1 files changed, 5 insertions, 1 deletions

diff --git a/kernel/itimer.c b/kernel/itimer.c
index e9a40e947e07..1dc988e0d2c7 100644
--- a/kernel/itimer.c
+++ b/kernel/itimer.c
@@ -123,7 +123,11 @@ static inline void it_real_arm(struct task_struct *p, unsigned long interval)
                 return;
         if (interval > (unsigned long) LONG_MAX)
                 interval = LONG_MAX;
-        p->signal->real_timer.expires = jiffies + interval;
+        /* the "+ 1" below makes sure that the timer doesn't go off before
+         * the interval requested. This could happen if
+         * time requested % (usecs per jiffy) is more than the usecs left
+         * in the current jiffy */
+        p->signal->real_timer.expires = jiffies + interval + 1;
         add_timer(&p->signal->real_timer);
 }