[PATCH 09/12] clocksource: initialize list value

[Daniel Walker]

A change to clocksource initialization. If the list field is initialized 
it allows clocksource_register to complete faster since it doesn't have 
to scan the list of clocks doing strcmp on each looking for duplicates.

Signed-Off-By: Daniel Walker <dwalker@xxxxxxxxxx>

---
 kernel/time/clocksource.c |    3 +--
 kernel/time/jiffies.c     |    1 +
 2 files changed, 2 insertions(+), 2 deletions(-)

Index: linux-2.6.19/kernel/time/clocksource.c
===================================================================
--- linux-2.6.19.orig/kernel/time/clocksource.c
+++ linux-2.6.19/kernel/time/clocksource.c
@@ -186,12 +186,11 @@ int clocksource_register(struct clocksou
 	unsigned long flags;
 
 	spin_lock_irqsave(&clocksource_lock, flags);
-	if (unlikely(!list_empty(&c->list) && __is_registered(c->name))) {
+	if (unlikely(!list_empty(&c->list))) {
 		printk("register_clocksource: Cannot register %s clocksource. "
 		       "Already registered!", c->name);
 		ret = -EBUSY;
 	} else {
-		INIT_LIST_HEAD(&c->list);
  		__sorted_list_add(c);
 		/* scan the registered clocksources, and pick the best one */
 		next_clocksource = select_clocksource();
Index: linux-2.6.19/kernel/time/jiffies.c
===================================================================
--- linux-2.6.19.orig/kernel/time/jiffies.c
+++ linux-2.6.19/kernel/time/jiffies.c
@@ -63,6 +63,7 @@ struct clocksource clocksource_jiffies =
 	.mult		= NSEC_PER_JIFFY << JIFFIES_SHIFT, /* details above */
 	.shift		= JIFFIES_SHIFT,
 	.is_continuous	= 0, /* tick based, not free running */
+	.list		= LIST_HEAD_INIT(clocksource_jiffies.list),
 };
 
 static int __init init_jiffies_clocksource(void)

-- 
-
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