timekeeping: Standardize on ktime_get_*() naming

The current_kernel_time64, get_monotonic_coarse64, getrawmonotonic64,
get_monotonic_boottime64 and timekeeping_clocktai64 interfaces have
rather inconsistent naming, and they differ in the calling conventions
by passing the output either by reference or as a return value.

Rename them to ktime_get_coarse_real_ts64, ktime_get_coarse_ts64,
ktime_get_raw_ts64, ktime_get_boottime_ts64 and ktime_get_clocktai_ts64
respectively, and provide the interfaces with macros or inline
functions as needed.

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/20180427134016.2525989-4-arnd@arndb.de

include/linux/timekeeping.h

@@ -19,25 +19,25 @@ extern void xtime_update(unsigned long ticks);
 extern int do_settimeofday64(const struct timespec64 *ts);
 extern int do_sys_settimeofday64(const struct timespec64 *tv,
 				 const struct timezone *tz);
-/*
- * Kernel time accessors
- */
-struct timespec64 current_kernel_time64(void);
 
 /*
  * timespec64 based interfaces
  */
-struct timespec64 get_monotonic_coarse64(void);
-extern void getrawmonotonic64(struct timespec64 *ts);
+extern void ktime_get_raw_ts64(struct timespec64 *ts);
 extern void ktime_get_ts64(struct timespec64 *ts);
 extern void ktime_get_real_ts64(struct timespec64 *tv);
+extern void ktime_get_coarse_ts64(struct timespec64 *ts);
+extern void ktime_get_coarse_real_ts64(struct timespec64 *ts);
+
+void getboottime64(struct timespec64 *ts);
+
+/*
+ * time64_t base interfaces
+ */
 extern time64_t ktime_get_seconds(void);
 extern time64_t __ktime_get_real_seconds(void);
 extern time64_t ktime_get_real_seconds(void);
 
-extern void getboottime64(struct timespec64 *ts);
-
-
 /*
  * ktime_t based interfaces
  */
@@ -123,12 +123,12 @@ extern u64 ktime_get_real_fast_ns(void);
 /*
  * timespec64 interfaces utilizing the ktime based ones
  */
-static inline void get_monotonic_boottime64(struct timespec64 *ts)
+static inline void ktime_get_boottime_ts64(struct timespec64 *ts)
 {
 	*ts = ktime_to_timespec64(ktime_get_boottime());
 }
 
-static inline void timekeeping_clocktai64(struct timespec64 *ts)
+static inline void ktime_get_clocktai_ts64(struct timespec64 *ts)
 {
 	*ts = ktime_to_timespec64(ktime_get_clocktai());
 }
@@ -212,5 +212,26 @@ extern int update_persistent_clock64(struct timespec64 now);
  * deprecated aliases, don't use in new code
  */
 #define getnstimeofday64(ts)		ktime_get_real_ts64(ts)
+#define get_monotonic_boottime64(ts)	ktime_get_boottime_ts64(ts)
+#define getrawmonotonic64(ts)		ktime_get_raw_ts64(ts)
+#define timekeeping_clocktai64(ts)	ktime_get_clocktai_ts64(ts)
+
+static inline struct timespec64 current_kernel_time64(void)
+{
+	struct timespec64 ts;
+
+	ktime_get_coarse_real_ts64(&ts);
+
+	return ts;
+}
+
+static inline struct timespec64 get_monotonic_coarse64(void)
+{
+	struct timespec64 ts;
+
+	ktime_get_coarse_ts64(&ts);
+
+	return ts;
+}
 
 #endif

include/linux/timekeeping32.h

@@ -11,9 +11,11 @@ unsigned long get_seconds(void);
 
 static inline struct timespec current_kernel_time(void)
 {
-	struct timespec64 now = current_kernel_time64();
+	struct timespec64 ts64;
+
+	ktime_get_coarse_real_ts64(&ts64);
 
-	return timespec64_to_timespec(now);
+	return timespec64_to_timespec(ts64);
 }
 
 /**
@@ -55,13 +57,17 @@ static inline void getrawmonotonic(struct timespec *ts)
 {
 	struct timespec64 ts64;
 
-	getrawmonotonic64(&ts64);
+	ktime_get_raw_ts64(&ts64);
 	*ts = timespec64_to_timespec(ts64);
 }
 
 static inline struct timespec get_monotonic_coarse(void)
 {
-	return timespec64_to_timespec(get_monotonic_coarse64());
+	struct timespec64 ts64;
+
+	ktime_get_coarse_ts64(&ts64);
+
+	return timespec64_to_timespec(ts64);
 }
 
 static inline void getboottime(struct timespec *ts)

kernel/time/timekeeping.c

@@ -1391,12 +1391,12 @@ int timekeeping_notify(struct clocksource *clock)
 }
 
 /**
- * getrawmonotonic64 - Returns the raw monotonic time in a timespec
+ * ktime_get_raw_ts64 - Returns the raw monotonic time in a timespec
  * @ts:		pointer to the timespec64 to be set
  *
  * Returns the raw monotonic time (completely un-modified by ntp)
  */
-void getrawmonotonic64(struct timespec64 *ts)
+void ktime_get_raw_ts64(struct timespec64 *ts)
 {
 	struct timekeeper *tk = &tk_core.timekeeper;
 	unsigned long seq;
@@ -1412,7 +1412,7 @@ void getrawmonotonic64(struct timespec64 *ts)
 	ts->tv_nsec = 0;
 	timespec64_add_ns(ts, nsecs);
 }
-EXPORT_SYMBOL(getrawmonotonic64);
+EXPORT_SYMBOL(ktime_get_raw_ts64);
 
 
 /**
@@ -2114,23 +2114,20 @@ unsigned long get_seconds(void)
 }
 EXPORT_SYMBOL(get_seconds);
 
-struct timespec64 current_kernel_time64(void)
+void ktime_get_coarse_real_ts64(struct timespec64 *ts)
 {
 	struct timekeeper *tk = &tk_core.timekeeper;
-	struct timespec64 now;
 	unsigned long seq;
 
 	do {
 		seq = read_seqcount_begin(&tk_core.seq);
 
-		now = tk_xtime(tk);
+		*ts = tk_xtime(tk);
 	} while (read_seqcount_retry(&tk_core.seq, seq));
-
-	return now;
 }
-EXPORT_SYMBOL(current_kernel_time64);
+EXPORT_SYMBOL(ktime_get_coarse_real_ts64);
 
-struct timespec64 get_monotonic_coarse64(void)
+void ktime_get_coarse_ts64(struct timespec64 *ts)
 {
 	struct timekeeper *tk = &tk_core.timekeeper;
 	struct timespec64 now, mono;
@@ -2143,12 +2140,10 @@ struct timespec64 get_monotonic_coarse64(void)
 		mono = tk->wall_to_monotonic;
 	} while (read_seqcount_retry(&tk_core.seq, seq));
 
-	set_normalized_timespec64(&now, now.tv_sec + mono.tv_sec,
+	set_normalized_timespec64(ts, now.tv_sec + mono.tv_sec,
 				now.tv_nsec + mono.tv_nsec);
-
-	return now;
 }
-EXPORT_SYMBOL(get_monotonic_coarse64);
+EXPORT_SYMBOL(ktime_get_coarse_ts64);
 
 /*
  * Must hold jiffies_lock