[Xen-devel] [PATCH v2 2/6] ARM: xen: Register with kernel restart handler

[Guenter Roeck <linux@xxxxxxxxxxxx>]

Register with kernel restart handler instead of setting arm_pm_restart
directly.

Select a high priority of 192 to ensure that default restart handlers
are replaced if Xen is running.

Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Reviewed-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
v2: Rebased to v4.6-rc3, added Reviewed/by/Acked-by tags

 arch/arm/xen/enlighten.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 75cd7345c654..76a1d12fd27e 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -27,6 +27,7 @@
 #include <linux/cpu.h>
 #include <linux/console.h>
 #include <linux/pvclock_gtod.h>
+#include <linux/reboot.h>
 #include <linux/time64.h>
 #include <linux/timekeeping.h>
 #include <linux/timekeeper_internal.h>
@@ -193,14 +194,22 @@ after_register_vcpu_info:
        put_cpu();
 }
 
-static void xen_restart(enum reboot_mode reboot_mode, const char *cmd)
+static int xen_restart(struct notifier_block *nb, unsigned long action,
+                      void *data)
 {
        struct sched_shutdown r = { .reason = SHUTDOWN_reboot };
        int rc;
        rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
        BUG_ON(rc);
+
+       return NOTIFY_DONE;
 }
 
+static struct notifier_block xen_restart_nb = {
+       .notifier_call = xen_restart,
+       .priority = 192,
+};
+
 static void xen_power_off(void)
 {
        struct sched_shutdown r = { .reason = SHUTDOWN_poweroff };
@@ -370,7 +379,7 @@ static int __init xen_pm_init(void)
                return -ENODEV;
 
        pm_power_off = xen_power_off;
-       arm_pm_restart = xen_restart;
+       register_restart_handler(&xen_restart_nb);
        if (!xen_initial_domain()) {
                struct timespec64 ts;
                xen_read_wallclock(&ts);
-- 
2.5.0


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