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Subject: Re: problem with cache flush routine for G5?
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Chris Friesen <cfriesen@nortelnetworks.com>
Cc: Linux Kernel list <linux-kernel@vger.kernel.org>,
       Tom Rini <trini@kernel.crashing.org>
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> Assuming that I really did want to flush the whole cache, how would I go 
> about doing that from userspace? 

I don't think you can do it reliably, but again, that do not make
sense, so please check with those folks what's exactly going on.