linux-kernel - [tip:timers/urgent] hrtimer: Avoid double seqlock

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Date:	Wed, 26 May 2010 14:19:08 GMT
From:	tip-bot for Stanislaw Gruszka <stf_xl@...pl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	stf_xl@...pl, tglx@...utronix.de
Subject: [tip:timers/urgent] hrtimer: Avoid double seqlock

Commit-ID:  174bd1994ec67a6e6191c4ed8e5dac17fa221b84
Gitweb:     http://git.kernel.org/tip/174bd1994ec67a6e6191c4ed8e5dac17fa221b84
Author:     Stanislaw Gruszka <stf_xl@...pl>
AuthorDate: Tue, 25 May 2010 23:49:12 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 26 May 2010 16:15:37 +0200

hrtimer: Avoid double seqlock

hrtimer_get_softirq_time() has it's own xtime lock protection, so it's
safe to use plain __current_kernel_time() and avoid the double seqlock
loop.

Signed-off-by: Stanislaw Gruszka <stf_xl@...pl>
LKML-Reference: <20100525214912.GA1934@...h72.net.upc.cz>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 kernel/hrtimer.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index b9b134b..5c69e99 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -89,7 +89,7 @@ static void hrtimer_get_softirq_time(struct hrtimer_cpu_base *base)
 
 	do {
 		seq = read_seqbegin(&xtime_lock);
-		xts = current_kernel_time();
+		xts = __current_kernel_time();
 		tom = wall_to_monotonic;
 	} while (read_seqretry(&xtime_lock, seq));
 
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