Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[firefly-linux-kernel-4.4.55.git] / arch / s390 / kernel / time.c

diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index 0a90d17132a992cca7a720f9a2ba9b58d8fb02a3..52524b9083c36aa869dfa01de51a20834f18893a 100644 (file)
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -58,6 +58,9 @@ EXPORT_SYMBOL_GPL(sched_clock_base_cc);
 
 static DEFINE_PER_CPU(struct clock_event_device, comparators);
 
+ATOMIC_NOTIFIER_HEAD(s390_epoch_delta_notifier);
+EXPORT_SYMBOL(s390_epoch_delta_notifier);
+
 /*
  * Scheduler clock - returns current time in nanosec units.
  */
@@ -746,7 +749,7 @@ static void clock_sync_cpu(struct clock_sync_data *sync)
 static int etr_sync_clock(void *data)
 {
        static int first;
-       unsigned long long clock, old_clock, delay, delta;
+       unsigned long long clock, old_clock, clock_delta, delay, delta;
        struct clock_sync_data *etr_sync;
        struct etr_aib *sync_port, *aib;
        int port;
@@ -783,6 +786,9 @@ static int etr_sync_clock(void *data)
                delay = (unsigned long long)
                        (aib->edf2.etv - sync_port->edf2.etv) << 32;
                delta = adjust_time(old_clock, clock, delay);
+               clock_delta = clock - old_clock;
+               atomic_notifier_call_chain(&s390_epoch_delta_notifier, 0,
+                                          &clock_delta);
                etr_sync->fixup_cc = delta;
                fixup_clock_comparator(delta);
                /* Verify that the clock is properly set. */
@@ -1520,7 +1526,7 @@ void stp_island_check(void)
 static int stp_sync_clock(void *data)
 {
        static int first;
-       unsigned long long old_clock, delta;
+       unsigned long long old_clock, delta, new_clock, clock_delta;
        struct clock_sync_data *stp_sync;
        int rc;
 
@@ -1545,7 +1551,11 @@ static int stp_sync_clock(void *data)
                old_clock = get_tod_clock();
                rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0);
                if (rc == 0) {
-                       delta = adjust_time(old_clock, get_tod_clock(), 0);
+                       new_clock = get_tod_clock();
+                       delta = adjust_time(old_clock, new_clock, 0);
+                       clock_delta = new_clock - old_clock;
+                       atomic_notifier_call_chain(&s390_epoch_delta_notifier,
+                                                  0, &clock_delta);
                        fixup_clock_comparator(delta);
                        rc = chsc_sstpi(stp_page, &stp_info,
                                        sizeof(struct stp_sstpi));