From 5d8a29ae73aa9a0dac7aa7ec970bbe2d8f45b189 Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@davemloft.net>
Date: Sun, 29 Mar 2009 15:40:33 -0700
Subject: sparc64: Fix reset hangs on Niagara systems.
[ Upstream commit ffaba674090f287afe0c44fd8d978c64c03581a8 ]
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>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
arch/sparc/kernel/nmi.c | 23 ++++++++++++++++++++++-
1 file changed, 22 insertions(+), 1 deletion(-)
diff --git a/arch/sparc/kernel/nmi.c b/arch/sparc/kernel/nmi.c
index f3577223c86..2c0cc72d295 100644
--- a/arch/sparc/kernel/nmi.c
+++ b/arch/sparc/kernel/nmi.c
@@ -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)
--
cgit v1.2.3-18-g5258