mlx4_core: Support ICM tables in coherent memory

[pandora-kernel.git] / kernel / posix-timers.c

diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 588c99d..7a15afb 100644 (file)
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -241,7 +241,7 @@ static __init int init_posix_timers(void)
        register_posix_clock(CLOCK_MONOTONIC, &clock_monotonic);
 
        posix_timers_cache = kmem_cache_create("posix_timers_cache",
-                                       sizeof (struct k_itimer), 0, 0, NULL, NULL);
+                                       sizeof (struct k_itimer), 0, 0, NULL);
        idr_init(&posix_timers_id);
        return 0;
 }
@@ -353,9 +353,40 @@ static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
                 * it should be restarted.
                 */
                if (timr->it.real.interval.tv64 != 0) {
+                       ktime_t now = hrtimer_cb_get_time(timer);
+
+                       /*
+                        * FIXME: What we really want, is to stop this
+                        * timer completely and restart it in case the
+                        * SIG_IGN is removed. This is a non trivial
+                        * change which involves sighand locking
+                        * (sigh !), which we don't want to do late in
+                        * the release cycle.
+                        *
+                        * For now we just let timers with an interval
+                        * less than a jiffie expire every jiffie to
+                        * avoid softirq starvation in case of SIG_IGN
+                        * and a very small interval, which would put
+                        * the timer right back on the softirq pending
+                        * list. By moving now ahead of time we trick
+                        * hrtimer_forward() to expire the timer
+                        * later, while we still maintain the overrun
+                        * accuracy, but have some inconsistency in
+                        * the timer_gettime() case. This is at least
+                        * better than a starved softirq. A more
+                        * complex fix which solves also another related
+                        * inconsistency is already in the pipeline.
+                        */
+#ifdef CONFIG_HIGH_RES_TIMERS
+                       {
+                               ktime_t kj = ktime_set(0, NSEC_PER_SEC / HZ);
+
+                               if (timr->it.real.interval.tv64 < kj.tv64)
+                                       now = ktime_add(now, kj);
+                       }
+#endif
                        timr->it_overrun +=
-                               hrtimer_forward(timer,
-                                               hrtimer_cb_get_time(timer),
+                               hrtimer_forward(timer, now,
                                                timr->it.real.interval);
                        ret = HRTIMER_RESTART;
                        ++timr->it_requeue_pending;
@@ -516,9 +547,9 @@ sys_timer_create(const clockid_t which_clock,
                                new_timer->it_process = process;
                                list_add(&new_timer->list,
                                         &process->signal->posix_timers);
-                               spin_unlock_irqrestore(&process->sighand->siglock, flags);
                                if (new_timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
                                        get_task_struct(process);
+                               spin_unlock_irqrestore(&process->sighand->siglock, flags);
                        } else {
                                spin_unlock_irqrestore(&process->sighand->siglock, flags);
                                process = NULL;
@@ -574,13 +605,14 @@ static struct k_itimer * lock_timer(timer_t timer_id, unsigned long *flags)
        timr = (struct k_itimer *) idr_find(&posix_timers_id, (int) timer_id);
        if (timr) {
                spin_lock(&timr->it_lock);
-               spin_unlock(&idr_lock);
 
                if ((timr->it_id != timer_id) || !(timr->it_process) ||
                                timr->it_process->tgid != current->tgid) {
-                       unlock_timer(timr, *flags);
+                       spin_unlock(&timr->it_lock);
+                       spin_unlock_irqrestore(&idr_lock, *flags);
                        timr = NULL;
-               }
+               } else
+                       spin_unlock(&idr_lock);
        } else
                spin_unlock_irqrestore(&idr_lock, *flags);