linux-kernel - Re: AMD Geode NOPL emulation for kernel 2.6.36-rc2

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Message-ID: <20100908200715.2e56d0be@lxorguk.ukuu.org.uk>
Date:	Wed, 8 Sep 2010 20:07:15 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Nick Lowe <nick.lowe@...il.com>
Cc:	Hans-Peter Jansen <hpj@...la.net>, linux-kernel@...r.kernel.org
Subject: Re: AMD Geode NOPL emulation for kernel 2.6.36-rc2

> And nobody has answered what happens when NOPLs are used to
> synchronise with something else? Surely that can lead to subtle, hard
> to debug breakage? Isn't that plain worse than refusing to run or
> breaking out of execution?

NOPL for synchronisation - of user space. I'd say thats sufficiently
unlikely not to care. It's still an improvement on crashing.

The other point you make is a good one but it's not clear that all the
proprietary apps for example will get recompiled, so to many users its
not a solution. Similarly the long term stable distros aren't going to
recompile everything and invalidate all their test data, so I doubt that
things like Centos will.

Alan
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