time: Move wall_to_monotonic into the timekeeper structure

In preparation for locking cleanups, move wall_to_monotonic
into the timekeeper structure.

CC: Thomas Gleixner <tglx@linutronix.de>
CC: Eric Dumazet <eric.dumazet@gmail.com>
CC: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 8427cc20bad62a6e122bfd51d6b4f33de6adfc3d..5655ca3a86d77e42be3df2477ab610409b9cd83c 100644 (file)
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -48,6 +48,21 @@ struct timekeeper {
        /* NTP adjusted clock multiplier */
        u32     mult;
 
+       /*
+        * wall_to_monotonic is what we need to add to xtime (or xtime corrected
+        * for sub jiffie times) to get to monotonic time.  Monotonic is pegged
+        * at zero at system boot time, so wall_to_monotonic will be negative,
+        * however, we will ALWAYS keep the tv_nsec part positive so we can use
+        * the usual normalization.
+        *
+        * wall_to_monotonic is moved after resume from suspend for the
+        * monotonic time not to jump. We need to add total_sleep_time to
+        * wall_to_monotonic to get the real boot based time offset.
+        *
+        * - wall_to_monotonic is no longer the boot time, getboottime must be
+        * used instead.
+        */
+       struct timespec wall_to_monotonic;
        /* time spent in suspend */
        struct timespec total_sleep_time;
 
@@ -148,21 +163,8 @@ __cacheline_aligned_in_smp DEFINE_SEQLOCK(xtime_lock);
 
 /*
  * The current time
- * wall_to_monotonic is what we need to add to xtime (or xtime corrected
- * for sub jiffie times) to get to monotonic time.  Monotonic is pegged
- * at zero at system boot time, so wall_to_monotonic will be negative,
- * however, we will ALWAYS keep the tv_nsec part positive so we can use
- * the usual normalization.
- *
- * wall_to_monotonic is moved after resume from suspend for the monotonic
- * time not to jump. We need to add total_sleep_time to wall_to_monotonic
- * to get the real boot based time offset.
- *
- * - wall_to_monotonic is no longer the boot time, getboottime must be
- * used instead.
  */
 static struct timespec xtime __attribute__ ((aligned (16)));
-static struct timespec wall_to_monotonic __attribute__ ((aligned (16)));
 
 /*
  * The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock.
@@ -176,8 +178,8 @@ int __read_mostly timekeeping_suspended;
 void timekeeping_leap_insert(int leapsecond)
 {
        xtime.tv_sec += leapsecond;
-       wall_to_monotonic.tv_sec -= leapsecond;
-       update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
+       timekeeper.wall_to_monotonic.tv_sec -= leapsecond;
+       update_vsyscall(&xtime, &timekeeper.wall_to_monotonic, timekeeper.clock,
                        timekeeper.mult);
 }
 
@@ -249,8 +251,8 @@ ktime_t ktime_get(void)
 
        do {
                seq = read_seqbegin(&xtime_lock);
-               secs = xtime.tv_sec + wall_to_monotonic.tv_sec;
-               nsecs = xtime.tv_nsec + wall_to_monotonic.tv_nsec;
+               secs = xtime.tv_sec + timekeeper.wall_to_monotonic.tv_sec;
+               nsecs = xtime.tv_nsec + timekeeper.wall_to_monotonic.tv_nsec;
                nsecs += timekeeping_get_ns();
                /* If arch requires, add in gettimeoffset() */
                nsecs += arch_gettimeoffset();
@@ -283,7 +285,7 @@ void ktime_get_ts(struct timespec *ts)
        do {
                seq = read_seqbegin(&xtime_lock);
                *ts = xtime;
-               tomono = wall_to_monotonic;
+               tomono = timekeeper.wall_to_monotonic;
                nsecs = timekeeping_get_ns();
                /* If arch requires, add in gettimeoffset() */
                nsecs += arch_gettimeoffset();
@@ -374,14 +376,15 @@ int do_settimeofday(const struct timespec *tv)
 
        ts_delta.tv_sec = tv->tv_sec - xtime.tv_sec;
        ts_delta.tv_nsec = tv->tv_nsec - xtime.tv_nsec;
-       wall_to_monotonic = timespec_sub(wall_to_monotonic, ts_delta);
+       timekeeper.wall_to_monotonic =
+                       timespec_sub(timekeeper.wall_to_monotonic, ts_delta);
 
        xtime = *tv;
 
        timekeeper.ntp_error = 0;
        ntp_clear();
 
