diff options
Diffstat (limited to 'arch/s390/kernel/time.c')
| -rw-r--r-- | arch/s390/kernel/time.c | 50 |
1 files changed, 4 insertions, 46 deletions
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c index 4e9949800562..c95e98d49b38 100644 --- a/arch/s390/kernel/time.c +++ b/arch/s390/kernel/time.c @@ -50,10 +50,6 @@ #include <asm/cio.h> #include "entry.h" -/* change this if you have some constant time drift */ -#define USECS_PER_JIFFY ((unsigned long) 1000000/HZ) -#define CLK_TICKS_PER_JIFFY ((unsigned long) USECS_PER_JIFFY << 12) - u64 sched_clock_base_cc = -1; /* Force to data section. */ EXPORT_SYMBOL_GPL(sched_clock_base_cc); @@ -318,43 +314,6 @@ void __init time_init(void) vtime_init(); } -/* - * The time is "clock". old is what we think the time is. - * Adjust the value by a multiple of jiffies and add the delta to ntp. - * "delay" is an approximation how long the synchronization took. If - * the time correction is positive, then "delay" is subtracted from - * the time difference and only the remaining part is passed to ntp. - */ -static unsigned long long adjust_time(unsigned long long old, - unsigned long long clock, - unsigned long long delay) -{ - unsigned long long delta, ticks; - struct timex adjust; - - if (clock > old) { - /* It is later than we thought. */ - delta = ticks = clock - old; - delta = ticks = (delta < delay) ? 0 : delta - delay; - delta -= do_div(ticks, CLK_TICKS_PER_JIFFY); - adjust.offset = ticks * (1000000 / HZ); - } else { - /* It is earlier than we thought. */ - delta = ticks = old - clock; - delta -= do_div(ticks, CLK_TICKS_PER_JIFFY); - delta = -delta; - adjust.offset = -ticks * (1000000 / HZ); - } - sched_clock_base_cc += delta; - if (adjust.offset != 0) { - pr_notice("The ETR interface has adjusted the clock " - "by %li microseconds\n", adjust.offset); - adjust.modes = ADJ_OFFSET_SINGLESHOT; - do_adjtimex(&adjust); - } - return delta; -} - static DEFINE_PER_CPU(atomic_t, clock_sync_word); static DEFINE_MUTEX(clock_sync_mutex); static unsigned long clock_sync_flags; @@ -582,7 +541,7 @@ void stp_queue_work(void) static int stp_sync_clock(void *data) { static int first; - unsigned long long old_clock, delta, new_clock, clock_delta; + unsigned long long clock_delta; struct clock_sync_data *stp_sync; struct ptff_qto qto; int rc; @@ -605,18 +564,17 @@ static int stp_sync_clock(void *data) if (stp_info.todoff[0] || stp_info.todoff[1] || 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, &clock_delta); if (rc == 0) { - new_clock = old_clock + clock_delta; - delta = adjust_time(old_clock, new_clock, 0); + /* fixup the monotonic sched clock */ + sched_clock_base_cc += clock_delta; if (ptff_query(PTFF_QTO) && ptff(&qto, sizeof(qto), PTFF_QTO) == 0) /* Update LPAR offset */ lpar_offset = qto.tod_epoch_difference; atomic_notifier_call_chain(&s390_epoch_delta_notifier, 0, &clock_delta); - fixup_clock_comparator(delta); + fixup_clock_comparator(clock_delta); rc = chsc_sstpi(stp_page, &stp_info, sizeof(struct stp_sstpi)); if (rc == 0 && stp_info.tmd != 2) |
