We have systems where the PMU interrupts are PPIs, and so per-cpu. This
patch adds support for per-cpu PMU interrupts to the perf event code.
Note that because the dev_id passed to request_percpu_irq has to be
percpu data, we now pass cpu_hw_events as the dev_id rather than armpmu.
This only place the dev_id was used was in armpmu_platform_irq, which is
fixed up accordingly.
Signed-off-by: Chris Smith
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