In some cases (for instance with kernel threads) it may be desireable to
use on-stack deferrable timers to get their power saving benefits. Add
interfaces to support this for the IPS driver.
Signed-off-by: Jesse Barnes <jbar...@virtuousgeek.org>
---
include/linux/timer.h | 15 +++++++++++++++
kernel/timer.c | 13 +++++++++++++
2 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/include/linux/timer.h b/include/linux/timer.h
index a2d1eb6..b9bc8e1 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -94,6 +94,13 @@ void init_timer_deferrable_key(struct timer_list *timer,
setup_timer_on_stack_key((timer), #timer, &__key, \
(fn), (data)); \
} while (0)
+#define setup_deferrable_timer_on_stack(timer, fn, data) \
+ do { \
+ static struct lock_class_key __key; \
+ setup_deferrable_timer_on_stack_key((timer), #timer, \
+ &__key, (fn), \
+ (data)); \
+ } while (0)
#else
#define init_timer(timer)\
init_timer_key((timer), NULL, NULL)
@@ -105,6 +112,8 @@ void init_timer_deferrable_key(struct timer_list *timer,
setup_timer_key((timer), NULL, NULL, (fn), (data))
#define setup_timer_on_stack(timer, fn, data)\
setup_timer_on_stack_key((timer), NULL, NULL, (fn), (data))
+#define setup_deferrable_timer_on_stack(timer, fn, data)\
+ setup_deferrable_timer_on_stack_key((timer), NULL, NULL, (fn), (data))
#endif
#ifdef CONFIG_DEBUG_OBJECTS_TIMERS
@@ -144,6 +153,12 @@ static inline void setup_timer_on_stack_key(struct
timer_list *timer,
init_timer_on_stack_key(timer, name, key);
}
+extern void setup_deferrable_timer_on_stack_key(struct timer_list *timer,
+ const char *name,
+ struct lock_class_key *key,
+ void (*function)(unsigned long),
+ unsigned long data);
+
/**
* timer_pending - is a timer pending?
* @timer: the timer in question
diff --git a/kernel/timer.c b/kernel/timer.c
index c61a794..a7b964a 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -557,6 +557,19 @@ static void __init_timer(struct timer_list *timer,
lockdep_init_map(&timer->lockdep_map, name, key, 0);
}
+void setup_deferrable_timer_on_stack_key(struct timer_list *timer,
+ const char *name,
+ struct lock_class_key *key,
+ void (*function)(unsigned long),
+ unsigned long data)
+{
+ timer->function = function;
+ timer->data = data;
+ init_timer_on_stack_key(timer, name, key);
+ timer_set_deferrable(timer);
+}
+EXPORT_SYMBOL_GPL(setup_deferrable_timer_on_stack_key);
+
/**
* init_timer_key - initialize a timer
* @timer: the timer to be initialized
--
1.7.0.1
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