From: ydroneaud@opteya.com (Yann Droneaud)
To: kernelnewbies@lists.kernelnewbies.org
Subject: struct nbd_reply not packed => trouble?
Date: Tue, 15 Jan 2013 10:59:05 +0100 [thread overview]
Message-ID: <1358243945.3741.5.camel@dworkin.quest-ce.net> (raw)
In-Reply-To: <BLU402-EAS225E36389A451EE865494DCBC2D0@phx.gbl>
Hi,
Le mardi 15 janvier 2013 ? 07:59 +0800, ??? a ?crit :
>
> ? 2013-1-11?0:42?"Yann Droneaud" <ydroneaud@opteya.com> ???
> >> - Any ideas for a platform where you would expect struct nbd_reply to
> >> be other than 4 + 4 + 8 = 16 bytes in size?
> >
> > Look for an ABI that require 'char' with either property:
> > - size > 1 byte
> > - alignment > 8 (16 bytes !)
> >
> >
>
> Do you mean this structure size will vary on different platform? If yes, why Linux does not packed here? Thanks
>
There's probably no such architecture for a general purpose processor
with the ABI properties I've mentionned. eg. (sizeof(char) > 1 ||
alignof(char) > 8).
And if one day Linux is going to be ported on such target, the packing
of the nbd_reply struct will be the smallest problem to fix.
Regards
--
Yann Droneaud
OPTEYA
prev parent reply other threads:[~2013-01-15 9:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-10 16:09 struct nbd_reply not packed => trouble? Sebastian Pipping
2013-01-10 16:36 ` Yann Droneaud
2013-01-13 16:45 ` Sebastian Pipping
2013-01-14 23:59 ` 卜弋天
2013-01-15 9:59 ` Yann Droneaud [this message]
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