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perf_event_init() wants to start using IDR trees, its needs in turn are satisfied by mm_init(). Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20101117222056.206992649@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>