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authorYong Zhang <yong.zhang@windriver.com>2010-10-20 15:57:31 -0700
committerThomas Gleixner <tglx@linutronix.de>2010-10-22 14:46:25 +0200
commit6f1bc451e6a79470b122a37ee1fc6bbca450f444 (patch)
treeb4393f6130ae3a9075de509a0e0e9328f3bd3430
parent20f33a03f0cf87e51165f7084f697acfb68e865b (diff)
timer: Make try_to_del_timer_sync() the same on SMP and UP
On UP try_to_del_timer_sync() is mapped to del_timer() which does not take the running timer callback into account, so it has different semantics. Remove the SMP dependency of try_to_del_timer_sync() by using base->running_timer in the UP case as well. [ tglx: Removed set_running_timer() inline and tweaked the changelog ] Signed-off-by: Yong Zhang <yong.zhang0@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Acked-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--include/linux/timer.h4
-rw-r--r--kernel/timer.c17
2 files changed, 5 insertions, 16 deletions
diff --git a/include/linux/timer.h b/include/linux/timer.h
index cbfb7a355d3..6abd9138bed 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -274,11 +274,11 @@ static inline void timer_stats_timer_clear_start_info(struct timer_list *timer)
extern void add_timer(struct timer_list *timer);
+extern int try_to_del_timer_sync(struct timer_list *timer);
+
#ifdef CONFIG_SMP
- extern int try_to_del_timer_sync(struct timer_list *timer);
extern int del_timer_sync(struct timer_list *timer);
#else
-# define try_to_del_timer_sync(t) del_timer(t)
# define del_timer_sync(t) del_timer(t)
#endif
diff --git a/kernel/timer.c b/kernel/timer.c
index 72853b256ff..47b86c1e322 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -330,15 +330,6 @@ void set_timer_slack(struct timer_list *timer, int slack_hz)
}
EXPORT_SYMBOL_GPL(set_timer_slack);
-
-static inline void set_running_timer(struct tvec_base *base,
- struct timer_list *timer)
-{
-#ifdef CONFIG_SMP
- base->running_timer = timer;
-#endif
-}
-
static void internal_add_timer(struct tvec_base *base, struct timer_list *timer)
{
unsigned long expires = timer->expires;
@@ -923,15 +914,12 @@ int del_timer(struct timer_list *timer)
}
EXPORT_SYMBOL(del_timer);
-#ifdef CONFIG_SMP
/**
* try_to_del_timer_sync - Try to deactivate a timer
* @timer: timer do del
*
* This function tries to deactivate a timer. Upon successful (ret >= 0)
* exit the timer is not queued and the handler is not running on any CPU.
- *
- * It must not be called from interrupt contexts.
*/
int try_to_del_timer_sync(struct timer_list *timer)
{
@@ -960,6 +948,7 @@ out:
}
EXPORT_SYMBOL(try_to_del_timer_sync);
+#ifdef CONFIG_SMP
/**
* del_timer_sync - deactivate a timer and wait for the handler to finish.
* @timer: the timer to be deactivated
@@ -1098,7 +1087,7 @@ static inline void __run_timers(struct tvec_base *base)
timer_stats_account_timer(timer);
- set_running_timer(base, timer);
+ base->running_timer = timer;
detach_timer(timer, 1);
spin_unlock_irq(&base->lock);
@@ -1106,7 +1095,7 @@ static inline void __run_timers(struct tvec_base *base)
spin_lock_irq(&base->lock);
}
}
- set_running_timer(base, NULL);
+ base->running_timer = NULL;
spin_unlock_irq(&base->lock);
}