timekeeping: Remove clocksource inline functions
The three inline functions clocksource_read, clocksource_enable and
clocksource_disable are simple wrappers of an indirect call plus the
copy from and to the mult_orig value. The functions are exclusively
used by the timekeeping code which has intimate knowledge of the
clocksource anyway. Therefore remove the inline functions. No
functional change.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Acked-by: John Stultz <johnstul@us.ibm.com>
Cc: Daniel Walker <dwalker@fifo99.com>
LKML-Reference: <20090814134807.903108946@de.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index b8b70fb..016a259 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -79,7 +79,7 @@
cycle_t cycle_now, cycle_delta;
s64 nsec;
- cycle_now = clocksource_read(clock);
+ cycle_now = clock->read(clock);
cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
clock->cycle_last = cycle_now;
@@ -114,7 +114,7 @@
*ts = xtime;
/* read clocksource: */
- cycle_now = clocksource_read(clock);
+ cycle_now = clock->read(clock);
/* calculate the delta since the last update_wall_time: */
cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
@@ -146,7 +146,7 @@
nsecs = xtime.tv_nsec + wall_to_monotonic.tv_nsec;
/* read clocksource: */
- cycle_now = clocksource_read(clock);
+ cycle_now = clock->read(clock);
/* calculate the delta since the last update_wall_time: */
cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
@@ -186,7 +186,7 @@
tomono = wall_to_monotonic;
/* read clocksource: */
- cycle_now = clocksource_read(clock);
+ cycle_now = clock->read(clock);
/* calculate the delta since the last update_wall_time: */
cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
@@ -274,16 +274,29 @@
clocksource_forward_now();
- if (clocksource_enable(new))
+ if (new->enable && !new->enable(new))
return;
+ /*
+ * The frequency may have changed while the clocksource
+ * was disabled. If so the code in ->enable() must update
+ * the mult value to reflect the new frequency. Make sure
+ * mult_orig follows this change.
+ */
+ new->mult_orig = new->mult;
new->raw_time = clock->raw_time;
old = clock;
clock = new;
- clocksource_disable(old);
+ /*
+ * Save mult_orig in mult so that the value can be restored
+ * regardless if ->enable() updates the value of mult or not.
+ */
+ old->mult = old->mult_orig;
+ if (old->disable)
+ old->disable(old);
clock->cycle_last = 0;
- clock->cycle_last = clocksource_read(clock);
+ clock->cycle_last = clock->read(clock);
clock->error = 0;
clock->xtime_nsec = 0;
clocksource_calculate_interval(clock, NTP_INTERVAL_LENGTH);
@@ -373,7 +386,7 @@
seq = read_seqbegin(&xtime_lock);
/* read clocksource: */
- cycle_now = clocksource_read(clock);
+ cycle_now = clock->read(clock);
/* calculate the delta since the last update_wall_time: */
cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
@@ -435,9 +448,12 @@
ntp_init();
clock = clocksource_get_next();
- clocksource_enable(clock);
+ if (clock->enable)
+ clock->enable(clock);
+ /* set mult_orig on enable */
+ clock->mult_orig = clock->mult;
clocksource_calculate_interval(clock, NTP_INTERVAL_LENGTH);
- clock->cycle_last = clocksource_read(clock);
+ clock->cycle_last = clock->read(clock);
xtime.tv_sec = sec;
xtime.tv_nsec = 0;
@@ -477,8 +493,7 @@
}
update_xtime_cache(0);
/* re-base the last cycle value */
- clock->cycle_last = 0;
- clock->cycle_last = clocksource_read(clock);
+ clock->cycle_last = clock->read(clock);
clock->error = 0;
timekeeping_suspended = 0;
write_sequnlock_irqrestore(&xtime_lock, flags);
@@ -630,7 +645,7 @@
return;
#ifdef CONFIG_GENERIC_TIME
- offset = (clocksource_read(clock) - clock->cycle_last) & clock->mask;
+ offset = (clock->read(clock) - clock->cycle_last) & clock->mask;
#else
offset = clock->cycle_interval;
#endif