linux-kernel - [PATCH v2 1/3] timekeeping: moving xtime's init to a later time

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Date:	Thu, 15 Jul 2010 16:23:29 +0800
From:	feng.tang@...el.com
To:	linux-kernel@...r.kernel.org
Cc:	Feng Tang <feng.tang@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <johnstul@...ibm.com>
Subject: [PATCH v2 1/3] timekeeping: moving xtime's init to a later time

From: Feng Tang <feng.tang@...el.com>

xtime doesn't need to be inited early, move it to a subsys_initcall,
as most of its consumers come from userspace. It will also give enough
time for some MMIO based wallclock devices to init

Signed-off-by: Feng Tang <feng.tang@...el.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: John Stultz <johnstul@...ibm.com>
---
 kernel/time/timekeeping.c |   28 +++++++++++++++++++++-------
 1 files changed, 21 insertions(+), 7 deletions(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index caf8d4d..0803a76 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -520,26 +520,37 @@ void __attribute__((weak)) read_boot_clock(struct timespec *ts)
 }
 
 /*
- * timekeeping_init - Initializes the clocksource and common timekeeping values
+ * timekeeping_init - Initializes the clocksource
  */
 void __init timekeeping_init(void)
 {
 	struct clocksource *clock;
 	unsigned long flags;
-	struct timespec now, boot;
-
-	read_persistent_clock(&now);
-	read_boot_clock(&boot);
 
 	write_seqlock_irqsave(&xtime_lock, flags);
 
-	ntp_init();
-
 	clock = clocksource_default_clock();
 	if (clock->enable)
 		clock->enable(clock);
 	timekeeper_setup_internals(clock);
 
+	ntp_init();
+	write_sequnlock_irqrestore(&xtime_lock, flags);
+}
+
+/*
+ *  timekeeping_late_init - Initaizes the common timekeeping values
+ */
+static int __init timekeeping_late_init(void)
+{
+	unsigned long flags;
+	struct timespec now, boot;
+
+	read_persistent_clock(&now);
+	read_boot_clock(&boot);
+
+	write_seqlock_irqsave(&xtime_lock, flags);
+
 	xtime.tv_sec = now.tv_sec;
 	xtime.tv_nsec = now.tv_nsec;
 	raw_time.tv_sec = 0;
@@ -553,7 +564,10 @@ void __init timekeeping_init(void)
 	total_sleep_time.tv_sec = 0;
 	total_sleep_time.tv_nsec = 0;
 	write_sequnlock_irqrestore(&xtime_lock, flags);
+
+	return 0;
 }
+subsys_initcall(timekeeping_late_init);
 
 /* time in seconds when suspend began */
 static struct timespec timekeeping_suspend_time;
-- 
1.7.0.4

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