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i386: fix a hang on stuck nmi watchdog

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In the case when an nmi gets stucks the endflag stays equal to zero.
This causes the busy looping on other cpus to continue, even though the
nmi test is done.

On my machine with out the change below the system would hang right
after check_nmi_watchdog().  The change below just sets endflag prior to
checking if the test was successful or not.

Signed-off-by: Daniel Walker <dwalker@mvista.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Daniel Walker 2007-09-06 16:59:54 +02:00 committed by Linus Torvalds
parent a534b67918
commit d95865480d
1 changed files with 1 additions and 1 deletions
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2
arch/i386/kernel/nmi.c
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@ -115,12 +115,12 @@ static int __init check_nmi_watchdog(void)
atomic_dec(&nmi_active); atomic_dec(&nmi_active);
} }
} }
endflag = 1;
if (!atomic_read(&nmi_active)) { if (!atomic_read(&nmi_active)) {
kfree(prev_nmi_count); kfree(prev_nmi_count);
atomic_set(&nmi_active, -1); atomic_set(&nmi_active, -1);
return -1; return -1;
} }
endflag = 1;
printk("OK.\n"); printk("OK.\n");
/* now that we know it works we can reduce NMI frequency to /* now that we know it works we can reduce NMI frequency to