diff options
| author | Andrei Vagin <avagin@gmail.com> | 2019-11-12 02:26:58 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-01-14 12:20:51 +0100 |
| commit | 9c71a2e8a757bc6aee256bc97c6fb711144b0a0f (patch) | |
| tree | a0a11da36b1c82409506d496dc7b779b9d8bce27 /kernel/time/posix-timers.h | |
| parent | alarmtimer: Provide get_timespec() callback (diff) | |
| download | linux-9c71a2e8a757bc6aee256bc97c6fb711144b0a0f.tar.xz linux-9c71a2e8a757bc6aee256bc97c6fb711144b0a0f.zip | |
posix-clocks: Introduce clock_get_ktime() callback
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
Diffstat (limited to 'kernel/time/posix-timers.h')
| -rw-r--r-- | kernel/time/posix-timers.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/time/posix-timers.h b/kernel/time/posix-timers.h index 070611b2c253..f32a2ebba9b8 100644 --- a/kernel/time/posix-timers.h +++ b/kernel/time/posix-timers.h @@ -6,8 +6,11 @@ struct k_clock { struct timespec64 *tp); int (*clock_set)(const clockid_t which_clock, const struct timespec64 *tp); + /* Returns the clock value in the current time namespace. */ int (*clock_get_timespec)(const clockid_t which_clock, struct timespec64 *tp); + /* Returns the clock value in the root time namespace. */ + ktime_t (*clock_get_ktime)(const clockid_t which_clock); int (*clock_adj)(const clockid_t which_clock, struct __kernel_timex *tx); int (*timer_create)(struct k_itimer *timer); int (*nsleep)(const clockid_t which_clock, int flags, |