[natty/maverick] [PATCH] SRU: sched, x86: Avoid unnecessary overflow in sched_clock

[Chris J Arges]

SRU Justification:

BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/805341

Impact: Machines with uptimes of 200+ days will sometimes have soft lockups.

Fix: This was fixed in upstream. It has already been backported to Lucid.

Testcase: Run your computer for 200+ days and verify it doesn't lockup.
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