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posix-cpu-timers: Avoid timespec conversion in do_cpu_nanosleep() 

No point in converting the expiry time back and forth.

No point either to update the value in the caller supplied variable. mark
the rqtp argument const.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
This commit is contained in:
Thomas Gleixner 2017-06-13 23:29:14 +02:00
parent 2b2d02856b
commit 343d8fc208
1 changed files with 5 additions and 4 deletions
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9
kernel/time/posix-cpu-timers.c
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@ -1227,10 +1227,11 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
}
static int do_cpu_nanosleep(const clockid_t which_clock, int flags,
struct timespec64 *rqtp)
const struct timespec64 *rqtp)
{
struct k_itimer timer;
struct itimerspec64 it;
struct k_itimer timer;
u64 expires;
int error;
/*
@ -1279,7 +1280,7 @@ static int do_cpu_nanosleep(const clockid_t which_clock, int flags,
/*
* We were interrupted by a signal.
*/
*rqtp = ns_to_timespec64(timer.it.cpu.expires);
expires = timer.it.cpu.expires;
error = posix_cpu_timer_set(&timer, 0, &zero_it, &it);
if (!error) {
/*
@ -1312,7 +1313,7 @@ static int do_cpu_nanosleep(const clockid_t which_clock, int flags,
* Report back to the user the time still remaining.
*/
restart = &current->restart_block;
restart->nanosleep.expires = timespec64_to_ns(rqtp);
restart->nanosleep.expires = expires;
if (restart->nanosleep.type != TT_NONE) {
struct timespec ts;