From: David Woodhouse <dwmw2@infradead.org>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org, Livio Soares <livio@eecg.toronto.edu>
Subject: Re: [PATCH] Fix performance monitor exception in 2.6.20-series
Date: Mon, 15 Jan 2007 10:40:07 +0800 [thread overview]
Message-ID: <1168828808.9415.278.camel@shinybook.infradead.org> (raw)
In-Reply-To: <1168734544.5011.78.camel@localhost.localdomain>
On Sun, 2007-01-14 at 11:29 +1100, Benjamin Herrenschmidt wrote:
>
> Well, are you absolutely sure that nothing will break as a result of
> having a PMU interrupt happening right when it's not expected to ?
>
> You are basically turning the PMU interrupt into an NMI... I'm not sure
> how safe that is.
If we can _make_ it safe, and in doing so avoid the failure mode where
the machine locks up with interrupts disabled and then the PMU resets
itself entirely (including the date), that might be a good thing...
--
dwmw2
next prev parent reply other threads:[~2007-01-15 2:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-13 15:40 [PATCH] Fix performance monitor exception in 2.6.20-series Livio Soares
2007-01-14 0:29 ` Benjamin Herrenschmidt
2007-01-14 0:39 ` Segher Boessenkool
2007-01-14 17:56 ` Livio Soares
2007-01-15 2:40 ` David Woodhouse [this message]
2007-01-15 2:53 ` Paul Mackerras
2007-01-15 3:14 ` David Woodhouse
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