From 9a6b51976ea3a326b6de534beec3fd87275f4ef6 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 16 Jul 2014 21:04:22 +0000 Subject: timekeeping: Provide ktime_mono_to_any() ktime based conversion function to map a monotonic time stamp to a different CLOCK. Signed-off-by: Thomas Gleixner Signed-off-by: John Stultz --- kernel/time/timekeeping.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'kernel/time') diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index e99350319eec..032e77a54a79 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -450,6 +450,26 @@ ktime_t ktime_get_with_offset(enum tk_offsets offs) } EXPORT_SYMBOL_GPL(ktime_get_with_offset); +/** + * ktime_mono_to_any() - convert mononotic time to any other time + * @tmono: time to convert. + * @offs: which offset to use + */ +ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs) +{ + ktime_t *offset = offsets[offs]; + unsigned long seq; + ktime_t tconv; + + do { + seq = read_seqcount_begin(&tk_core.seq); + tconv = ktime_add(tmono, *offset); + } while (read_seqcount_retry(&tk_core.seq, seq)); + + return tconv; +} +EXPORT_SYMBOL_GPL(ktime_mono_to_any); + /** * ktime_get_ts64 - get the monotonic clock in timespec64 format * @ts: pointer to timespec variable -- cgit