linux-kernel - [PATCH RFC tip/core/rcu 2/7] rcu: Irq nesting is always 0 on rcu_enter_idle

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Date:	Sat,  3 Dec 2011 10:34:37 -0800
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, eric.dumazet@...il.com, darren@...art.com,
	patches@...aro.org, Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH RFC tip/core/rcu 2/7] rcu: Irq nesting is always 0 on rcu_enter_idle_common

From: Frederic Weisbecker <fweisbec@...il.com>

Because tasks don't nest, the ->dyntick_nesting must always be zero upon
entry to rcu_idle_enter_common().  Therefore, pass "0" rather than the
counter itself.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Josh Triplett <josh@...htriplett.org>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcutree.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 860c02c..c0ed376 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -350,12 +350,11 @@ static int rcu_implicit_offline_qs(struct rcu_data *rdp)
  */
 static void rcu_idle_enter_common(struct rcu_dynticks *rdtp, long long oldval)
 {
-	trace_rcu_dyntick("Start", oldval, rdtp->dynticks_nesting);
+	trace_rcu_dyntick("Start", oldval, 0);
 	if (!is_idle_task(current)) {
 		struct task_struct *idle = idle_task(smp_processor_id());
 
-		trace_rcu_dyntick("Error on entry: not idle task",
-				   oldval, rdtp->dynticks_nesting);
+		trace_rcu_dyntick("Error on entry: not idle task", oldval, 0);
 		ftrace_dump(DUMP_ALL);
 		WARN_ONCE(1, "Current pid: %d comm: %s / Idle pid: %d comm: %s",
 			  current->pid, current->comm,
-- 
1.7.3.2

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