linux-kernel - [PATCH 02/18] provide xtime_update() which does not require holding xtime_lock like do

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Message-Id: <1295651224-29823-3-git-send-email-torbenh@gmx.de>
Date:	Sat, 22 Jan 2011 00:06:48 +0100
From:	Torben Hohn <torbenh@....de>
To:	linux-kernel@...r.kernel.org
Cc:	tglx@...utronix.de, johnstul@...ibm.com, hch@...radead.org,
	yong.zhang0@...il.com, Torben Hohn <torbenh@....de>
Subject: [PATCH 02/18] provide xtime_update() which does not require holding xtime_lock like do_timer()

some arch code failed to lock the xtime_lock.
and some code looks like its using the xtime_lock to protect
other stuff.

this prepares the cleanup of this code.

Signed-off-by: Torben Hohn <torbenh@....de>
---
 include/linux/sched.h     |    1 +
 kernel/time/timekeeping.c |    9 +++++++++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index d747f94..9d9a078 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2050,6 +2050,7 @@ extern void release_uids(struct user_namespace *ns);
 #include <asm/current.h>
 
 extern void do_timer(unsigned long ticks);
+extern void xtime_update(unsigned long ticks);
 
 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
 extern int wake_up_process(struct task_struct *tsk);
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 546d82f..2deef94 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -958,3 +958,12 @@ void do_timer(unsigned long ticks)
 	update_wall_time();
 	calc_global_load(ticks);
 }
+
+/* xtime_update - updates the timer infrastructure.
+ */
+void xtime_update(unsigned long ticks)
+{
+	write_seqlock(&xtime_lock);
+	do_timer(ticks);
+	write_sequnlock(&xtime_lock);
+}
-- 
1.7.2.3

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