diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2007-02-16 01:27:47 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-16 08:13:58 -0800 |
| commit | fd064b9b7770d5c7705bf9542950c7bd81c30f98 (patch) | |
| tree | 8b14c81f983e49b5553fd6764139bffb1d4f1648 /include/linux/timer.h | |
| parent | 1cfd68496e53f7be09a3c1358d1d389004217541 (diff) | |
| download | linux-fd064b9b7770d5c7705bf9542950c7bd81c30f98.tar.gz linux-fd064b9b7770d5c7705bf9542950c7bd81c30f98.tar.bz2 linux-fd064b9b7770d5c7705bf9542950c7bd81c30f98.zip | |
[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 <cotte@de.ibm.com> ]
[ made new helper static, Adrian Bunk <bunk@stusta.de> ]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/timer.h')
| -rw-r--r-- | include/linux/timer.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/timer.h b/include/linux/timer.h index fb5edaaf0ebd..bd0af324fd48 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 |