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alarmtimer: Provide get_timespec() callback

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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()

Wire up alarm bases with get_timespec().

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/20191112012724.250792-9-dima@arista.com
This commit is contained in:
Andrei Vagin 2019-11-12 01:26:57 +00:00 committed by Thomas Gleixner
parent 41b3b8dffc
commit 2f58bf909a
1 changed files with 6 additions and 1 deletions
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7
kernel/time/alarmtimer.c
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@ -37,12 +37,14 @@
* @lock: Lock for syncrhonized access to the base
* @timerqueue: Timerqueue head managing the list of events
* @get_ktime: Function to read the time correlating to the base
* @get_timespec: Function to read the namespace time correlating to the base
* @base_clockid: clockid for the base
*/
static struct alarm_base {
spinlock_t lock;
struct timerqueue_head timerqueue;
ktime_t (*get_ktime)(void);
void (*get_timespec)(struct timespec64 *tp);
clockid_t base_clockid;
} alarm_bases[ALARM_NUMTYPE];
@ -670,7 +672,8 @@ static int alarm_clock_get_timespec(clockid_t which_clock, struct timespec64 *tp
if (!alarmtimer_get_rtcdev())
return -EINVAL;
*tp = ktime_to_timespec64(base->get_ktime());
base->get_timespec(tp);
return 0;
}
@ -883,8 +886,10 @@ static int __init alarmtimer_init(void)
/* Initialize alarm bases */
alarm_bases[ALARM_REALTIME].base_clockid = CLOCK_REALTIME;
alarm_bases[ALARM_REALTIME].get_ktime = &ktime_get_real;
alarm_bases[ALARM_REALTIME].get_timespec = ktime_get_real_ts64,
alarm_bases[ALARM_BOOTTIME].base_clockid = CLOCK_BOOTTIME;
alarm_bases[ALARM_BOOTTIME].get_ktime = &ktime_get_boottime;
alarm_bases[ALARM_BOOTTIME].get_timespec = ktime_get_boottime_ts64;
for (i = 0; i < ALARM_NUMTYPE; i++) {
timerqueue_init_head(&alarm_bases[i].timerqueue);
spin_lock_init(&alarm_bases[i].lock);