[PATCH] kernel: fix-up schedule_timeout() usage

Use schedule_timeout_{,un}interruptible() instead of
set_current_state()/schedule_timeout() to reduce kernel size.

Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 10 insertions, 20 deletions

diff --git a/kernel/compat.c b/kernel/compat.c
index ddfcaaa86623..102296e21ea8 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -48,8 +48,7 @@ static long compat_nanosleep_restart(struct restart_block *restart)
         if (!time_after(expire, now))
                 return 0;
 
-        current->state = TASK_INTERRUPTIBLE;
-        expire = schedule_timeout(expire - now);
+        expire = schedule_timeout_interruptible(expire - now);
         if (expire == 0)
                 return 0;
 
@@ -82,8 +81,7 @@ asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
                 return -EINVAL;
 
         expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec);
-        current->state = TASK_INTERRUPTIBLE;
-        expire = schedule_timeout(expire);
+        expire = schedule_timeout_interruptible(expire);
         if (expire == 0)
                 return 0;
 
@@ -795,8 +793,7 @@ compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
                         recalc_sigpending();
                         spin_unlock_irq(&current->sighand->siglock);
 
-                        current->state = TASK_INTERRUPTIBLE;
-                        timeout = schedule_timeout(timeout);
+                        timeout = schedule_timeout_interruptible(timeout);
 
                         spin_lock_irq(&current->sighand->siglock);
                         sig = dequeue_signal(current, &s, &info);
diff --git a/kernel/signal.c b/kernel/signal.c
index 4980a073237f..b92c3c9f8b9a 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2221,8 +2221,7 @@ sys_rt_sigtimedwait(const sigset_t __user *uthese,
                         recalc_sigpending();
                         spin_unlock_irq(&current->sighand->siglock);
 
-                        current->state = TASK_INTERRUPTIBLE;
-                        timeout = schedule_timeout(timeout);
+                        timeout = schedule_timeout_interruptible(timeout);
 
                         try_to_freeze();
                         spin_lock_irq(&current->sighand->siglock);
diff --git a/kernel/timer.c b/kernel/timer.c
index a0b716d62701..f4152fcd9f8e 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1184,8 +1184,7 @@ static long __sched nanosleep_restart(struct restart_block *restart)
         if (!time_after(expire, now))
                 return 0;
 
-        current->state = TASK_INTERRUPTIBLE;
-        expire = schedule_timeout(expire - now);
+        expire = schedule_timeout_interruptible(expire - now);
 
         ret = 0;
         if (expire) {
@@ -1213,8 +1212,7 @@ asmlinkage long sys_nanosleep(struct timespec __user *rqtp, struct timespec __us
                 return -EINVAL;
 
         expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec);
-        current->state = TASK_INTERRUPTIBLE;
-        expire = schedule_timeout(expire);
+        expire = schedule_timeout_interruptible(expire);
 
         ret = 0;
         if (expire) {
@@ -1612,10 +1610,8 @@ void msleep(unsigned int msecs)
 {
         unsigned long timeout = msecs_to_jiffies(msecs) + 1;
 
-        while (timeout) {
-                set_current_state(TASK_UNINTERRUPTIBLE);
-                timeout = schedule_timeout(timeout);
-        }
+        while (timeout)
+                timeout = schedule_timeout_uninterruptible(timeout);
 }
 
 EXPORT_SYMBOL(msleep);
@@ -1628,10 +1624,8 @@ unsigned long msleep_interruptible(unsigned int msecs)
 {
         unsigned long timeout = msecs_to_jiffies(msecs) + 1;
 
-        while (timeout && !signal_pending(current)) {
-                set_current_state(TASK_INTERRUPTIBLE);
-                timeout = schedule_timeout(timeout);
-        }
+        while (timeout && !signal_pending(current))
+                timeout = schedule_timeout_interruptible(timeout);
         return jiffies_to_msecs(timeout);
 }