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posix-clocks: Introduce clock_get_ktime() callback

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The callsite in common_timer_get() has already a comment:
    /*
     * The timespec64 based conversion is suboptimal, but it's not
     * worth to implement yet another callback.
     */
    kc->clock_get(timr->it_clock, &ts64);
    now = timespec64_to_ktime(ts64);

The upcoming support for time namespaces requires to have access to:

 - The time in a task's time namespace for sys_clock_gettime()
 - The time in the root name space for common_timer_get()

That adds a valid reason to finally implement a separate callback which
returns the time in ktime_t format.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Co-developed-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20191112012724.250792-10-dima@arista.com
This commit is contained in:
Andrei Vagin
2019-11-12 01:26:58 +00:00
committed by Thomas Gleixner
parent 2f58bf909a
commit 9c71a2e8a7
3 changed files with 46 additions and 2 deletions
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kernel/time/alarmtimer.c
+18 -1
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@@ -663,7 +663,7 @@ static int alarm_clock_getres(const clockid_t which_clock, struct timespec64 *tp
* @which_clock: clockid
* @tp: timespec to fill.
*
* Provides the underlying alarm base time.
* Provides the underlying alarm base time in a tasks time namespace.
*/
static int alarm_clock_get_timespec(clockid_t which_clock, struct timespec64 *tp)
{
@@ -677,6 +677,22 @@ static int alarm_clock_get_timespec(clockid_t which_clock, struct timespec64 *tp
return 0;
}
/**
* alarm_clock_get_ktime - posix clock_get_ktime interface
* @which_clock: clockid
*
* Provides the underlying alarm base time in the root namespace.
*/
static ktime_t alarm_clock_get_ktime(clockid_t which_clock)
{
struct alarm_base *base = &alarm_bases[clock2alarm(which_clock)];
if (!alarmtimer_get_rtcdev())
return -EINVAL;
return base->get_ktime();
}
/**
* alarm_timer_create - posix timer_create interface
* @new_timer: k_itimer pointer to manage
@@ -840,6 +856,7 @@ static int alarm_timer_nsleep(const clockid_t which_clock, int flags,
const struct k_clock alarm_clock = {
.clock_getres = alarm_clock_getres,
.clock_get_ktime = alarm_clock_get_ktime,
.clock_get_timespec = alarm_clock_get_timespec,
.timer_create = alarm_timer_create,
.timer_set = common_timer_set,