On 07/07/2014 02:16 PM, Andrew Morton wrote:

On Sun,  6 Jul 2014 16:38:15 -0700 Guenter Roeck [off-list ref] wrote:

quoted

The kernel core now supports a notifier call chain to restart
the system. Call it if arm_pm_restart is not set.

...

--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c

@@ -174,6 +174,9 @@ void machine_restart(char *cmd)
  	/* Now call the architecture specific reboot code. */
  	if (arm_pm_restart)
  		arm_pm_restart(reboot_mode, cmd);
+	else
+		blocking_notifier_call_chain(&restart_notifier_list,
+					     reboot_mode, cmd);

It would be a bit neater to have a helper function to perform the call,
rather than directly accessing the notifier list.  Apart from anything
else, this hides the fact that the core code (presently!) uses the
blocking_ style notifiers.

Introduced kernel_restart_notify (proposals for better names welcome).
As a side effect, moved restart_notifier_list into kernel/reboot.c and
made it static.

Thanks,
Guenter