netdev - Re: [PATCH v3 0/4] xfrm: add x86 CONFIG

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Date:	Thu, 08 Apr 2010 02:54:12 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	kaber@...sh.net
Cc:	fw@...len.de, netdev@...r.kernel.org, johannes@...solutions.net
Subject: Re: [PATCH v3 0/4] xfrm: add x86 CONFIG_COMPAT support

From: Patrick McHardy <kaber@...sh.net>
Date: Thu, 08 Apr 2010 11:44:43 +0200

> Either the kernel or the userspace programs have to be updated
> either way.

The only case in which we only have to change one side is if we add
the full set of compat support to the kernel.

If we take any other option (new XFRM numbers and new datastructures,
or only convert sendmsg() to do compat translations), it requires both
the kernel and userspace to change.

And the currently existing 32-bit binaries don't work on 64-bit
kernels because of something that cannot be classified any other way
than as being a kernel bug.
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