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Subject[PATCH v4 3/7] arm: Support restart through restart notifier call chain
The kernel core now supports a notifier call chain for system
restart functions.

With this change, the arm_pm_restart callback is now optional,
so check if it is set before calling it. Only call the notifier
functions if arm_pm_restart is not set.

Signed-off-by: Guenter Roeck <>
v4: No change.
v3: Use wrapper function to execute notifier call chain.
v2: Only call notifier call chain if arm_pm_restart is not set.
Do not include linux/watchdog.h.

arch/arm/kernel/process.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 81ef686..5d191e3 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -230,7 +230,10 @@ void machine_restart(char *cmd)

- arm_pm_restart(reboot_mode, cmd);
+ if (arm_pm_restart)
+ arm_pm_restart(reboot_mode, cmd);
+ else
+ kernel_restart_notify(cmd);

/* Give a grace period for failure to restart of 1s */

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