posix-timers: Convert clock_nanosleep to clockid_to_kclock()

Use the new kclock decoding function in clock_nanosleep and cleanup all
kclocks which use the default functions.

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: <20110201134418.034175556@linutronix.de>

3 files changed, 7 insertions, 22 deletions

diff --git a/drivers/char/mmtimer.c b/drivers/char/mmtimer.c
index fd51cd8ee063..262d10453cb8 100644
--- a/drivers/char/mmtimer.c
+++ b/drivers/char/mmtimer.c
@@ -768,7 +768,6 @@ static struct k_clock sgi_clock = {
         .clock_set      = sgi_clock_set,
         .clock_get      = sgi_clock_get,
         .timer_create   = sgi_timer_create,
-        .nsleep         = do_posix_clock_nonanosleep,
         .timer_set      = sgi_timer_set,
         .timer_del      = sgi_timer_del,
         .timer_get      = sgi_timer_get
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 1330ff331526..cd6da067bce1 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -90,8 +90,6 @@ 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_nonanosleep(const clockid_t, int flags, struct timespec *,
-                               struct timespec __user *);
 int do_posix_clock_nosettime(const clockid_t, const struct timespec *tp);
 
 /* function to call to trigger timer event */
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 14b0a70ffb1e..ee69b216d5c3 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -216,12 +216,6 @@ static int no_timer_create(struct k_itimer *new_timer)
         return -EOPNOTSUPP;
 }
 
-static int no_nsleep(const clockid_t which_clock, int flags,
-                     struct timespec *tsave, struct timespec __user *rmtp)
-{
-        return -EOPNOTSUPP;
-}
-
 /*
  * Return nonzero if we know a priori this clockid_t value is bogus.
  */
@@ -282,32 +276,31 @@ static __init int init_posix_timers(void)
 {
         struct k_clock clock_realtime = {
                 .clock_getres   = hrtimer_get_res,
+                .nsleep         = common_nsleep,
         };
         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,
         };
         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,
-                .nsleep         = no_nsleep,
         };
         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,
-                .nsleep         = no_nsleep,
         };
         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,
-                .nsleep         = no_nsleep,
         };
 
         register_posix_clock(CLOCK_REALTIME, &clock_realtime);
@@ -952,13 +945,6 @@ int do_posix_clock_nosettime(const clockid_t clockid, const struct timespec *tp)
 }
 EXPORT_SYMBOL_GPL(do_posix_clock_nosettime);
 
-int do_posix_clock_nonanosleep(const clockid_t clock, int flags,
-                               struct timespec *t, struct timespec __user *r)
-{
-        return -ENANOSLEEP_NOTSUP;
-}
-EXPORT_SYMBOL_GPL(do_posix_clock_nonanosleep);
-
 SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
                 const struct timespec __user *, tp)
 {
@@ -1023,10 +1009,13 @@ SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
                 const struct timespec __user *, rqtp,
                 struct timespec __user *, rmtp)
 {
+        struct k_clock *kc = clockid_to_kclock(which_clock);
         struct timespec t;
 
-        if (invalid_clockid(which_clock))
+        if (!kc)
                 return -EINVAL;
+        if (!kc->nsleep)
+                return -ENANOSLEEP_NOTSUP;
 
         if (copy_from_user(&t, rqtp, sizeof (struct timespec)))
                 return -EFAULT;
@@ -1034,8 +1023,7 @@ SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
         if (!timespec_valid(&t))
                 return -EINVAL;
 
-        return CLOCK_DISPATCH(which_clock, nsleep,
-                              (which_clock, flags, &t, rmtp));
+        return kc->nsleep(which_clock, flags, &t, rmtp);
 }
 
 /*