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[PATCH] x86_64: make touch_nmi_watchdog() not touch impossible cpus' private data

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Along with that, also suppress the memory touching altogether when the
watchdog is not running, to eliminate needless crosstalk. Plus ad a call
to it to make things consistent (one could also consider removing the call
in enable_timer_nmi_watchdog()).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jan Beulich 2006-02-16 23:41:55 +01:00 committed by Linus Torvalds
parent e4444d1a30
commit 99019e9199
1 changed files with 11 additions and 8 deletions
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19
arch/x86_64/kernel/nmi.c
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@ -236,6 +236,7 @@ static void enable_lapic_nmi_watchdog(void)
{
if (nmi_active < 0) {
nmi_watchdog = NMI_LOCAL_APIC;
touch_nmi_watchdog();
setup_apic_nmi_watchdog();
}
}
@ -456,15 +457,17 @@ static DEFINE_PER_CPU(int, nmi_touch);
void touch_nmi_watchdog (void)
{
int i;
if (nmi_watchdog > 0) {
unsigned cpu;
/*
* Tell other CPUs to reset their alert counters. We cannot
* do it ourselves because the alert count increase is not
* atomic.
*/
for (i = 0; i < NR_CPUS; i++)
per_cpu(nmi_touch, i) = 1;
/*
* Tell other CPUs to reset their alert counters. We cannot
* do it ourselves because the alert count increase is not
* atomic.
*/
for_each_present_cpu (cpu)
per_cpu(nmi_touch, cpu) = 1;
}
touch_softlockup_watchdog();
}