Merge branch 'e1000' of ssh://198.78.49.142/srv/git/intel/linux-2.6

[linux-2.6] / kernel / timer.c

diff --git a/kernel/timer.c b/kernel/timer.c
index 80bf2acf6b08996944fdfc6c07dd542528fd93bc..fe3a9a9f832849bddbb3bf1be92268af99287aa9 100644 (file)
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -495,7 +495,7 @@ unsigned long next_timer_interrupt(void)
        base = &__get_cpu_var(tvec_bases);
        spin_lock(&base->t_base.lock);
        expires = base->timer_jiffies + (LONG_MAX >> 1);
-       list = 0;
+       list = NULL;
 
        /* Look for timer events in tv1. */
        j = base->timer_jiffies & TVR_MASK;
@@ -717,12 +717,16 @@ static void second_overflow(void)
 #endif
 }
 
-/* in the NTP reference this is called "hardclock()" */
-static void update_wall_time_one_tick(void)
+/*
+ * Returns how many microseconds we need to add to xtime this tick
+ * in doing an adjustment requested with adjtime.
+ */
+static long adjtime_adjustment(void)
 {
-       long time_adjust_step, delta_nsec;
+       long time_adjust_step;
 
-       if ((time_adjust_step = time_adjust) != 0 ) {
+       time_adjust_step = time_adjust;
+       if (time_adjust_step) {
                /*
                 * We are doing an adjtime thing.  Prepare time_adjust_step to
                 * be within bounds.  Note that a positive time_adjust means we
@@ -733,10 +737,19 @@ static void update_wall_time_one_tick(void)
                 */
                time_adjust_step = min(time_adjust_step, (long)tickadj);
                time_adjust_step = max(time_adjust_step, (long)-tickadj);
+       }
+       return time_adjust_step;
+}
 
+/* in the NTP reference this is called "hardclock()" */
+static void update_wall_time_one_tick(void)
+{
+       long time_adjust_step, delta_nsec;
+
+       time_adjust_step = adjtime_adjustment();
+       if (time_adjust_step)
                /* Reduce by this step the amount of time left  */
                time_adjust -= time_adjust_step;
-       }
        delta_nsec = tick_nsec + time_adjust_step * 1000;
        /*
         * Advance the phase, once it gets to one microsecond, then
@@ -758,6 +771,22 @@ static void update_wall_time_one_tick(void)
        }
 }
 
+/*
+ * Return how long ticks are at the moment, that is, how much time
+ * update_wall_time_one_tick will add to xtime next time we call it
+ * (assuming no calls to do_adjtimex in the meantime).
+ * The return value is in fixed-point nanoseconds with SHIFT_SCALE-10
+ * bits to the right of the binary point.
+ * This function has no side-effects.
+ */
+u64 current_tick_length(void)
+{
+       long delta_nsec;
+
+       delta_nsec = tick_nsec + adjtime_adjustment() * 1000;
+       return ((u64) delta_nsec << (SHIFT_SCALE - 10)) + time_adj;
+}
+
 /*
  * Using a loop looks inefficient, but "ticks" is
  * usually just one (we shouldn't be losing ticks,
@@ -1120,62 +1149,6 @@ 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
  */