linux-kernel - [PATCH] i386: conditionalize touching of memory in touch_nmi

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Date:	Wed, 15 Nov 2006 14:57:32 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] i386: conditionalize touching of memory in
	touch_nmi_watchdog()

Just like on x86-64, don't touch foreign CPUs' memory if the watchdog
isn't enabled at all.

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

--- linux-2.6.19-rc5/arch/i386/kernel/nmi.c	2006-11-08 09:21:37.000000000 +0100
+++ 2.6.19-rc5-i386-touch_nmi_watchdog/arch/i386/kernel/nmi.c	2006-11-06 09:10:16.000000000 +0100
@@ -867,14 +867,16 @@ static unsigned int
 
 void touch_nmi_watchdog (void)
 {
-	int i;
+	if (nmi_watchdog > 0) {
+		unsigned cpu;
 
-	/*
-	 * Just reset the alert counters, (other CPUs might be
-	 * spinning on locks we hold):
-	 */
-	for_each_possible_cpu(i)
-		alert_counter[i] = 0;
+		/*
+		 * Just reset the alert counters, (other CPUs might be
+		 * spinning on locks we hold):
+		 */
+		for_each_present_cpu (cpu)
+			alert_counter[cpu] = 0;
+	}
 
 	/*
 	 * Tickle the softlockup detector too:


-
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