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Commit ffaba674 authored by David S. Miller's avatar David S. Miller
Browse files

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: default avatarDavid S. Miller <davem@davemloft.net>
parent 07d43ba9

arch/sparc/kernel/nmi.c

+22 −1
Original line number Diff line number Diff line
@@ -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)