linux-kernel - [PATCH] x86, UV: remove recursion in uv_heartbeat

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Date:	Thu, 07 Jan 2010 15:35:42 +0100
From:	Roel Kluin <roel.kluin@...il.com>
To:	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86, UV: remove recursion in uv_heartbeat_enable()

The recursion is not needed and does not improve readability.

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
 arch/x86/kernel/apic/x2apic_uv_x.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 8edb27c..fcc3f4a 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -473,7 +473,7 @@ static void uv_heartbeat(unsigned long ignored)
 
 static void __cpuinit uv_heartbeat_enable(int cpu)
 {
-	if (!uv_cpu_hub_info(cpu)->scir.enabled) {
+	while (!uv_cpu_hub_info(cpu)->scir.enabled) {
 		struct timer_list *timer = &uv_cpu_hub_info(cpu)->scir.timer;
 
 		uv_set_cpu_scir_bits(cpu, SCIR_CPU_HEARTBEAT|SCIR_CPU_ACTIVITY);
@@ -481,11 +481,10 @@ static void __cpuinit uv_heartbeat_enable(int cpu)
 		timer->expires = jiffies + SCIR_CPU_HB_INTERVAL;
 		add_timer_on(timer, cpu);
 		uv_cpu_hub_info(cpu)->scir.enabled = 1;
-	}
 
-	/* check boot cpu */
-	if (!uv_cpu_hub_info(0)->scir.enabled)
-		uv_heartbeat_enable(0);
+		/* also ensure that boot cpu is enabled */
+		cpu = 0;
+	}
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
--
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