ARM: 8071/1: perf: Make perf use arm_get_current_stackframe

Make the perf backend use the API so that it correctly references the FP
when in THUMB2 mode

Signed-off-by: Nikolay Borisov <Nikolay.Borisov@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/kernel/perf_event.c

@@ -621,10 +621,7 @@ perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
 		return;
 	}
 
-	fr.fp = regs->ARM_fp;
-	fr.sp = regs->ARM_sp;
-	fr.lr = regs->ARM_lr;
-	fr.pc = regs->ARM_pc;
+	arm_get_current_stackframe(regs, &fr);
 	walk_stackframe(&fr, callchain_trace, entry);
 }