time: Remove xtime_cache

With the prior logarithmic time accumulation patch, xtime will now
always be within one "tick" of the current time, instead of
possibly half a second off.

This removes the need for the xtime_cache value, which always
stored the time at the last interrupt, so this patch cleans that up
removing the xtime_cache related code.

This is a bit simpler, but still could use some wider testing.

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: John Kacur <jkacur@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <1254525855.7741.95.camel@localhost.localdomain>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/time.c b/kernel/time.c
index 2e2e469..2ef4fe2 100644 (file)
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -136,7 +136,6 @@ static inline void warp_clock(void)
        write_seqlock_irq(&xtime_lock);
        wall_to_monotonic.tv_sec -= sys_tz.tz_minuteswest * 60;
        xtime.tv_sec += sys_tz.tz_minuteswest * 60;
-       update_xtime_cache(0);
        write_sequnlock_irq(&xtime_lock);
        clock_was_set();
 }

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 5fdd78e..96b3f0d 100644 (file)
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -164,13 +164,6 @@ 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)
 {
@@ -331,8 +324,6 @@ int do_settimeofday(struct timespec *tv)
 
        xtime = *tv;
 
-       update_xtime_cache(0);
-
        timekeeper.ntp_error = 0;
        ntp_clear();
 
@@ -547,7 +538,6 @@ 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);
@@ -581,7 +571,6 @@ 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;
@@ -721,7 +710,6 @@ static void timekeeping_adjust(s64 offset)
                                timekeeper.ntp_error_shift;
 }
 
-
 /**
  * logarithmic_accumulation - shifted accumulation of cycles
  *
@@ -765,7 +753,6 @@ static cycle_t logarithmic_accumulation(cycle_t offset, int shift)
        return offset;
 }
 
-
 /**
  * update_wall_time - Uses the current clocksource to increment the wall time
  *
@@ -775,7 +762,6 @@ void update_wall_time(void)
 {
        struct clocksource *clock;
        cycle_t offset;
-       u64 nsecs;
        int shift = 0, maxshift;
 
        /* Make sure we're fully resumed: */
@@ -841,9 +827,6 @@ 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);
-
        /* check to see if there is a new clocksource to use */
        update_vsyscall(&xtime, timekeeper.clock);
 }
@@ -880,13 +863,13 @@ void monotonic_to_bootbased(struct timespec *ts)
 
 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)
@@ -896,8 +879,7 @@ 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;
@@ -911,8 +893,7 @@ 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));