posix-timers: Convert clock_settime to clockid_to_kclock()

Use the new kclock decoding function in clock_settime and cleanup all
kclocks which use the default functions. Rename the misnomed
common_clock_set() to posix_clock_realtime_set().

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <johnstul@us.ibm.com>
Tested-by: Richard Cochran <richard.cochran@omicron.at>
LKML-Reference: <20110201134418.518851246@linutronix.de>

3 files changed, 12 insertions, 24 deletions

diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index cd6da067bce1..4aaf0c5c7cea 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -89,9 +89,6 @@ extern struct k_clock clock_posix_cpu;
 
 void register_posix_clock(const clockid_t clock_id, struct k_clock *new_clock);
 
-/* error handlers for timer_create, nanosleep and settime */
-int do_posix_clock_nosettime(const clockid_t, const struct timespec *tp);
-
 /* function to call to trigger timer event */
 int posix_timer_event(struct k_itimer *timr, int si_private);
 
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 8dc4cd7faf89..504fbab10b82 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -1604,7 +1604,6 @@ static __init int init_posix_cpu_timers(void)
         struct k_clock process = {
                 .clock_getres   = process_cpu_clock_getres,
                 .clock_get      = process_cpu_clock_get,
-                .clock_set      = do_posix_clock_nosettime,
                 .timer_create   = process_cpu_timer_create,
                 .nsleep         = process_cpu_nsleep,
                 .nsleep_restart = process_cpu_nsleep_restart,
@@ -1612,7 +1611,6 @@ static __init int init_posix_cpu_timers(void)
         struct k_clock thread = {
                 .clock_getres   = thread_cpu_clock_getres,
                 .clock_get      = thread_cpu_clock_get,
-                .clock_set      = do_posix_clock_nosettime,
                 .timer_create   = thread_cpu_timer_create,
         };
         struct timespec ts;
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 4762986814c8..49f358c37708 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -199,12 +199,6 @@ static int common_clock_get(clockid_t which_clock, struct timespec *tp)
         return 0;
 }
 
-static inline int common_clock_set(const clockid_t which_clock,
-                                   const struct timespec *tp)
-{
-        return do_sys_settimeofday(tp, NULL);
-}
-
 static int common_timer_create(struct k_itimer *new_timer)
 {
         hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0);
@@ -232,6 +226,13 @@ static inline int invalid_clockid(const clockid_t which_clock)
         return 1;
 }
 
+/* Set clock_realtime */
+static int posix_clock_realtime_set(const clockid_t which_clock,
+                                    const struct timespec *tp)
+{
+        return do_sys_settimeofday(tp, NULL);
+}
+
 /*
  * Get monotonic time for posix timers
  */
@@ -276,32 +277,29 @@ static __init int init_posix_timers(void)
 {
         struct k_clock clock_realtime = {
                 .clock_getres   = hrtimer_get_res,
+                .clock_set      = posix_clock_realtime_set,
                 .nsleep         = common_nsleep,
                 .nsleep_restart = hrtimer_nanosleep_restart,
         };
         struct k_clock clock_monotonic = {
                 .clock_getres   = hrtimer_get_res,
                 .clock_get      = posix_ktime_get_ts,
-                .clock_set      = do_posix_clock_nosettime,
                 .nsleep         = common_nsleep,
                 .nsleep_restart = hrtimer_nanosleep_restart,
         };
         struct k_clock clock_monotonic_raw = {
                 .clock_getres   = hrtimer_get_res,
                 .clock_get      = posix_get_monotonic_raw,
-                .clock_set      = do_posix_clock_nosettime,
                 .timer_create   = no_timer_create,
         };
         struct k_clock clock_realtime_coarse = {
                 .clock_getres   = posix_get_coarse_res,
                 .clock_get      = posix_get_realtime_coarse,
-                .clock_set      = do_posix_clock_nosettime,
                 .timer_create   = no_timer_create,
         };
         struct k_clock clock_monotonic_coarse = {
                 .clock_getres   = posix_get_coarse_res,
                 .clock_get      = posix_get_monotonic_coarse,
-                .clock_set      = do_posix_clock_nosettime,
                 .timer_create   = no_timer_create,
         };
 
@@ -940,24 +938,19 @@ void exit_itimers(struct signal_struct *sig)
         }
 }
 
-/* Not available / possible... functions */
-int do_posix_clock_nosettime(const clockid_t clockid, const struct timespec *tp)
-{
-        return -EINVAL;
-}
-EXPORT_SYMBOL_GPL(do_posix_clock_nosettime);
-
 SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
                 const struct timespec __user *, tp)
 {
+        struct k_clock *kc = clockid_to_kclock(which_clock);
         struct timespec new_tp;
 
-        if (invalid_clockid(which_clock))
+        if (!kc || !kc->clock_set)
                 return -EINVAL;
+
         if (copy_from_user(&new_tp, tp, sizeof (*tp)))
                 return -EFAULT;
 
-        return CLOCK_DISPATCH(which_clock, clock_set, (which_clock, &new_tp));
+        return kc->clock_set(which_clock, &new_tp);
 }
 
 SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,