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timer: add on-stack deferrable timer interfaces

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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 <jbarnes@virtuousgeek.org>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Jesse Barnes 2010-05-10 14:26:20 -07:00 committed by Matthew Garrett
parent 81f61484f1
commit 8cadd2831b
2 changed files with 28 additions and 0 deletions
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15
include/linux/timer.h
View File

@ -100,6 +100,13 @@ 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)
@ -111,6 +118,8 @@ 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
@ -150,6 +159,12 @@ 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

13
kernel/timer.c
View File

@ -577,6 +577,19 @@ 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