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Subject[PATCH 6/8] time: Move arch_gettimeoffset() usage into timekeeping_get_ns()
Date
Since we call arch_gettimeoffset() in all the accessor
functions, move arch_gettimeoffset() calls into
timekeeping_get_ns() and timekeeping_get_ns_raw() to simplify
the code.

This also makes the code easier to maintain as we don't have to
worry about forgetting the arch_gettimeoffset() as has happened
in the past.

CC: Ingo Molnar <mingo@kernel.org>
CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Richard Cochran <richardcochran@gmail.com>
CC: Prarit Bhargava <prarit@redhat.com>
CC: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <johnstul@us.ibm.com>
---
kernel/time/timekeeping.c | 32 +++++++++++++-------------------
1 file changed, 13 insertions(+), 19 deletions(-)
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 5ffb2b6..dd119355 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -195,13 +195,18 @@ static inline s64 timekeeping_get_ns(void)
cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;

nsec = cycle_delta * timekeeper.mult + timekeeper.xtime_nsec;
- return nsec >> timekeeper.shift;
+ nsec >>= timekeeper.shift;
+
+ /* If arch requires, add in gettimeoffset() */
+ nsec += arch_gettimeoffset();
+ return nsec;
}

static inline s64 timekeeping_get_ns_raw(void)
{
cycle_t cycle_now, cycle_delta;
struct clocksource *clock;
+ s64 nsec;

/* read clocksource: */
clock = timekeeper.clock;
@@ -210,8 +215,13 @@ static inline s64 timekeeping_get_ns_raw(void)
/* calculate the delta since the last update_wall_time: */
cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;

- /* return delta convert to nanoseconds. */
- return clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift);
+ /* convert delta to nanoseconds. */
+ nsec = clocksource_cyc2ns(cycle_delta, clock->mult, clock->shift);
+
+ /* If arch requires, add in gettimeoffset() */
+ nsec += arch_gettimeoffset();
+ return nsec;
+
}

static void update_rt_offset(void)
@@ -286,9 +296,6 @@ void getnstimeofday(struct timespec *ts)
ts->tv_sec = timekeeper.xtime_sec;
ts->tv_nsec = timekeeping_get_ns();

- /* If arch requires, add in gettimeoffset() */
- nsecs += arch_gettimeoffset();
-
} while (read_seqretry(&timekeeper.lock, seq));

timespec_add_ns(ts, nsecs);
@@ -308,8 +315,6 @@ ktime_t ktime_get(void)
timekeeper.wall_to_monotonic.tv_sec;
nsecs = timekeeping_get_ns() +
timekeeper.wall_to_monotonic.tv_nsec;
- /* If arch requires, add in gettimeoffset() */
- nsecs += arch_gettimeoffset();

} while (read_seqretry(&timekeeper.lock, seq));
/*
@@ -340,8 +345,6 @@ void ktime_get_ts(struct timespec *ts)
ts->tv_sec = timekeeper.xtime_sec;
ts->tv_nsec = timekeeping_get_ns();
tomono = timekeeper.wall_to_monotonic;
- /* If arch requires, add in gettimeoffset() */
- ts->tv_nsec += arch_gettimeoffset();

} while (read_seqretry(&timekeeper.lock, seq));

@@ -369,8 +372,6 @@ void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real)
WARN_ON_ONCE(timekeeping_suspended);

do {
- u32 arch_offset;
-
seq = read_seqbegin(&timekeeper.lock);

*ts_raw = timekeeper.raw_time;
@@ -380,11 +381,6 @@ void getnstime_raw_and_real(struct timespec *ts_raw, struct timespec *ts_real)
nsecs_raw = timekeeping_get_ns_raw();
nsecs_real = timekeeping_get_ns();

- /* If arch requires, add in gettimeoffset() */
- arch_offset = arch_gettimeoffset();
- nsecs_raw += arch_offset;
- nsecs_real += arch_offset;
-
} while (read_seqretry(&timekeeper.lock, seq));

timespec_add_ns(ts_raw, nsecs_raw);
@@ -1342,8 +1338,6 @@ ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot)

secs = timekeeper.xtime_sec;
nsecs = timekeeping_get_ns();
- /* If arch requires, add in gettimeoffset() */
- nsecs += arch_gettimeoffset();

*offs_real = timekeeper.offs_real;
*offs_boot = timekeeper.offs_boot;
--
1.7.9.5


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