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timekeeping: Simplify getboottime()

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Subtracting plain nsec values and converting to timespec is simpler
than the whole timespec math. Not really fastpath code, so the
division is not an issue.

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 21:04:58 +00:00 committed by John Stultz
parent 48f18fd6ad
commit 02cba1598a
1 changed files with 2 additions and 7 deletions
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9
kernel/time/timekeeping.c
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@ -1525,14 +1525,9 @@ out:
void getboottime(struct timespec *ts)
{
struct timekeeper *tk = &tk_core.timekeeper;
struct timespec boottime = {
.tv_sec = tk->wall_to_monotonic.tv_sec +
tk->total_sleep_time.tv_sec,
.tv_nsec = tk->wall_to_monotonic.tv_nsec +
tk->total_sleep_time.tv_nsec
};
ktime_t t = ktime_sub(tk->offs_real, tk->offs_boot);
set_normalized_timespec(ts, -boottime.tv_sec, -boottime.tv_nsec);
*ts = ktime_to_timespec(t);
}
EXPORT_SYMBOL_GPL(getboottime);