[PATCH] hrtimer: switch sys_nanosleep to hrtimer

convert sys_nanosleep() to use hrtimer_nanosleep()

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 14 insertions, 56 deletions

diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 64d37a3c5948..11fde0caee56 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -707,6 +707,20 @@ long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
         return -ERESTART_RESTARTBLOCK;
 }
 
+asmlinkage long
+sys_nanosleep(struct timespec __user *rqtp, struct timespec __user *rmtp)
+{
+        struct timespec tu;
+
+        if (copy_from_user(&tu, rqtp, sizeof(tu)))
+                return -EFAULT;
+
+        if (!timespec_valid(&tu))
+                return -EINVAL;
+
+        return hrtimer_nanosleep(&tu, rmtp, HRTIMER_REL, CLOCK_MONOTONIC);
+}
+
 /*
  * Functions related to boot-time initialization:
  */
diff --git a/kernel/timer.c b/kernel/timer.c
index 80bf2acf6b08..4f1cb0ab5251 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1120,62 +1120,6 @@ asmlinkage long sys_gettid(void)
         return current->pid;
 }
 
-static long __sched nanosleep_restart(struct restart_block *restart)
-{
-        unsigned long expire = restart->arg0, now = jiffies;
-        struct timespec __user *rmtp = (struct timespec __user *) restart->arg1;
-        long ret;
-
-        /* Did it expire while we handled signals? */
-        if (!time_after(expire, now))
-                return 0;
-
-        expire = schedule_timeout_interruptible(expire - now);
-
-        ret = 0;
-        if (expire) {
-                struct timespec t;
-                jiffies_to_timespec(expire, &t);
-
-                ret = -ERESTART_RESTARTBLOCK;
-                if (rmtp && copy_to_user(rmtp, &t, sizeof(t)))
-                        ret = -EFAULT;
-                /* The 'restart' block is already filled in */
-        }
-        return ret;
-}
-
-asmlinkage long sys_nanosleep(struct timespec __user *rqtp, struct timespec __user *rmtp)
-{
-        struct timespec t;
-        unsigned long expire;
-        long ret;
-
-        if (copy_from_user(&t, rqtp, sizeof(t)))
-                return -EFAULT;
-
-        if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0))
-                return -EINVAL;
-
-        expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec);
-        expire = schedule_timeout_interruptible(expire);
-
-        ret = 0;
-        if (expire) {
-                struct restart_block *restart;
-                jiffies_to_timespec(expire, &t);
-                if (rmtp && copy_to_user(rmtp, &t, sizeof(t)))
-                        return -EFAULT;
-
-                restart = &current_thread_info()->restart_block;
-                restart->fn = nanosleep_restart;
-                restart->arg0 = jiffies + expire;
-                restart->arg1 = (unsigned long) rmtp;
-                ret = -ERESTART_RESTARTBLOCK;
-        }
-        return ret;
-}
-
 /*
  * sys_sysinfo - fill in sysinfo struct
  */