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Date:	Fri, 18 Jul 2014 00:34:12 -0700
From:	Guenter Roeck <>
Cc:	Wim Van Sebroeck <>,
	Catalin Marinas <>,
	Maxime Ripard <>,
	Will Deacon <>,
	Arnd Bergmann <>,
	Heiko Stuebner <>,
	Russell King <>,
	Jonas Jensen <>,
	Randy Dunlap <>,
	Andrew Morton <>,
	Steven Rostedt <>,
	Ingo Molnar <>,
	Dmitry Eremin-Solenikov <>,
	David Woodhouse <>,
	Tomasz Figa <>,,, Guenter Roeck <>
Subject: [PATCH v5 3/7] arm: Support restart through restart handler call chain

The kernel core now supports a restart handler 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 kernel restart handler
if arm_pm_restart is not set.

Signed-off-by: Guenter Roeck <>
v5: Renamed restart function to do_kernel_restart
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..84ca0d5 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
+		do_kernel_restart(cmd);
 	/* Give a grace period for failure to restart of 1s */

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