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

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Message-ID: <20090211171622.GA13239@elte.hu>
Date:	Wed, 11 Feb 2009 18:16:22 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
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


* Steven Rostedt <rostedt@...dmis.org> wrote:

> 
> On Wed, 11 Feb 2009, Steven Rostedt wrote:
> 
> > 
> > On Wed, 11 Feb 2009, Ingo Molnar wrote:
> > 
> > > 
> > > > > Steven Rostedt (7):
> > > > >       ring-buffer: add NMI protection for spinlocks
> > > > >       nmi: add generic nmi tracking state
> > > 
> > > hm, this commit breaks a number of non-x86 architectures the following way:
> > > 
> > > In file included from /home/mingo/tip/include/linux/interrupt.h:12,
> > >                  from /home/mingo/tip/arch/ia64/include/asm/mca.h:16,
> > >                  from /home/mingo/tip/arch/ia64/kernel/asm-offsets.c:17:
> > > /home/mingo/tip/include/linux/hardirq.h:67:2: #error PREEMPT_ACTIVE too high!
> > > make[2]: *** [arch/ia64/kernel/asm-offsets.s] Error 1
> 
> 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.

	Ingo
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