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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2016-05-31 10:09:57 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-06-13 16:58:19 +0300
commit2f82f57763d97700788cf228de1cf30ffd4153b4 (patch)
tree39cacadec4bc9203b539c60f815f4c2f77b92a1b /arch/s390/kernel/time.c
parent4e042af463f806b6ef0e44048eba0964f0a5694e (diff)
downloadlinux-2f82f57763d97700788cf228de1cf30ffd4153b4.tar.xz
s390/time: STP sync clock correction
The sync clock operation of the channel subsystem call for STP delivers the TOD clock difference as a result. Use this TOD clock difference instead of the difference between the TOD timestamps before and after the sync clock operation. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/time.c')
-rw-r--r--arch/s390/kernel/time.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index 9409d32f285e..a725fd1c4315 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -1455,7 +1455,7 @@ static void __init stp_reset(void)
int rc;
stp_page = (void *) get_zeroed_page(GFP_ATOMIC);
- rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
+ rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000, NULL);
if (rc == 0)
set_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags);
else if (stp_online) {
@@ -1554,11 +1554,10 @@ static int stp_sync_clock(void *data)
stp_info.todoff[2] || stp_info.todoff[3] ||
stp_info.tmd != 2) {
old_clock = get_tod_clock();
- rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0);
+ rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0, &clock_delta);
if (rc == 0) {
- new_clock = get_tod_clock();
+ new_clock = old_clock + clock_delta;
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);
@@ -1590,12 +1589,12 @@ static void stp_work_fn(struct work_struct *work)
mutex_lock(&stp_work_mutex);
if (!stp_online) {
- chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
+ chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000, NULL);
del_timer_sync(&stp_timer);
goto out_unlock;
}
- rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0);
+ rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0, NULL);
if (rc)
goto out_unlock;