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To: "David S. Miller" <davem@redhat.com>
cc: axboe@suse.de, linux-kernel@vger.kernel.org
Subject: Re: block layer sg, bsg
References: <2ppN4-1wi-11@gated-at.bofh.it> <2pvps-5xO-33@gated-at.bofh.it>
	<2pvz2-5Lf-19@gated-at.bofh.it> <2pwbQ-68b-43@gated-at.bofh.it>
From: Andi Kleen <ak@muc.de>
Date: Wed, 04 Aug 2004 19:28:04 +0200
In-Reply-To: <2pwbQ-68b-43@gated-at.bofh.it> (David S. Miller's message of
 "Wed, 04 Aug 2004 17:50:14 +0200")
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"David S. Miller" <davem@redhat.com> writes:
>
> Or use a more portable well-defined type which does not change
> size nor layout between 32-bit and 64-bit environments.

That is usually a mistake. People get the more subtle issues
like long long handling wrong, and then it is impossible to fix it 
anymore in a compat layer (examples are ipsec and iptables, which
cannot be emulated on x86-64 because of that) 

So please never pass any structures with read/write/netlink.

Thank you.

-Andi