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sparc64: Fix reset hangs on Niagara systems. 

Hypervisor versions older than version 1.6.1 cannot handle
leaving the profile counter overflow interrupt chirping
when the system does a soft reset.

So use a reboot notifier to shut off the NMI watchdog.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2009-03-29 15:40:33 -07:00
parent 07d43ba986
commit ffaba67409
1 changed files with 22 additions and 1 deletions
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23
arch/sparc/kernel/nmi.c
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@ -13,6 +13,7 @@
#include <linux/module.h>
#include <linux/kprobes.h>
#include <linux/kernel_stat.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/kdebug.h>
#include <linux/delay.h>
@ -206,13 +207,33 @@ void nmi_adjust_hz(unsigned int new_hz)
}
EXPORT_SYMBOL_GPL(nmi_adjust_hz);
static int nmi_shutdown(struct notifier_block *nb, unsigned long cmd, void *p)
{
on_each_cpu(stop_watchdog, NULL, 1);
return 0;
}
static struct notifier_block nmi_reboot_notifier = {
.notifier_call = nmi_shutdown,
};
int __init nmi_init(void)
{
int err;
nmi_usable = 1;
on_each_cpu(start_watchdog, NULL, 1);
return check_nmi_watchdog();
err = check_nmi_watchdog();
if (!err) {
err = register_reboot_notifier(&nmi_reboot_notifier);
if (err) {
nmi_usable = 0;
on_each_cpu(stop_watchdog, NULL, 1);
}
}
return err;
}
static int __init setup_nmi_watchdog(char *str)