after the previous u64.