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authorArnd Bergmann <arnd@arndb.de>2018-04-27 15:40:15 +0200
committerThomas Gleixner <tglx@linutronix.de>2018-05-19 13:57:32 +0200
commitb9ff604cff1135cc576cf952d394ed9401aa234b (patch)
tree2987c08c1e0deb9063d4157a9c51afd0155241de /kernel/time/timekeeping.c
parentfb7fcc96a86cfaef0f6dcc0665516aa68611e736 (diff)
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 <arnd@arndb.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Stephen Boyd <sboyd@kernel.org> Cc: y2038@lists.linaro.org Cc: John Stultz <john.stultz@linaro.org> Link: https://lkml.kernel.org/r/20180427134016.2525989-5-arnd@arndb.de
Diffstat (limited to 'kernel/time/timekeeping.c')
-rw-r--r--kernel/time/timekeeping.c19
1 files changed, 19 insertions, 0 deletions
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.