Re: [PATCH net-next v2] block/drbd: use nla_put_u64_64bit()

From: Nicolas Dichtel
Date: Wed May 04 2016 - 08:49:10 EST

Le 04/05/2016 11:05, Lars Ellenberg a écrit :
> 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.