x86/perf/intel/rapl: Make the Intel RAPL PMU driver modular
By default, the RAPL driver will be built into the kernel. If it is configured as a module, the supported CPU model can be auto loaded. Also clean up the code of rapl_pmu_init(). Based-on-a-patch-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Kan Liang <kan.liang@intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Vince Weaver <vincent.weaver@maine.edu> Link: http://lkml.kernel.org/r/1458372050-2420-2-git-send-email-kan.liang@intel.comSigned-off-by: Ingo Molnar <mingo@kernel.org>
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