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

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Date:	Fri, 15 May 2009 12:57:43 +0200
From:	Frans Pop <elendil@...net.nl>
To:	Len Brown <lenb@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Janne Kulmala <janne.t.kulmala@....fi>,
	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 Thursday 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>

OK on both my desktop (which had the regression) and laptop.

Tested-by: Frans Pop <elendil@...net.nl>

(Tested together with the 2 patches you sent later.)

Cheers,
FJP
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