timekeeping: Move timekeeping helper functions

Move timekeeping helper functions to prepare for their reuse.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240325064023.2997-10-adrian.hunter@intel.com

kernel/time/timekeeping.c

@@ -381,23 +381,31 @@ static inline u64 timekeeping_delta_to_ns(const struct tk_read_base *tkr, u64 de
 	return nsec;
 }
 
-static inline u64 timekeeping_get_ns(const struct tk_read_base *tkr)
+static inline u64 timekeeping_cycles_to_ns(const struct tk_read_base *tkr, u64 cycles)
 {
 	u64 delta;
 
-	delta = timekeeping_get_delta(tkr);
+	/* calculate the delta since the last update_wall_time */
+	delta = clocksource_delta(cycles, tkr->cycle_last, tkr->mask);
 	return timekeeping_delta_to_ns(tkr, delta);
 }
 
-static inline u64 timekeeping_cycles_to_ns(const struct tk_read_base *tkr, u64 cycles)
+static __always_inline u64 fast_tk_get_delta_ns(struct tk_read_base *tkr)
 {
-	u64 delta;
+	u64 delta, cycles = tk_clock_read(tkr);
 
-	/* calculate the delta since the last update_wall_time */
 	delta = clocksource_delta(cycles, tkr->cycle_last, tkr->mask);
 	return timekeeping_delta_to_ns(tkr, delta);
 }
 
+static inline u64 timekeeping_get_ns(const struct tk_read_base *tkr)
+{
+	u64 delta;
+
+	delta = timekeeping_get_delta(tkr);
+	return timekeeping_delta_to_ns(tkr, delta);
+}
+
 /**
  * update_fast_timekeeper - Update the fast and NMI safe monotonic timekeeper.
  * @tkr: Timekeeping readout base from which we take the update
@@ -431,14 +439,6 @@ static void update_fast_timekeeper(const struct tk_read_base *tkr,
 	memcpy(base + 1, base, sizeof(*base));
 }
 
-static __always_inline u64 fast_tk_get_delta_ns(struct tk_read_base *tkr)
-{
-	u64 delta, cycles = tk_clock_read(tkr);
-
-	delta = clocksource_delta(cycles, tkr->cycle_last, tkr->mask);
-	return timekeeping_delta_to_ns(tkr, delta);
-}
-
 static __always_inline u64 __ktime_get_fast_ns(struct tk_fast *tkf)
 {
 	struct tk_read_base *tkr;