diff options
| -rw-r--r-- | include/linux/timekeeper_internal.h | 4 | ||||
| -rw-r--r-- | kernel/time/timekeeping.c | 35 |
2 files changed, 19 insertions, 20 deletions
diff --git a/include/linux/timekeeper_internal.h b/include/linux/timekeeper_internal.h index cb88096222c0..75bb8add78f5 100644 --- a/include/linux/timekeeper_internal.h +++ b/include/linux/timekeeper_internal.h @@ -29,6 +29,10 @@ struct timekeeper { /* Current clocksource used for timekeeping. */ struct clocksource *clock; + /* Read function of @clock */ + cycle_t (*read)(struct clocksource *cs); + /* Bitmask for two's complement subtraction of non 64bit counters */ + cycle_t mask; /* Last cycle value */ cycle_t cycle_last; /* NTP adjusted clock multiplier */ diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index 4e748c404749..14b7367e6b94 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -121,7 +121,9 @@ static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock) old_clock = tk->clock; tk->clock = clock; - tk->cycle_last = clock->read(clock); + tk->read = clock->read; + tk->mask = clock->mask; + tk->cycle_last = tk->read(clock); /* Do the ns -> cycle conversion first, using original mult */ tmp = NTP_INTERVAL_LENGTH; @@ -174,15 +176,13 @@ static inline u32 arch_gettimeoffset(void) { return 0; } static inline s64 timekeeping_get_ns(struct timekeeper *tk) { cycle_t cycle_now, delta; - struct clocksource *clock; s64 nsec; /* read clocksource: */ - clock = tk->clock; - cycle_now = clock->read(clock); + cycle_now = tk->read(tk->clock); /* calculate the delta since the last update_wall_time: */ - delta = clocksource_delta(cycle_now, tk->cycle_last, clock->mask); + delta = clocksource_delta(cycle_now, tk->cycle_last, tk->mask); nsec = delta * tk->mult + tk->xtime_nsec; nsec >>= tk->shift; @@ -193,16 +193,15 @@ static inline s64 timekeeping_get_ns(struct timekeeper *tk) static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk) { + struct clocksource *clock = tk->clock; cycle_t cycle_now, delta; - struct clocksource *clock; s64 nsec; /* read clocksource: */ - clock = tk->clock; - cycle_now = clock->read(clock); + cycle_now = tk->read(clock); /* calculate the delta since the last update_wall_time: */ - delta = clocksource_delta(cycle_now, tk->cycle_last, clock->mask); + delta = clocksource_delta(cycle_now, tk->cycle_last, tk->mask); /* convert delta to nanoseconds. */ nsec = clocksource_cyc2ns(delta, clock->mult, clock->shift); @@ -337,13 +336,12 @@ static void timekeeping_update(struct timekeeper *tk, unsigned int action) */ static void timekeeping_forward_now(struct timekeeper *tk) { + struct clocksource *clock = tk->clock; cycle_t cycle_now, delta; - struct clocksource *clock; s64 nsec; - clock = tk->clock; - cycle_now = clock->read(clock); - delta = clocksource_delta(cycle_now, tk->cycle_last, clock->mask); + cycle_now = tk->read(clock); + delta = clocksource_delta(cycle_now, tk->cycle_last, tk->mask); tk->cycle_last = cycle_now; tk->xtime_nsec += delta * tk->mult; @@ -1019,7 +1017,7 @@ static void timekeeping_resume(void) * The less preferred source will only be tried if there is no better * usable source. The rtc part is handled separately in rtc core code. */ - cycle_now = clock->read(clock); + cycle_now = tk->read(clock); if ((clock->flags & CLOCK_SOURCE_SUSPEND_NONSTOP) && cycle_now > tk->cycle_last) { u64 num, max = ULLONG_MAX; @@ -1028,7 +1026,7 @@ static void timekeeping_resume(void) s64 nsec = 0; cycle_delta = clocksource_delta(cycle_now, tk->cycle_last, - clock->mask); + tk->mask); /* * "cycle_delta * mutl" may cause 64 bits overflow, if the @@ -1415,7 +1413,6 @@ static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset, */ void update_wall_time(void) { - struct clocksource *clock; struct timekeeper *real_tk = &tk_core.timekeeper; struct timekeeper *tk = &shadow_timekeeper; cycle_t offset; @@ -1429,13 +1426,11 @@ void update_wall_time(void) if (unlikely(timekeeping_suspended)) goto out; - clock = real_tk->clock; - #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET offset = real_tk->cycle_interval; #else - offset = clocksource_delta(clock->read(clock), tk->cycle_last, - clock->mask); + offset = clocksource_delta(tk->read(tk->clock), tk->cycle_last, + tk->mask); #endif /* Check if there's really nothing to do */ |