clockevents: warn once when program_event() is called with negative expiry

[linux-2.6] / kernel / hrtimer.c

diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index b6d2ff7e37ee280d266ecc98ed63cb2d8f48d0f9..e65dd0b47cdc13a31abc762315152cb49edea8d8 100644 (file)
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -602,7 +602,7 @@ static int hrtimer_switch_to_hres(void)
        /* "Retrigger" the interrupt to get things going */
        retrigger_next_event(NULL);
        local_irq_restore(flags);
-       printk(KERN_INFO "Switched to high resolution mode on CPU %d\n",
+       printk(KERN_DEBUG "Switched to high resolution mode on CPU %d\n",
               smp_processor_id());
        return 1;
 }
@@ -850,6 +850,14 @@ hrtimer_start(struct hrtimer *timer, ktime_t tim, const enum hrtimer_mode mode)
 #ifdef CONFIG_TIME_LOW_RES
                tim = ktime_add(tim, base->resolution);
 #endif
+               /*
+                * Careful here: User space might have asked for a
+                * very long sleep, so the add above might result in a
+                * negative number, which enqueues the timer in front
+                * of the queue.
+                */
+               if (tim.tv64 < 0)
+                       tim.tv64 = KTIME_MAX;
        }
        timer->expires = tim;