Gitweb: http://git.kernel.org/linus/ffaba674090f287afe0c44fd8d978c64c03581a8
Commit: ffaba674090f287afe0c44fd8d978c64c03581a8
Parent: 07d43ba98621f08e252a48c96b258b4d572b0257
Author: David S. Miller <davem@davemloft.net>
AuthorDate: Sun Mar 29 15:40:33 2009 -0700
Committer: David S. Miller <davem@davemloft.net>
CommitDate: Sun Mar 29 15:40:33 2009 -0700
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>
---
arch/sparc/kernel/nmi.c | 23 ++++++++++++++++++++++-
1 files changed, 22 insertions(+), 1 deletions(-)
diff --git a/arch/sparc/kernel/nmi.c b/arch/sparc/kernel/nmi.c
index f357722..2c0cc72 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)
--
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