From: Daniel Walker <dwalker@mvista.com>
To: linux-kernel@vger.kernel.org
Subject: [PATCH 09/12] clocksource: initialize list value
Date: Mon, 22 Jan 2007 21:53:04 -0800 [thread overview]
Message-ID: <20070123055347.343994209@mvista.com> (raw)
In-Reply-To: 20070123055255.338254780@mvista.com
[-- Attachment #1: clocksource_list_init.patch --]
[-- Type: text/plain, Size: 1666 bytes --]
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@mvista.com>
---
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)
--
next prev parent reply other threads:[~2007-01-23 5:54 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-23 5:52 [PATCH 00/12] clocksource/timekeeping cleanup Daniel Walker
2007-01-23 5:52 ` [PATCH 01/12] timekeeping: create kernel/time/timekeeping.c Daniel Walker
2007-01-23 5:52 ` [PATCH 02/12] clocksource: rating sorted list Daniel Walker
2007-01-23 5:52 ` [PATCH 03/12] clocksource: arm initialize list value Daniel Walker
2007-01-23 5:52 ` [PATCH 04/12] clocksource: avr32 " Daniel Walker
2007-01-23 12:42 ` Haavard Skinnemoen
2007-01-23 13:02 ` Daniel Walker
2007-01-23 13:44 ` Haavard Skinnemoen
2007-01-23 5:53 ` [PATCH 05/12] clocksource: mips " Daniel Walker
2007-01-23 5:53 ` [PATCH 06/12] clocksource: i386 " Daniel Walker
2007-01-23 5:53 ` [PATCH 07/12] clocksource: x86_64 " Daniel Walker
2007-01-23 5:53 ` [PATCH 08/12] clocksource: driver " Daniel Walker
2007-01-23 5:53 ` Daniel Walker [this message]
2007-01-23 5:53 ` [PATCH 10/12] clocksource: add block notifier Daniel Walker
2007-01-23 5:53 ` [PATCH 11/12] clocksource: remove update_callback Daniel Walker
2007-01-23 5:53 ` [PATCH 12/12] clocksource: atomic signals Daniel Walker
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