forked from Minki/linux
i386: fix a hang on stuck nmi watchdog
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>
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@ -115,12 +115,12 @@ static int __init check_nmi_watchdog(void)
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atomic_dec(&nmi_active);
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}
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}
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endflag = 1;
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if (!atomic_read(&nmi_active)) {
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kfree(prev_nmi_count);
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atomic_set(&nmi_active, -1);
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return -1;
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}
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endflag = 1;
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printk("OK.\n");
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/* now that we know it works we can reduce NMI frequency to
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