timers: Export CLOCK_BOOTTIME via the posix timers interface
John Stultz [Tue, 15 Feb 2011 18:52:57 +0000 (10:52 -0800)]
This patch exports CLOCK_BOOTTIME through the posix timers interface

CC: Jamie Lokier <jamie@shareable.org>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Alexander Shishkin <virtuoso@slind.org>
CC: Arve Hjønnevåg <arve@android.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>

kernel/posix-timers.c

index 44fcff1..4c01249 100644 (file)
@@ -187,7 +187,7 @@ static int posix_ktime_get_ts(clockid_t which_clock, struct timespec *tp)
 }
 
 /*
- * Get monotonic time for posix timers
+ * Get monotonic-raw time for posix timers
  */
 static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec *tp)
 {
@@ -214,6 +214,14 @@ static int posix_get_coarse_res(const clockid_t which_clock, struct timespec *tp
        *tp = ktime_to_timespec(KTIME_LOW_RES);
        return 0;
 }
+
+static int posix_get_boottime(const clockid_t which_clock, struct timespec *tp)
+{
+       get_monotonic_boottime(tp);
+       return 0;
+}
+
+
 /*
  * Initialize everything, well, just everything in Posix clocks/timers ;)
  */
@@ -253,12 +261,23 @@ static __init int init_posix_timers(void)
                .clock_getres   = posix_get_coarse_res,
                .clock_get      = posix_get_monotonic_coarse,
        };
+       struct k_clock clock_boottime = {
+               .clock_getres   = hrtimer_get_res,
+               .clock_get      = posix_get_boottime,
+               .nsleep         = common_nsleep,
+               .nsleep_restart = hrtimer_nanosleep_restart,
+               .timer_create   = common_timer_create,
+               .timer_set      = common_timer_set,
+               .timer_get      = common_timer_get,
+               .timer_del      = common_timer_del,
+       };
 
        posix_timers_register_clock(CLOCK_REALTIME, &clock_realtime);
        posix_timers_register_clock(CLOCK_MONOTONIC, &clock_monotonic);
        posix_timers_register_clock(CLOCK_MONOTONIC_RAW, &clock_monotonic_raw);
        posix_timers_register_clock(CLOCK_REALTIME_COARSE, &clock_realtime_coarse);
        posix_timers_register_clock(CLOCK_MONOTONIC_COARSE, &clock_monotonic_coarse);
+       posix_timers_register_clock(CLOCK_BOOTTIME, &clock_boottime);
 
        posix_timers_cache = kmem_cache_create("posix_timers_cache",
                                        sizeof (struct k_itimer), 0, SLAB_PANIC,