linux-kernel - Re: x86, vmi: TSC going backwards check in vmi clocksource

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Message-ID: <20090220183130.GA14849@elte.hu>
Date:	Fri, 20 Feb 2009 19:31:30 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Alok Kataria <akataria@...are.com>
Cc:	the arch/x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Zach Amsden <zach@...are.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: x86, vmi: TSC going backwards check in vmi clocksource


* Alok Kataria <akataria@...are.com> wrote:

> On Fri, 2009-02-20 at 09:58 -0800, Ingo Molnar wrote:
> > * Alok Kataria <akataria@...are.com> wrote:
> > 
> > >  static cycle_t read_real_cycles(void)
> > >  {
> > > -	return vmi_timer_ops.get_cycle_counter(VMI_CYCLES_REAL);
> > > +	cycle_t ret = (cycle_t)vmi_timer_ops.get_cycle_counter(VMI_CYCLES_REAL);
> > > +	return ret >= clocksource_vmi.cycle_last ?
> > > +		ret : clocksource_vmi.cycle_last;
> > 
> > btw., could you please clean this up to use max()?
> 
> Please find it below, on top of current tip/master.

Applied to tip:x86/cleanups, thanks!

	Ingo
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