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-rw-r--r--kernel/itimer.c6
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);
}