linux-kernel - [PATCH 1/2] cpuidle: Clean up fallback handling in cpuidle_idle

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Date:	Mon, 02 Mar 2015 15:51:35 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"preeti@...ux.vnet.ibm.com" <preeti@...ux.vnet.ibm.com>
Subject: [PATCH 1/2] cpuidle: Clean up fallback handling in cpuidle_idle_call()

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Move the fallback code path in cpuidle_idle_call() to the end of the
function to avoid jumping to a label in a an if () branch.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 kernel/sched/idle.c |   29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

Index: linux-pm/kernel/sched/idle.c
===================================================================
--- linux-pm.orig/kernel/sched/idle.c
+++ linux-pm/kernel/sched/idle.c
@@ -124,20 +124,8 @@ static void cpuidle_idle_call(void)
 	 * Fall back to the default arch idle method on errors.
 	 */
 	next_state = cpuidle_select(drv, dev);
-	if (next_state < 0) {
-use_default:
-		/*
-		 * We can't use the cpuidle framework, let's use the default
-		 * idle routine.
-		 */
-		if (current_clr_polling_and_test())
-			local_irq_enable();
-		else
-			arch_cpu_idle();
-
-		goto exit_idle;
-	}
-
+	if (next_state < 0)
+		goto use_default;
 
 	/*
 	 * The idle task must be scheduled, it is pointless to
@@ -195,6 +183,19 @@ exit_idle:
 
 	rcu_idle_exit();
 	start_critical_timings();
+	return;
+
+use_default:
+	/*
+	 * We can't use the cpuidle framework, let's use the default
+	 * idle routine.
+	 */
+	if (current_clr_polling_and_test())
+		local_irq_enable();
+	else
+		arch_cpu_idle();
+
+	goto exit_idle;
 }
 
 /*

--
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