[PATCH 1/2] kernel/reboot.c: Add orderly_reboot for graceful reboot

[Andrew Morton]

On Mon, 30 Mar 2015 12:45:32 +1030 Joel Stanley <joel at jms.id.au> wrote:

> The kernel has orderly_poweroff which allows the kernel to initiate a
> graceful shutdown of userspace, by running /sbin/poweroff. This adds
> orderly_reboot that will cause userspace to shut itself down by calling
> /sbin/reboot.
> 
> This will be used for shutdown initiated by a system controller on
> platforms that do not use ACPI.

gee.  There are a lot of callers of emergency_restart().  Why is the
BMC reboot special, and how many of the emergency_restart() callers
really be using orderly_reboot()?

We have /proc/sys/kernel/poweroff_cmd.  Should we have
/proc/sys/kernel/reboot_cmd as well?  If not,
kernel/reboot.c:reboot_cmd[] can be made static ;)