From b9ff604cff1135cc576cf952d394ed9401aa234b Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Fri, 27 Apr 2018 15:40:15 +0200 Subject: timekeeping: Add ktime_get_coarse_with_offset I have run into a couple of drivers using current_kernel_time() suffering from the y2038 problem, and they could be converted to using ktime_t, but don't have interfaces that skip the nanosecond calculation at the moment. This introduces ktime_get_coarse_with_offset() as a simpler variant of ktime_get_with_offset(), and adds wrappers for the three time domains we support with the existing function. Signed-off-by: Arnd Bergmann Signed-off-by: Thomas Gleixner Cc: Stephen Boyd Cc: y2038@lists.linaro.org Cc: John Stultz Link: https://lkml.kernel.org/r/20180427134016.2525989-5-arnd@arndb.de --- kernel/time/timekeeping.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'kernel/time') diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index ed9b74ec9c0b..4786df904c22 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -795,6 +795,25 @@ ktime_t ktime_get_with_offset(enum tk_offsets offs) } EXPORT_SYMBOL_GPL(ktime_get_with_offset); +ktime_t ktime_get_coarse_with_offset(enum tk_offsets offs) +{ + struct timekeeper *tk = &tk_core.timekeeper; + unsigned int seq; + ktime_t base, *offset = offsets[offs]; + + WARN_ON(timekeeping_suspended); + + do { + seq = read_seqcount_begin(&tk_core.seq); + base = ktime_add(tk->tkr_mono.base, *offset); + + } while (read_seqcount_retry(&tk_core.seq, seq)); + + return base; + +} +EXPORT_SYMBOL_GPL(ktime_get_coarse_with_offset); + /** * ktime_mono_to_any() - convert mononotic time to any other time * @tmono: time to convert. -- cgit v1.2.3