Merge branch 'master'

[pandora-kernel.git] / kernel / timer.c

diff --git a/kernel/timer.c b/kernel/timer.c
index 13e2b51..6a2e5f8 100644 (file)
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -752,6 +752,15 @@ static void second_overflow(void)
     else
        time_adj += (time_adj >> 2) + (time_adj >> 5);
 #endif
+#if HZ == 250
+    /* Compensate for (HZ==250) != (1 << SHIFT_HZ).
+     * Add 1.5625% and 0.78125% to get 255.85938; => only 0.05% error (p. 14)
+     */
+    if (time_adj < 0)
+       time_adj -= (-time_adj >> 6) + (-time_adj >> 7);
+    else
+       time_adj += (time_adj >> 6) + (time_adj >> 7);
+#endif
 #if HZ == 1000
     /* Compensate for (HZ==1000) != (1 << SHIFT_HZ).
      * Add 1.5625% and 0.78125% to get 1023.4375; => only 0.05% error (p. 14)
@@ -1151,9 +1160,26 @@ fastcall signed long __sched schedule_timeout(signed long timeout)
  out:
        return timeout < 0 ? 0 : timeout;
 }
-
 EXPORT_SYMBOL(schedule_timeout);
 
+/*
+ * We can use __set_current_state() here because schedule_timeout() calls
+ * schedule() unconditionally.
+ */
+signed long __sched schedule_timeout_interruptible(signed long timeout)
+{
+       __set_current_state(TASK_INTERRUPTIBLE);
+       return schedule_timeout(timeout);
+}
+EXPORT_SYMBOL(schedule_timeout_interruptible);
+
+signed long __sched schedule_timeout_uninterruptible(signed long timeout)
+{
+       __set_current_state(TASK_UNINTERRUPTIBLE);
+       return schedule_timeout(timeout);
+}
+EXPORT_SYMBOL(schedule_timeout_uninterruptible);
+
 /* Thread ID - the internal kernel "pid" */
 asmlinkage long sys_gettid(void)
 {
@@ -1170,8 +1196,7 @@ 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) {
@@ -1199,8 +1224,7 @@ 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) {
@@ -1598,10 +1622,8 @@ 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);
@@ -1614,10 +1636,8 @@ 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);
 }