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-rw-r--r--kernel/hrtimer.c20
1 files changed, 14 insertions, 6 deletions
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index a2310d1bebe1..e04ef38ea3be 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -2,8 +2,8 @@
* linux/kernel/hrtimer.c
*
* Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
- * Copyright(C) 2005-2006, Red Hat, Inc., Ingo Molnar
- * Copyright(C) 2006 Timesys Corp., Thomas Gleixner <tglx@timesys.com>
+ * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar
+ * Copyright(C) 2006-2007 Timesys Corp., Thomas Gleixner <tglx@timesys.com>
*
* High-resolution kernel timers
*
@@ -38,6 +38,7 @@
#include <linux/notifier.h>
#include <linux/syscalls.h>
#include <linux/interrupt.h>
+#include <linux/tick.h>
#include <asm/uaccess.h>
@@ -288,7 +289,7 @@ ktime_t ktime_add_ns(const ktime_t kt, u64 nsec)
/*
* Divide a ktime value by a nanosecond value
*/
-static unsigned long ktime_divns(const ktime_t kt, s64 div)
+unsigned long ktime_divns(const ktime_t kt, s64 div)
{
u64 dclc, inc, dns;
int sft = 0;
@@ -305,9 +306,6 @@ static unsigned long ktime_divns(const ktime_t kt, s64 div)
return (unsigned long) dclc;
}
-
-#else /* BITS_PER_LONG < 64 */
-# define ktime_divns(kt, div) (unsigned long)((kt).tv64 / (div))
#endif /* BITS_PER_LONG >= 64 */
/*
@@ -682,6 +680,16 @@ void hrtimer_run_queues(void)
struct hrtimer_cpu_base *cpu_base = &__get_cpu_var(hrtimer_bases);
int i;
+ /*
+ * This _is_ ugly: We have to check in the softirq context,
+ * whether we can switch to highres and / or nohz mode. The
+ * clocksource switch happens in the timer interrupt with
+ * xtime_lock held. Notification from there only sets the
+ * check bit in the tick_oneshot code, otherwise we might
+ * deadlock vs. xtime_lock.
+ */
+ tick_check_oneshot_change(1);
+
hrtimer_get_softirq_time(cpu_base);
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++)