linux-kernel - Re: [PATCH] ACPI: idle: fix init-time TSC check regression

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Message-ID: <alpine.LFD.2.00.0905150025030.3561@localhost.localdomain>
Date:	Fri, 15 May 2009 00:27:14 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Len Brown <lenb@...nel.org>
cc:	Janne Kulmala <janne.t.kulmala@....fi>,
	Frans Pop <elendil@...net.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...e.hu>, johnstul@...ibm.com
Subject: Re: [PATCH] ACPI: idle: fix init-time TSC check regression

On Thu, 14 May 2009, Len Brown wrote:
> From: Len Brown <len.brown@...el.com>
> 
> A previous 2.6.30 patch, a71e4917dc0ebbcb5a0ecb7ca3486643c1c9a6e2,
> (ACPI: idle: mark_tsc_unstable() at init-time, not run-time)
> erroneously disabled the TSC on systems that did not actually
> have valid deep C-states.
> 
> Move the check after the deep-C-states are validated,
> via new helper, tsc_check_state(), hich replaces tsc_halts_in_c().
> 
> Signed-off-by: Len Brown <len.brown@...el.com>
> Acked-by: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
> ---
> Thomas,
> I decided to use a tsc-specific helper
> rather than piggyback on acpi_timer_check_state(),
> since that is not general, but rather LAPIC timer specific.
> (and I'll re-name that to reflect its specific function
>  in a cosmetic follow-up patch)

I have no strong opinion on that :)

> +		if (cx->valid)
> +			tsc_check_state(cx->type);
>  
>  		if (cx->valid)
>  			working++;

Could do with

      	 if (cx->valid) {
            	tsc_check_state(cx->type);
                working++;
      	 }

Otherwise Acked-by: Thomas Gleixner <tglx@...utronix.de>
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