x86, tsc: Fix a preemption leak in restore_sched_clock_state()
A real life genuine preemption leak.. Reported-and-tested-by: NJeff Chua <jeff.chua.linux@gmail.com> Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: NSuresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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