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Subject[tip:timers/core] timekeeping: Remove clocksource inline functions
Commit-ID:  a0f7d48bfb95a4c5172a2756dbc4b82afc8e9ae4
Gitweb: http://git.kernel.org/tip/a0f7d48bfb95a4c5172a2756dbc4b82afc8e9ae4
Author: Martin Schwidefsky <schwidefsky@de.ibm.com>
AuthorDate: Fri, 14 Aug 2009 15:47:19 +0200
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Sat, 15 Aug 2009 10:55:45 +0200

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>


---
include/linux/clocksource.h | 58 -------------------------------------------
kernel/time/timekeeping.c | 41 ++++++++++++++++++++---------
2 files changed, 28 insertions(+), 71 deletions(-)

diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 1219be4..a1ef46f 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -268,64 +268,6 @@ static inline u32 clocksource_hz2mult(u32 hz, u32 shift_constant)
}

/**
- * clocksource_read: - Access the clocksource's current cycle value
- * @cs: pointer to clocksource being read
- *
- * Uses the clocksource to return the current cycle_t value
- */
-static inline cycle_t clocksource_read(struct clocksource *cs)
-{
- return cs->read(cs);
-}
-
-/**
- * clocksource_enable: - enable clocksource
- * @cs: pointer to clocksource
- *
- * Enables the specified clocksource. The clocksource callback
- * function should start up the hardware and setup mult and field
- * members of struct clocksource to reflect hardware capabilities.
- */
-static inline int clocksource_enable(struct clocksource *cs)
-{
- int ret = 0;
-
- if (cs->enable)
- ret = cs->enable(cs);
-
- /*
- * 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.
- */
- cs->mult_orig = cs->mult;
-
- return ret;
-}
-
-/**
- * clocksource_disable: - disable clocksource
- * @cs: pointer to clocksource
- *
- * Disables the specified clocksource. The clocksource callback
- * function should power down the now unused hardware block to
- * save power.
- */
-static inline void clocksource_disable(struct clocksource *cs)
-{
- /*
- * Save mult_orig in mult so clocksource_enable() can
- * restore the value regardless if ->enable() updates
- * the value of mult or not.
- */
- cs->mult = cs->mult_orig;
-
- if (cs->disable)
- cs->disable(cs);
-}
-
-/**
* cyc2ns - converts clocksource cycles to nanoseconds
* @cs: Pointer to clocksource
* @cycles: Cycles
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 @@ static void clocksource_forward_now(void)
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 @@ void getnstimeofday(struct timespec *ts)
*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 @@ ktime_t ktime_get(void)
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 @@ void ktime_get_ts(struct timespec *ts)
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 @@ static void change_clocksource(void)

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 @@ void getrawmonotonic(struct timespec *ts)
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 @@ void __init timekeeping_init(void)
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 @@ static int timekeeping_resume(struct sys_device *dev)
}
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 @@ void update_wall_time(void)
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

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