[PATCH] fix next_timer_interrupt() for hrtimer

Also from Thomas Gleixner <tglx@linutronix.de>

Function next_timer_interrupt() got broken with a recent patch
6ba1b91213e81aa92b5cf7539f7d2a94ff54947c as sys_nanosleep() was moved to
hrtimer.  This broke things as next_timer_interrupt() did not check hrtimer
tree for next event.

Function next_timer_interrupt() is needed with dyntick (CONFIG_NO_IDLE_HZ,
VST) implementations, as the system can be in idle when next hrtimer event
was supposed to happen.  At least ARM and S390 currently use
next_timer_interrupt().

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 51 insertions, 0 deletions

diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 5ae51f1bc7c8..14bc9cfa6399 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -505,6 +505,41 @@ ktime_t hrtimer_get_remaining(const struct hrtimer *timer)
         return rem;
 }
 
+#ifdef CONFIG_NO_IDLE_HZ
+/**
+ * hrtimer_get_next_event - get the time until next expiry event
+ *
+ * Returns the delta to the next expiry event or KTIME_MAX if no timer
+ * is pending.
+ */
+ktime_t hrtimer_get_next_event(void)
+{
+        struct hrtimer_base *base = __get_cpu_var(hrtimer_bases);
+        ktime_t delta, mindelta = { .tv64 = KTIME_MAX };
+        unsigned long flags;
+        int i;
+
+        for (i = 0; i < MAX_HRTIMER_BASES; i++, base++) {
+                struct hrtimer *timer;
+
+                spin_lock_irqsave(&base->lock, flags);
+                if (!base->first) {
+                        spin_unlock_irqrestore(&base->lock, flags);
+                        continue;
+                }
+                timer = rb_entry(base->first, struct hrtimer, node);
+                delta.tv64 = timer->expires.tv64;
+                spin_unlock_irqrestore(&base->lock, flags);
+                delta = ktime_sub(delta, base->get_time());
+                if (delta.tv64 < mindelta.tv64)
+                        mindelta.tv64 = delta.tv64;
+        }
+        if (mindelta.tv64 < 0)
+                mindelta.tv64 = 0;
+        return mindelta;
+}
+#endif
+
 /**
  * hrtimer_init - initialize a timer to the given clock
  *
diff --git a/kernel/timer.c b/kernel/timer.c
index fc6646fd5aab..8256f3f5ec0d 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -489,9 +489,21 @@ unsigned long next_timer_interrupt(void)
         struct list_head *list;
         struct timer_list *nte;
         unsigned long expires;
+        unsigned long hr_expires = MAX_JIFFY_OFFSET;
+        ktime_t hr_delta;
         tvec_t *varray[4];
         int i, j;
 
+        hr_delta = hrtimer_get_next_event();
+        if (hr_delta.tv64 != KTIME_MAX) {
+                struct timespec tsdelta;
+                tsdelta = ktime_to_timespec(hr_delta);
+                hr_expires = timespec_to_jiffies(&tsdelta);
+                if (hr_expires < 3)
+                        return hr_expires + jiffies;
+        }
+        hr_expires += jiffies;
+
         base = &__get_cpu_var(tvec_bases);
         spin_lock(&base->t_base.lock);
         expires = base->timer_jiffies + (LONG_MAX >> 1);
@@ -542,6 +554,10 @@ found:
                 }
         }
         spin_unlock(&base->t_base.lock);
+
+        if (time_before(hr_expires, expires))
+                return hr_expires;
+
         return expires;
 }
 #endif