linux-kernel - Re: [PATCH] x86 apic: Ack all pending irqs when crashed/on kexec

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Date:	Mon, 8 Mar 2010 12:40:03 +0100
From:	Thomas Renninger <trenn@...e.de>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Kerstin Jonsson <kerstin.jonsson@...csson.com>,
	jbohac@...ell.com, Yinghai Lu <yinghai@...nel.org>,
	akpm@...ux-foundation.org, mingo@...e.hu,
	Avi Kivity <avi@...hat.com>
Subject: Re: [PATCH] x86 apic: Ack all pending irqs when crashed/on kexec

On Monday 08 March 2010 12:34:52 Cyrill Gorcunov wrote:
> On Mon, Mar 08, 2010 at 12:17:10PM +0100, Thomas Renninger wrote:
> ...
> > diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
> > index 3987e44..93cdb2a 100644
> > +	if (cpu_has_tsc)
> > +		rdtscll(ntsc);
> 
> Perhaps rdtscll(tsc)?
Oh dear..., I played with this to wipe out:
warning: ‘tsc’ may be used uninitialized in this function

> > +	    if (cpu_has_tsc) {
> > +		    rdtscll(ntsc);
> > +		    max_loops = (cpu_khz << 10) - (ntsc - tsc);
> 
> Where is tsc modified? It remains tsc = 0 all the time?
> Or I miss the snippet where it is set?
Yes, you are right..., next version, thanks a lot for looking at this,

    Thomas
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