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    Subject[PATCH 3/5] ARM: Register with kernel restart handler
    Date
    From: Guenter Roeck <linux@roeck-us.net>

    By making use of the kernel restart handler, board specific restart
    handlers can be prioritized amongst available mechanisms for a particular
    board or system.

    Select the default priority of 128 to indicate that the restart callback
    in the machine description is the default restart mechanism.

    Acked-by: Arnd Bergmann <arnd@arndb.de>
    Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
    Signed-off-by: Guenter Roeck <linux@roeck-us.net>
    Signed-off-by: Thierry Reding <treding@nvidia.com>
    Signed-off-by: Lee Jones <lee.jones@linaro.org>
    ---
    arch/arm/kernel/setup.c | 20 ++++++++++++++++++--
    1 file changed, 18 insertions(+), 2 deletions(-)

    diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
    index 1a5edf562e85e..08c5676477d70 100644
    --- a/arch/arm/kernel/setup.c
    +++ b/arch/arm/kernel/setup.c
    @@ -1081,6 +1081,20 @@ void __init hyp_mode_check(void)
    #endif
    }

    +static void (*__arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);
    +
    +static int arm_restart(struct notifier_block *nb, unsigned long action,
    + void *data)
    +{
    + __arm_pm_restart(action, data);
    + return NOTIFY_DONE;
    +}
    +
    +static struct notifier_block arm_restart_nb = {
    + .notifier_call = arm_restart,
    + .priority = 128,
    +};
    +
    void __init setup_arch(char **cmdline_p)
    {
    const struct machine_desc *mdesc = NULL;
    @@ -1149,8 +1163,10 @@ void __init setup_arch(char **cmdline_p)
    kasan_init();
    request_standard_resources(mdesc);

    - if (mdesc->restart)
    - arm_pm_restart = mdesc->restart;
    + if (mdesc->restart) {
    + __arm_pm_restart = mdesc->restart;
    + register_restart_handler(&arm_restart_nb);
    + }

    unflatten_device_tree();

    --
    2.31.1
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