perf: export perf_trace_regs and perf_arch_fetch_caller_regs

Export perf_trace_regs and perf_arch_fetch_caller_regs since module will
use these.

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
[ use EXPORT_PER_CPU_SYMBOL_GPL() ]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <4B989C1B.2090407@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/cpu/perf_event.c

@@ -1713,3 +1713,4 @@ void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip, int ski
 	regs->cs = __KERNEL_CS;
 	local_save_flags(regs->flags);
 }
+EXPORT_SYMBOL_GPL(perf_arch_fetch_caller_regs);

kernel/trace/trace_event_perf.c

@@ -10,6 +10,7 @@
 #include "trace.h"
 
 DEFINE_PER_CPU(struct pt_regs, perf_trace_regs);
+EXPORT_PER_CPU_SYMBOL_GPL(perf_trace_regs);
 
 static char *perf_trace_buf;
 static char *perf_trace_buf_nmi;