[PATCH] i386: Don't touch per cpu memory of offline CPUs 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@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>

diff --git a/arch/i386/kernel/nmi.c b/arch/i386/kernel/nmi.c
index 171194c..f5bc7e1 100644 (file)
--- a/arch/i386/kernel/nmi.c
+++ b/arch/i386/kernel/nmi.c
@@ -870,14 +870,16 @@ 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: