[PATCHv6 06/36] alarmtimer: Provide get_timespec() callback
From: Dmitry Safonov <hidden>
Date: 2019-08-15 16:38:56
Also in:
lkml
Subsystem:
posix clocks and timers, the rest, timekeeping, clocksource core, ntp, alarmtimer · Maintainers:
Anna-Maria Behnsen, Frederic Weisbecker, Thomas Gleixner, Linus Torvalds, John Stultz
From: Andrei Vagin <redacted> 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 <redacted> Signed-off-by: Andrei Vagin <redacted> Co-developed-by: Dmitry Safonov <redacted> Signed-off-by: Dmitry Safonov <redacted> --- include/linux/posix-timers.h | 3 +++ kernel/time/alarmtimer.c | 8 ++++++-- kernel/time/posix-timers.c | 4 ++-- 3 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 604cec0e41ba..ec2b2d8b95f6 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h@@ -128,4 +128,7 @@ void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx, void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new); void posixtimer_rearm(struct kernel_siginfo *info); + +int posix_get_realtime_timespec(clockid_t which_clock, struct timespec64 *tp); +int posix_get_boottime_timespec(const clockid_t which_clock, struct timespec64 *tp); #endif
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 5af13c859d03..7732f0aabf6a 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c@@ -37,12 +37,15 @@ * @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); + int (*get_timespec)(const clockid_t which_clock, + struct timespec64 *tp); clockid_t base_clockid; } alarm_bases[ALARM_NUMTYPE];
@@ -657,8 +660,7 @@ 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()); - return 0; + return base->get_timespec(base->base_clockid, tp); } /**
@@ -869,8 +871,10 @@ 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 = posix_get_realtime_timespec, alarm_bases[ALARM_BOOTTIME].base_clockid = CLOCK_BOOTTIME; alarm_bases[ALARM_BOOTTIME].get_ktime = &ktime_get_boottime; + alarm_bases[ALARM_BOOTTIME].get_timespec = posix_get_boottime_timespec; for (i = 0; i < ALARM_NUMTYPE; i++) { timerqueue_init_head(&alarm_bases[i].timerqueue); spin_lock_init(&alarm_bases[i].lock);
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 4e89e342cfcc..43049c5f1a22 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c@@ -165,7 +165,7 @@ static inline void unlock_timer(struct k_itimer *timr, unsigned long flags) } /* Get clock_realtime */ -static int posix_get_realtime_timespec(clockid_t which_clock, struct timespec64 *tp) +int posix_get_realtime_timespec(clockid_t which_clock, struct timespec64 *tp) { ktime_get_real_ts64(tp); return 0;
@@ -222,7 +222,7 @@ static int posix_get_coarse_res(const clockid_t which_clock, struct timespec64 * return 0; } -static int posix_get_boottime_timespec(const clockid_t which_clock, struct timespec64 *tp) +int posix_get_boottime_timespec(const clockid_t which_clock, struct timespec64 *tp) { ktime_get_boottime_ts64(tp); return 0;
--
2.22.0