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Date: Wed, 11 Feb 2009 18:31:31 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Steven Rostedt <rostedt@goodmis.org>, Tony Luck <tony.luck@intel.com>,
       Mike Travis <travis@sgi.com>
Cc: linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
       Peter Zijlstra <peterz@infradead.org>,
       Arnaldo Carvalho de Melo <acme@redhat.com>,
       Frederic Weisbecker <fweisbec@gmail.com>
Subject: Re: [PATCH 0/8] git pull request for tip/tracing/core
Message-ID: <20090211173131.GA27546@elte.hu>
References: <20090208054955.777429253@goodmis.org> <20090209093751.GD7930@elte.hu> <20090211153650.GA19576@elte.hu> <alpine.DEB.1.10.0902111147450.15438@gandalf.stny.rr.com> <alpine.DEB.1.10.0902111158380.15438@gandalf.stny.rr.com> <20090211171622.GA13239@elte.hu> <alpine.DEB.1.10.0902111227570.15438@gandalf.stny.rr.com>
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* Steven Rostedt <rostedt@goodmis.org> wrote:

> 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.

i'm the wrong person to be asked about that. (Cc:-ed the right people)

	Ingo