-       update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
+       update_vsyscall(&xtime, &timekeeper.wall_to_monotonic, timekeeper.clock,
                                timekeeper.mult);
 
        write_sequnlock_irqrestore(&xtime_lock, flags);
@@ -413,12 +416,13 @@ int timekeeping_inject_offset(struct timespec *ts)
        timekeeping_forward_now();
 
        xtime = timespec_add(xtime, *ts);
-       wall_to_monotonic = timespec_sub(wall_to_monotonic, *ts);
+       timekeeper.wall_to_monotonic =
+                               timespec_sub(timekeeper.wall_to_monotonic, *ts);
 
        timekeeper.ntp_error = 0;
        ntp_clear();
 
-       update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
+       update_vsyscall(&xtime, &timekeeper.wall_to_monotonic, timekeeper.clock,
                                timekeeper.mult);
 
        write_sequnlock_irqrestore(&xtime_lock, flags);
@@ -592,7 +596,7 @@ void __init timekeeping_init(void)
                boot.tv_sec = xtime.tv_sec;
                boot.tv_nsec = xtime.tv_nsec;
        }
-       set_normalized_timespec(&wall_to_monotonic,
+       set_normalized_timespec(&timekeeper.wall_to_monotonic,
                                -boot.tv_sec, -boot.tv_nsec);
        timekeeper.total_sleep_time.tv_sec = 0;
        timekeeper.total_sleep_time.tv_nsec = 0;
@@ -618,7 +622,8 @@ static void __timekeeping_inject_sleeptime(struct timespec *delta)
        }
 
        xtime = timespec_add(xtime, *delta);
-       wall_to_monotonic = timespec_sub(wall_to_monotonic, *delta);
+       timekeeper.wall_to_monotonic =
+                       timespec_sub(timekeeper.wall_to_monotonic, *delta);
        timekeeper.total_sleep_time = timespec_add(
                                        timekeeper.total_sleep_time, *delta);
 }
@@ -651,7 +656,7 @@ void timekeeping_inject_sleeptime(struct timespec *delta)
 
        timekeeper.ntp_error = 0;
        ntp_clear();
-       update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
+       update_vsyscall(&xtime, &timekeeper.wall_to_monotonic, timekeeper.clock,
                                timekeeper.mult);
 
        write_sequnlock_irqrestore(&xtime_lock, flags);
@@ -1060,7 +1065,7 @@ static void update_wall_time(void)
        }
 
        /* check to see if there is a new clocksource to use */
-       update_vsyscall(&xtime, &wall_to_monotonic, timekeeper.clock,
+       update_vsyscall(&xtime, &timekeeper.wall_to_monotonic, timekeeper.clock,
                                timekeeper.mult);
 }
 
@@ -1078,9 +1083,9 @@ static void update_wall_time(void)
 void getboottime(struct timespec *ts)
 {
        struct timespec boottime = {
-               .tv_sec = wall_to_monotonic.tv_sec +
+               .tv_sec = timekeeper.wall_to_monotonic.tv_sec +
                                timekeeper.total_sleep_time.tv_sec,
-               .tv_nsec = wall_to_monotonic.tv_nsec +
+               .tv_nsec = timekeeper.wall_to_monotonic.tv_nsec +
                                timekeeper.total_sleep_time.tv_nsec
        };
 
@@ -1109,7 +1114,7 @@ void get_monotonic_boottime(struct timespec *ts)
        do {
                seq = read_seqbegin(&xtime_lock);
                *ts = xtime;
-               tomono = wall_to_monotonic;
+               tomono = timekeeper.wall_to_monotonic;
                sleep = timekeeper.total_sleep_time;
                nsecs = timekeeping_get_ns();
 
@@ -1182,7 +1187,7 @@ struct timespec get_monotonic_coarse(void)
                seq = read_seqbegin(&xtime_lock);
 
                now = xtime;
-               mono = wall_to_monotonic;
+               mono = timekeeper.wall_to_monotonic;
        } while (read_seqretry(&xtime_lock, seq));
 
        set_normalized_timespec(&now, now.tv_sec + mono.tv_sec,
@@ -1217,7 +1222,7 @@ void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim,
        do {
                seq = read_seqbegin(&xtime_lock);
                *xtim = xtime;
-               *wtom = wall_to_monotonic;
+               *wtom = timekeeper.wall_to_monotonic;
                *sleep = timekeeper.total_sleep_time;
        } while (read_seqretry(&xtime_lock, seq));
 }
@@ -1232,7 +1237,7 @@ ktime_t ktime_get_monotonic_offset(void)
 
        do {
                seq = read_seqbegin(&xtime_lock);
-               wtom = wall_to_monotonic;
+               wtom = timekeeper.wall_to_monotonic;
        } while (read_seqretry(&xtime_lock, seq));
        return timespec_to_ktime(wtom);
 }