linux-kernel - Re: [patch] clockevents: drivers for i386, fix #2

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Message-ID: <20061004163527.GA2328@elte.hu>
Date:	Wed, 4 Oct 2006 18:35:27 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...l.org>
Cc:	tglx@...utronix.de, LKML <linux-kernel@...r.kernel.org>,
	Jim Gettys <jg@...top.org>, John Stultz <johnstul@...ibm.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: [patch] clockevents: drivers for i386, fix #2


* Andrew Morton <akpm@...l.org> wrote:

> >  	.name = "lapic",
> >  	.capabilities = CLOCK_CAP_NEXTEVT | CLOCK_CAP_PROFILE
> > +#ifdef CONFIG_SMP
> >  			| CLOCK_CAP_UPDATE,
> > +#endif
> >  	.shift = 32,
> >  	.set_mode = lapic_timer_setup,
> >  	.set_next_event = lapic_next_event,
> 
> that (after a tweak to make it compile) fixes it. [...]

cool!

the vanilla SMP kernel will likely show similar effects on your laptop. 
We'll figure out a safe way to detect this quirk, and to work it around 
or turn off the lapic timer driver in that case.

(Btw., this bug was cleanups collateral damage. Many people are running 
-rt on laptops and i think we'd have noticed.)

	Ingo
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