linux-kernel - Re: + i386-lapic-timer-calibration.patch added to -mm tree

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Message-ID: <20061108122826.GA23268@elte.hu>
Date:	Wed, 8 Nov 2006 13:28:26 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org, mm-commits@...r.kernel.org,
	Andrew Morton <akpm@...l.org>
Subject: Re: + i386-lapic-timer-calibration.patch added to -mm tree


* Thomas Gleixner <tglx@...utronix.de> wrote:

> On Wed, 2006-11-08 at 13:09 +0100, Ingo Molnar wrote:
> > one question:
> > 
> > > +	long tapic = apic_read(APIC_TMCCT);
> > > +	unsigned long pm = acpi_pm_read_early();
> > 
> > is this function call safe if the box has no pm-timer?
> 
> That's in the pm-timer-allow-early-access.patch:
> 
> Subject: pmtimer: Allow early access to pm timer
> 
> +static inline u32 acpi_pm_read_early(void)
> +{
> +       if (!pmtmr_ioport)
> +               return 0;
> +       /* mask the output to 24 bits */
> +       return acpi_pm_read_verified();
> +}
> 
> If pmtmr is not available, the function returns 0, so the resulting 
> delta is 0 and therefor ignored. Same applies, when PMTIMER is 
> disabled in the config.

ok, looks good.

	Ingo
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