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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-02-17 13:29:23 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-02-17 13:29:33 +0400 |
| commit | cf1eb40f8f5ea12c9e569e7282161fc7f194fd62 (patch) | |
| tree | 768a78bd496b7a385bd2b05d5dde4563c84728cd | |
| parent | 656d9125376006cf696b0836f1c6723a892629ca (diff) | |
| download | linux-cf1eb40f8f5ea12c9e569e7282161fc7f194fd62.tar.xz | |
[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>
| -rw-r--r-- | arch/s390/kernel/time.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c index fa02f443f5f6..14da278febbf 100644 --- a/arch/s390/kernel/time.c +++ b/arch/s390/kernel/time.c @@ -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; } |