1 files changed, 10 insertions, 1 deletions

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index a6d85c0a7f20..70f4b9604575 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -468,6 +468,11 @@ int __cpuinit start_secondary(void *cpuvoid)
         ipi_call_lock();
         set_cpu_online(smp_processor_id(), true);
         ipi_call_unlock();
+        __ctl_clear_bit(0, 28); /* Disable lowcore protection */
+        S390_lowcore.restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
+        S390_lowcore.restart_psw.addr =
+                PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
+        __ctl_set_bit(0, 28); /* Enable lowcore protection */
         /* Switch on interrupts */
         local_irq_enable();
         /* cpu_idle will call schedule for us */
@@ -507,7 +512,11 @@ static int __cpuinit smp_alloc_lowcore(int cpu)
         memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512);
         lowcore->async_stack = async_stack + ASYNC_SIZE;
         lowcore->panic_stack = panic_stack + PAGE_SIZE;
-
+        lowcore->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
+        lowcore->restart_psw.addr =
+                PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
+        if (user_mode != HOME_SPACE_MODE)
+                lowcore->restart_psw.mask |= PSW_ASC_HOME;
 #ifndef CONFIG_64BIT
         if (MACHINE_HAS_IEEE) {
                 unsigned long save_area;