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9c71a2e8a7
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
45 lines
1.9 KiB
C
45 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#define TIMER_RETRY 1
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struct k_clock {
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int (*clock_getres)(const clockid_t which_clock,
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struct timespec64 *tp);
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int (*clock_set)(const clockid_t which_clock,
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const struct timespec64 *tp);
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/* Returns the clock value in the current time namespace. */
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int (*clock_get_timespec)(const clockid_t which_clock,
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struct timespec64 *tp);
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/* Returns the clock value in the root time namespace. */
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ktime_t (*clock_get_ktime)(const clockid_t which_clock);
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int (*clock_adj)(const clockid_t which_clock, struct __kernel_timex *tx);
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int (*timer_create)(struct k_itimer *timer);
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int (*nsleep)(const clockid_t which_clock, int flags,
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const struct timespec64 *);
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int (*timer_set)(struct k_itimer *timr, int flags,
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struct itimerspec64 *new_setting,
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struct itimerspec64 *old_setting);
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int (*timer_del)(struct k_itimer *timr);
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void (*timer_get)(struct k_itimer *timr,
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struct itimerspec64 *cur_setting);
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void (*timer_rearm)(struct k_itimer *timr);
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s64 (*timer_forward)(struct k_itimer *timr, ktime_t now);
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ktime_t (*timer_remaining)(struct k_itimer *timr, ktime_t now);
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int (*timer_try_to_cancel)(struct k_itimer *timr);
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void (*timer_arm)(struct k_itimer *timr, ktime_t expires,
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bool absolute, bool sigev_none);
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void (*timer_wait_running)(struct k_itimer *timr);
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};
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extern const struct k_clock clock_posix_cpu;
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extern const struct k_clock clock_posix_dynamic;
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extern const struct k_clock clock_process;
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extern const struct k_clock clock_thread;
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extern const struct k_clock alarm_clock;
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int posix_timer_event(struct k_itimer *timr, int si_private);
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void common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting);
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int common_timer_set(struct k_itimer *timr, int flags,
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struct itimerspec64 *new_setting,
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struct itimerspec64 *old_setting);
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int common_timer_del(struct k_itimer *timer);
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