[PATCH] Represent laptop_mode as jiffies internally

Make that the internal value for /proc/sys/vm/laptop_mode is stored as
jiffies instead of seconds.  Let the sysctl interface do the conversions,
instead of doing on-the-fly conversions every time the value is used.

Add a description of the fact that laptop_mode doubles as a flag and a
timeout to the comment above the laptop_mode variable.

Signed-off-by: Bart Samwel <bart@samwel.tk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index e79107991d20..c1052ee79f01 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -88,7 +88,8 @@ int dirty_expire_interval = 30 * HZ;
 int block_dump;
 
 /*
- * Flag that puts the machine in "laptop mode".
+ * Flag that puts the machine in "laptop mode". Doubles as a timeout in jiffies:
+ * a full sync is triggered after this time elapses without any disk activity.
  */
 int laptop_mode;
 
@@ -468,7 +469,7 @@ static void laptop_timer_fn(unsigned long unused)
  */
 void laptop_io_completion(void)
 {
-        mod_timer(&laptop_mode_wb_timer, jiffies + laptop_mode * HZ);
+        mod_timer(&laptop_mode_wb_timer, jiffies + laptop_mode);
 }
 
 /*