From: Andrei Vagin <ava...@gmail.com>

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 <t...@linutronix.de>
Signed-off-by: Andrei Vagin <ava...@gmail.com>
Co-developed-by: Dmitry Safonov <d...@arista.com>
Signed-off-by: Dmitry Safonov <d...@arista.com>
---
 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

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