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[1/6] timer: add on-stack deferrable timer interfaces

Message ID d5fb8e8eb2d9082e0180633dc273ddecfb7ff161.1282089274.git.leann.ogasawara@canonical.com
State Accepted
Delegated to: Leann Ogasawara
Headers show

Commit Message

Leann Ogasawara Aug. 18, 2010, 1:27 a.m. UTC 
BugLink: http://bugs.launchpad.net/bugs/601057

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>
(cherry picked from commit 8cadd2831bf3abc94f4530e7fdbab7bb39b6b27d)

Signed-off-by: Leann Ogasawara <leann.ogasawara@canonical.com>
---
 include/linux/timer.h |   15 +++++++++++++++
 kernel/timer.c        |   13 +++++++++++++
 2 files changed, 28 insertions(+), 0 deletions(-)
diff mbox

Patch

diff --git a/include/linux/timer.h b/include/linux/timer.h
index ea965b8..38cf093 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -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
diff --git a/kernel/timer.c b/kernel/timer.c
index ee305c8..efde11e 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -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