[PATCH] fix TSC clocksource bug

[Dan Hecht]

Please apply this commit from 
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git to 
the Ubuntu Hardy kernel tree:

commit 47001d603375f857a7fab0e9c095d964a1ea0039
Author: Thomas Gleixner <tglx at linutronix.de>
Date:   Tue Apr 1 19:45:18 2008 +0200

     x86: tsc prevent time going backwards


The bug fixed by this patch has existed since the introduction of 
clocksource into x86 kernels, and can cause timeofday to jump forward 
along with kernel hangs.  The problems can be seen on native hardware, 
but can probably occur a bit more frequent when running on a virtual 
machine.

I've attached the same patch with the same change as above but rebased 
to the Hardy 2.6.24 tree.

thanks,
Dan
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