patch to catch non-working hpet

[Nate Lawson]

Rui Paulo wrote:
> Nate Lawson wrote:
>> I need someone to test this code.  You have to have an HPET timer.  It
>> should detect the case where it's non-working on at least one Acer
>> system but not break others.  Your system should boot and work normally
>> with no change in dmesg.  Let me know if it breaks something, thx.
> 
> Works fine.
> acpi_hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on
> acpi0
> Timecounter "HPET" frequency 14318180 Hz quality 2000
> 
> No changes in dmesg.

Thanks.  Now if it fixes silby's problem, I'll commit it.

-Nate