linux-kernel - Re: [PATCH 0/8] git pull request for tip/tracing/core

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Message-ID: <alpine.DEB.1.10.0902111227570.15438@gandalf.stny.rr.com>
Date:	Wed, 11 Feb 2009 12:30:00 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 0/8] git pull request for tip/tracing/core


On Wed, 11 Feb 2009, Ingo Molnar wrote:
> > 
> > I just looked at alpha and arm, I'm now looking at ia64. And this could
> > be an issue, since it has 14 bits for hard irqs.
> > 
> > What would be the impact to make the preempt count a long?
> 
> Assembly code has to be audited i guess, whether it's treated as an int anywhere. 
> Should work i guess.

Before we go and make the change, Peter brought up a good point on IRC. Is 
there any reason that ia64 needs 1 << 14 IRQs?  That's 16384!

Perhaps the better solution wolud be (if possible), to simply lower the 
number of bits.

-- Steve

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