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

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Date:	Wed, 04 May 2016 12:47:12 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	nicolas.dichtel@...nd.com
Cc:	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()

From: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Date: Wed, 4 May 2016 14:49:00 +0200

> 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.

Right.