linux-kernel - [PATCH tip/core/rcu 10/14] rcu: split 'rcuboost' to each flavor

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Date:	Tue, 30 Oct 2012 10:05:09 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, edumazet@...gle.com, darren@...art.com,
	fweisbec@...il.com, sbw@....edu, patches@...aro.org,
	Michael Wang <wangyun@...ux.vnet.ibm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 10/14] rcu: split 'rcuboost' to each flavor

From: Michael Wang <wangyun@...ux.vnet.ibm.com>

This patch add new 'rcuboost' to each flavor's folder, now we could use:
	'cat /debugfs/rcu/rsp/rcuboost'
to get the selected rsp info.

Signed-off-by: Michael Wang <wangyun@...ux.vnet.ibm.com>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcutree_trace.c |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/kernel/rcutree_trace.c b/kernel/rcutree_trace.c
index 8b03bfb..b6fd147 100644
--- a/kernel/rcutree_trace.c
+++ b/kernel/rcutree_trace.c
@@ -239,7 +239,7 @@ static const struct file_operations rcu_node_boost_fops = {
 	.owner = THIS_MODULE,
 	.open = rcu_node_boost_open,
 	.read = seq_read,
-	.llseek = seq_lseek,
+	.llseek = no_llseek,
 	.release = single_release,
 };
 
@@ -456,6 +456,15 @@ static int __init rcutree_trace_init(void)
 					rspdir, rsp, &new_rcubarrier_fops);
 			if (!retval)
 				goto free_out;
+
+#ifdef CONFIG_RCU_BOOST
+			if (rsp == &rcu_preempt_state) {
+				retval = debugfs_create_file("rcuboost", 0444,
+					rspdir, NULL, &rcu_node_boost_fops);
+				if (!retval)
+					goto free_out;
+			}
+#endif
 	}
 
 	retval = debugfs_create_file("rcubarrier", 0444, rcudir,
-- 
1.7.8

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