[S390] ftrace: dont trace machine check handler

The ftrace code is currently not reentrant, so we better don't trace
our machine check handler. Machine checks are handled like NMIs on s390.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/s390/s390mach.c b/drivers/s390/s390mach.c
index 92b0417f8e12..8e437052e076 100644
--- a/drivers/s390/s390mach.c
+++ b/drivers/s390/s390mach.c
@@ -357,8 +357,7 @@ s390_revalidate_registers(struct mci *mci)
 /*
  * machine check handler.
  */
-void
-s390_do_machine_check(struct pt_regs *regs)
+void notrace s390_do_machine_check(struct pt_regs *regs)
 {
         static DEFINE_SPINLOCK(ipd_lock);
         static unsigned long long last_ipd;