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This patch add an optional callback needed by some PMU features, e.g., AMD BRS, to give a chance to the perf_events code to change its state before going to low power and after coming back. The callback is void when the PERF_NEEDS_LOPWR_CB flag is not set. This flag must be set in arch specific perf_event.h header whenever needed. When not set, there is no impact of the ACPI code. Signed-off-by: Stephane Eranian <eranian@google.com>
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