From: Len Brown <len.brown@intel.com>
Date: Fri, 15 May 2009 05:29:31 +0000 (-0400)
Subject: ACPI: Idle C-states disabled by max_cstate should not disable the TSC
X-Git-Tag: v2.6.30-rc7~44^2^10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a0bf284bfedd6dc95bbee7ebf5ccf3b5f753a008;p=pandora-kernel.git

ACPI: Idle C-states disabled by max_cstate should not disable the TSC

Processor idle power states C2 and C3 stop the TSC on many machines.
Linux recognizes this situation and marks the TSC as unstable:

Marking TSC unstable due to TSC halts in idle

But if those same machines are booted with "processor.max_cstate=1",
then there is no need to validate C2 and C3, and no need to
disable the TSC, which can be reliably used as a clocksource.

Signed-off-by: Len Brown <len.brown@intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
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