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timekeeping: Use ktime_t based data for ktime_get()

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Speed up ktime_get() by using ktime_t based data. Text size shrinks by
64 bytes on x8664.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Thomas Gleixner 2014-07-16 21:04:12 +00:00 committed by John Stultz
parent 7c032df557
commit a016a5bd62
1 changed files with 5 additions and 4 deletions
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9
kernel/time/timekeeping.c
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@ -407,18 +407,19 @@ ktime_t ktime_get(void)
{ {
struct timekeeper *tk = &tk_core.timekeeper; struct timekeeper *tk = &tk_core.timekeeper;
unsigned int seq; unsigned int seq;
s64 secs, nsecs; ktime_t base;
s64 nsecs;
WARN_ON(timekeeping_suspended); WARN_ON(timekeeping_suspended);
do { do {
seq = read_seqcount_begin(&tk_core.seq); seq = read_seqcount_begin(&tk_core.seq);
secs = tk->xtime_sec + tk->wall_to_monotonic.tv_sec; base = tk->base_mono;
nsecs = timekeeping_get_ns(tk) + tk->wall_to_monotonic.tv_nsec; nsecs = timekeeping_get_ns(tk);
} while (read_seqcount_retry(&tk_core.seq, seq)); } while (read_seqcount_retry(&tk_core.seq, seq));
return ktime_set(secs, nsecs); return ktime_add_ns(base, nsecs);
} }
EXPORT_SYMBOL_GPL(ktime_get); EXPORT_SYMBOL_GPL(ktime_get);