[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>
diff --git a/kernel/timer.c b/kernel/timer.c
index fc6646f..8256f3f 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -489,9 +489,21 @@
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 @@
}
}
spin_unlock(&base->t_base.lock);
+
+ if (time_before(hr_expires, expires))
+ return hr_expires;
+
return expires;
}
#endif