x86, perf: Change two init functions to static

init_hw_perf_events() is called via early_initcall now.
x86_pmu_event_init is x86_pmu member function.

So we can change them to static.
Signed-off-by: NYinghai Lu <yinghai@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
LKML-Reference: <4D3A16F9.109@kernel.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/cpu/perf_event.c

@@ -1389,7 +1389,7 @@ static void __init pmu_check_apic(void)
 	pr_info("no hardware sampling interrupt available.\n");
 }
 
-int __init init_hw_perf_events(void)
+static int __init init_hw_perf_events(void)
 {
 	struct event_constraint *c;
 	int err;
@@ -1608,7 +1608,7 @@ static int validate_group(struct perf_event *event)
 	return ret;
 }
 
-int x86_pmu_event_init(struct perf_event *event)
+static int x86_pmu_event_init(struct perf_event *event)
 {
 	struct pmu *tmp;
 	int err;