time: Remove xtime_cache

[pandora-kernel.git] / kernel / time / timekeeping.c

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 1673637..1137f24 100644 (file)
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -165,13 +165,6 @@ struct timespec raw_time;
 /* flag for if timekeeping is suspended */
 int __read_mostly timekeeping_suspended;
 
-static struct timespec xtime_cache __attribute__ ((aligned (16)));
-void update_xtime_cache(u64 nsec)
-{
-       xtime_cache = xtime;
-       timespec_add_ns(&xtime_cache, nsec);
-}
-
 /* must hold xtime_lock */
 void timekeeping_leap_insert(int leapsecond)
 {
@@ -332,8 +325,6 @@ int do_settimeofday(struct timespec *tv)
 
        xtime = *tv;
 
-       update_xtime_cache(0);
-
        timekeeper.ntp_error = 0;
        ntp_clear();
 
@@ -559,7 +550,6 @@ void __init timekeeping_init(void)
        }
        set_normalized_timespec(&wall_to_monotonic,
                                -boot.tv_sec, -boot.tv_nsec);
-       update_xtime_cache(0);
        total_sleep_time.tv_sec = 0;
        total_sleep_time.tv_nsec = 0;
        write_sequnlock_irqrestore(&xtime_lock, flags);
@@ -593,7 +583,6 @@ static int timekeeping_resume(struct sys_device *dev)
                wall_to_monotonic = timespec_sub(wall_to_monotonic, ts);
                total_sleep_time = timespec_add_safe(total_sleep_time, ts);
        }
-       update_xtime_cache(0);
        /* re-base the last cycle value */
        timekeeper.clock->cycle_last = timekeeper.clock->read(timekeeper.clock);
        timekeeper.ntp_error = 0;
@@ -788,7 +777,6 @@ void update_wall_time(void)
 {
        struct clocksource *clock;
        cycle_t offset;
-       u64 nsecs;
        int shift = 0, maxshift;
 
        /* Make sure we're fully resumed: */
@@ -846,7 +834,9 @@ void update_wall_time(void)
                timekeeper.ntp_error += neg << timekeeper.ntp_error_shift;
        }
 
-       /* store full nanoseconds into xtime after rounding it up and
+
+       /*
+        * Store full nanoseconds into xtime after rounding it up and
         * add the remainder to the error difference.
         */
        xtime.tv_nsec = ((s64) timekeeper.xtime_nsec >> timekeeper.shift) + 1;
@@ -854,8 +844,15 @@ void update_wall_time(void)
        timekeeper.ntp_error += timekeeper.xtime_nsec <<
                                timekeeper.ntp_error_shift;
 
-       nsecs = clocksource_cyc2ns(offset, timekeeper.mult, timekeeper.shift);
-       update_xtime_cache(nsecs);
+       /*
+        * Finally, make sure that after the rounding
+        * xtime.tv_nsec isn't larger then NSEC_PER_SEC
+        */
+       if (unlikely(xtime.tv_nsec >= NSEC_PER_SEC)) {
+               xtime.tv_nsec -= NSEC_PER_SEC;
+               xtime.tv_sec++;
+               second_overflow();
+       }
 
        /* check to see if there is a new clocksource to use */
        update_vsyscall(&xtime, timekeeper.clock, timekeeper.mult);
@@ -895,13 +892,13 @@ EXPORT_SYMBOL_GPL(monotonic_to_bootbased);
 
 unsigned long get_seconds(void)
 {
-       return xtime_cache.tv_sec;
+       return xtime.tv_sec;
 }
 EXPORT_SYMBOL(get_seconds);
 
 struct timespec __current_kernel_time(void)
 {
-       return xtime_cache;
+       return xtime;
 }
 
 struct timespec current_kernel_time(void)
@@ -912,7 +909,7 @@ struct timespec current_kernel_time(void)
        do {
                seq = read_seqbegin(&xtime_lock);
 
-               now = xtime_cache;
+               now = xtime;
        } while (read_seqretry(&xtime_lock, seq));
 
        return now;
@@ -927,7 +924,7 @@ struct timespec get_monotonic_coarse(void)
        do {
                seq = read_seqbegin(&xtime_lock);
 
-               now = xtime_cache;
+               now = xtime;
                mono = wall_to_monotonic;
        } while (read_seqretry(&xtime_lock, seq));