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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.
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