1 files changed, 19 insertions, 0 deletions

diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 4d221c81c849..cf09948faad6 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -34,8 +34,25 @@
 
 char kernel_nss_name[NSS_NAME_SIZE + 1];
 
+static unsigned long machine_flags;
+
 static void __init setup_boot_command_line(void);
 
+/*
+ * Get the TOD clock running.
+ */
+static void __init reset_tod_clock(void)
+{
+        u64 time;
+
+        if (store_clock(&time) == 0)
+                return;
+        /* TOD clock not running. Set the clock to Unix Epoch. */
+        if (set_clock(TOD_UNIX_EPOCH) != 0 || store_clock(&time) != 0)
+                disabled_wait(0);
+
+        sched_clock_base_cc = TOD_UNIX_EPOCH;
+}
 
 #ifdef CONFIG_SHARED_KERNEL
 int __init savesys_ipl_nss(char *cmd, const int cmdlen);
@@ -370,6 +387,7 @@ static void __init setup_boot_command_line(void)
  */
 void __init startup_init(void)
 {
+        reset_tod_clock();
         ipl_save_parameters();
         rescue_initrd();
         clear_bss_section();
@@ -391,5 +409,6 @@ void __init startup_init(void)
         setup_hpage();
         sclp_facilities_detect();
         detect_memory_layout(memory_chunk);
+        S390_lowcore.machine_flags = machine_flags;
         lockdep_on();
 }