This has been tested on i386, sunxi and mxs.
Signed-off-by: Harald Geyer <harald@xxxxxxxxx>
---
include/linux/timekeeping.h | 1 +
kernel/time/timekeeping.c | 18 ++++++++++++++++++
2 files changed, 19 insertions(+), 0 deletions(-)
diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h
index 3eaae47..983b61e 100644
--- a/include/linux/timekeeping.h
+++ b/include/linux/timekeeping.h
@@ -163,6 +163,7 @@ extern ktime_t ktime_get(void);
extern ktime_t ktime_get_with_offset(enum tk_offsets offs);
extern ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs);
extern ktime_t ktime_get_raw(void);
+extern u32 ktime_get_resolution_ns(void);
/**
* ktime_get_real - get the real (wall-) time in ktime_t format
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 91db941..b823eba 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -586,6 +586,24 @@ ktime_t ktime_get(void)
}
EXPORT_SYMBOL_GPL(ktime_get);
+u32 ktime_get_resolution_ns(void)
+{
+ struct timekeeper *tk = &tk_core.timekeeper;
+ unsigned int seq;
+ u32 nsecs;
+
+ WARN_ON(timekeeping_suspended);
+
+ do {
+ seq = read_seqcount_begin(&tk_core.seq);
+ nsecs = tk->tkr.mult >> tk->tkr.shift;
+ } while (read_seqcount_retry(&tk_core.seq, seq));
+
+ return nsecs;
+}
+
+EXPORT_SYMBOL_GPL(ktime_get_resolution_ns);
+
static ktime_t *offsets[TK_OFFS_MAX] = {
[TK_OFFS_REAL] = &tk_core.timekeeper.offs_real,
[TK_OFFS_BOOT] = &tk_core.timekeeper.offs_boot,
--
1.7.2.5
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