linux-kernel - [PATCH 1/2] softlockup: convert read_lock in hung_task to rcu_read

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Date:	Fri, 30 Jan 2009 12:46:41 -0800
From:	Mandeep Singh Baines <msb@...gle.com>
To:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Frédéric Weisbecker <fweisbec@...il.com>
Cc:	rientjes@...gle.com, mbligh@...gle.com, thockin@...gle.com,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 1/2] softlockup: convert read_lock in hung_task to rcu_read_lock

Peter Zijlstra suggested the use of RCU.

Signed-off-by: Mandeep Singh Baines <msb@...gle.com>
---
 kernel/hung_task.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index ba8ccd4..a841db3 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -127,7 +127,7 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout)
 	if (test_taint(TAINT_DIE) || did_panic)
 		return;
 
-	read_lock(&tasklist_lock);
+	rcu_read_lock();
 	do_each_thread(g, t) {
 		if (!--max_count)
 			goto unlock;
@@ -136,7 +136,7 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout)
 			check_hung_task(t, now, timeout);
 	} while_each_thread(g, t);
  unlock:
-	read_unlock(&tasklist_lock);
+	rcu_read_unlock();
 }
 
 static void update_poll_jiffies(void)
-- 
1.5.4.5

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