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    Subject[PATCH 48/45] sparc64: Fix reset hangs on Niagara systems.
    -stable review patch.  If anyone has any objections, please let us know.
    ---------------------

    From: David S. Miller <davem@davemloft.net>

    [ 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(-)

    --- 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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