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From: Segher Boessenkool <segher@kernel.crashing.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: Sun, 14 Jan 2007 01:39:17 +0100	[thread overview]
Message-ID: <dd188efa1bcb288b11f0b7c601c8778a@kernel.crashing.org> (raw)
In-Reply-To: <1168734544.5011.78.camel@localhost.localdomain>

> 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.

That just depends what code is run from the PMU exception.
It very much makes sense *conceptually* to have it behave
like an NMI I think -- but yeah the code run from the
exception had better behave ;-)


Segher

  reply	other threads:[~2007-01-14  0:38 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 [this message]
2007-01-14 17:56   ` Livio Soares
2007-01-15  2:40   ` David Woodhouse
2007-01-15  2:53     ` Paul Mackerras
2007-01-15  3:14       ` David Woodhouse

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