perf: Export perf_event_update_userpage
Export perf_event_update_userpage() so that PMU driver using them, can be built as modules. Acked-by: NPeter Zilstra <peterz@infradead.org> Signed-off-by: NSuzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: NWill Deacon <will.deacon@arm.com>
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