We should not be calling calc_timer_values() for events that do not actually
have an mmap()'ed userpage.
Signed-off-by: NPeter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20130802191630.GT27162@twins.programming.kicks-ass.netSigned-off-by: NIngo Molnar <mingo@kernel.org>