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[S390] correct ktime to tod clock comparator conversion 

The conversion of the ktime to a value suitable for the clock comparator
does not take changes to wall_to_monotonic into account. In fact the
conversion just needs the boot clock (sched_clock_base_cc) and the
total_sleep_time.

This is applicable to 3.2+ kernels.

CC: stable@vger.kernel.org
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2012-02-17 10:29:23 +01:00
parent 656d912537
commit cf1eb40f8f
1 changed files with 5 additions and 2 deletions
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7
arch/s390/kernel/time.c
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@ -113,11 +113,14 @@ static void fixup_clock_comparator(unsigned long long delta)
static int s390_next_ktime(ktime_t expires,
struct clock_event_device *evt)
{
struct timespec ts;
u64 nsecs;
nsecs = ktime_to_ns(ktime_sub(expires, ktime_get_monotonic_offset()));
ts.tv_sec = ts.tv_nsec = 0;
monotonic_to_bootbased(&ts);
nsecs = ktime_to_ns(ktime_add(timespec_to_ktime(ts), expires));
do_div(nsecs, 125);
S390_lowcore.clock_comparator = TOD_UNIX_EPOCH + (nsecs << 9);
S390_lowcore.clock_comparator = sched_clock_base_cc + (nsecs << 9);
set_clock_comparator(S390_lowcore.clock_comparator);
return 0;
}