[S390] ftrace: add dynamic ftrace support

Dynamic ftrace support for s390.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 0af302c..cc8c484 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -572,6 +572,7 @@
 	cpu_lowcore->cpu_nr = cpu;
 	cpu_lowcore->kernel_asce = S390_lowcore.kernel_asce;
 	cpu_lowcore->machine_flags = S390_lowcore.machine_flags;
+	cpu_lowcore->ftrace_func = S390_lowcore.ftrace_func;
 	eieio();
 
 	while (signal_processor(cpu, sigp_restart) == sigp_busy)