[PATCH] x86-64: - Ignore long SMI interrupts in clock calibration code - update 1

Add failsafe mechanism to HPET/TSC clock calibration.

Signed-off-by: Jack Steiner <steiner@sgi.com>

Updated to include failsafe mechanism & additional community feedback.
Patch built on latest 2.6.20-rc4-mm1 tree.

Signed-off-by: Andi Kleen <ak@suse.de>