Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=fd064b9b7770d5c7705bf9542950c7bd81c30f98
Commit: fd064b9b7770d5c7705bf9542950c7bd81c30f98
Parent: 1cfd68496e53f7be09a3c1358d1d389004217541
Author: Thomas Gleixner <[EMAIL PROTECTED]>
AuthorDate: Fri Feb 16 01:27:47 2007 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Fri Feb 16 08:13:58 2007 -0800
[PATCH] Extend next_timer_interrupt() to use a reference jiffie
For CONFIG_NO_HZ we need to calculate the next timer wheel event based on a
given jiffie value. Extend the existing code to allow the extra 'now'
argument. Provide a compability function for the existing implementations
to
call the function with now == jiffies. (This also solves the racyness of
the
original code vs. jiffies changing during the iteration.)
No functional changes to existing users of this infrastructure.
[ remove WARN_ON() that triggered on s390, by Carsten Otte <[EMAIL
PROTECTED]> ]
[ made new helper static, Adrian Bunk <[EMAIL PROTECTED]> ]
Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
Cc: john stultz <[EMAIL PROTECTED]>
Cc: Roman Zippel <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
include/linux/timer.h | 10 ++++++++++
kernel/hrtimer.c | 2 +-
kernel/timer.c | 14 +++++++++++---
3 files changed, 22 insertions(+), 4 deletions(-)
diff --git a/include/linux/timer.h b/include/linux/timer.h
index fb5edaa..bd0af32 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -61,7 +61,17 @@ extern int del_timer(struct timer_list * timer);
extern int __mod_timer(struct timer_list *timer, unsigned long expires);
extern int mod_timer(struct timer_list *timer, unsigned long expires);
+/*
+ * Return when the next timer-wheel timeout occurs (in absolute jiffies),
+ * locks the timer base:
+ */
extern unsigned long next_timer_interrupt(void);
+/*
+ * Return when the next timer-wheel timeout occurs (in absolute jiffies),
+ * locks the timer base and does the comparison against the given
+ * jiffie.
+ */
+extern unsigned long get_next_timer_interrupt(unsigned long now);
/**
* add_timer - start a timer
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index c0fdb9b..bd57ef4 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -533,7 +533,7 @@ ktime_t hrtimer_get_remaining(const struct hrtimer *timer)
}
EXPORT_SYMBOL_GPL(hrtimer_get_remaining);
-#ifdef CONFIG_NO_IDLE_HZ
+#if defined(CONFIG_NO_IDLE_HZ) || defined(CONFIG_NO_HZ)
/**
* hrtimer_get_next_event - get the time until next expiry event
*
diff --git a/kernel/timer.c b/kernel/timer.c
index 201bee0..6d843e1 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -591,7 +591,7 @@ static inline void __run_timers(tvec_base_t *base)
spin_unlock_irq(&base->lock);
}
-#ifdef CONFIG_NO_IDLE_HZ
+#if defined(CONFIG_NO_IDLE_HZ) || defined(CONFIG_NO_HZ)
/*
* Find out when the next timer event is due to happen. This
* is used on S/390 to stop all activity when a cpus is idle.
@@ -687,10 +687,10 @@ static unsigned long cmp_next_hrtimer_event(unsigned long
now,
/**
* next_timer_interrupt - return the jiffy of the next pending timer
*/
-unsigned long next_timer_interrupt(void)
+unsigned long get_next_timer_interrupt(unsigned long now)
{
tvec_base_t *base = __get_cpu_var(tvec_bases);
- unsigned long expires, now = jiffies;
+ unsigned long expires;
spin_lock(&base->lock);
expires = __next_timer_interrupt(base);
@@ -701,6 +701,14 @@ unsigned long next_timer_interrupt(void)
return cmp_next_hrtimer_event(now, expires);
}
+
+#ifdef CONFIG_NO_IDLE_HZ
+unsigned long next_timer_interrupt(void)
+{
+ return get_next_timer_interrupt(jiffies);
+}
+#endif
+
#endif
/******************************************************************/
-
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