orderly_poweroff is triggered when a graceful shutdown
of system is desired. This may be used in many critical states of the
kernel such as when subsystems detects conditions such as critical
temperature conditions. However, in certain conditions in system
boot up sequences like those in the middle of driver probes being
initiated, userspace will be unable to power off the system in a clean
manner and leaves the system in a critical state. In cases like these,
the /sbin/poweroff will return success (having forked off to attempt
powering off the system. However, the system overall will fail to
completely poweroff (since other modules will be probed) and the system
is still functional with no userspace (since that would have shut itself
off).

However, there is no clean way of detecting such failure of userspace
powering off the system. In such scenarios, it is necessary for a backup
workqueue to be able to force a shutdown of the system when orderly
shutdown is not successful after a configurable time period.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Suggested-by: Eduardo Valentin <edubezval@gmail.com> 
Reported-by: Nishanth Menon <nm@ti.com>
---
Links to previous discussion can be found here:

http://www.spinics.net/lists/linux-omap/msg124925.html

Boot tested on DRA7.

changes in v2:

	* Changed #ifdef to #if CONFIG_SHUTDOWN_BACKUP_DELAY_MS

 arch/Kconfig    |  7 +++++++
 kernel/reboot.c | 23 ++++++++++++++++++-----
 2 files changed, 25 insertions(+), 5 deletions(-)

Index: linux/arch/Kconfig
===================================================================

--- linux.orig/arch/Kconfig	2016-01-11 15:26:07.732173131 +0530
+++ linux/arch/Kconfig	2016-01-11 15:26:07.728173205 +0530

@@ -37,6 +37,18 @@
 	def_bool y
 	depends on PERF_EVENTS && HAVE_PERF_EVENTS_NMI && !PPC64
 
+config SHUTDOWN_BACKUP_DELAY_MS
+	int "Backup shutdown delay in milli-seconds"
+	default 0
+	help
+	  The number of milliseconds to delay before backup workqueue
+	  executes attempting to poweroff the system after the
+	  orderly_poweroff function has failed to complete.
+
+	  If set to 0, the backup workqueue is not active. The value
+	  should be conservatively configured based on userspace latencies
+	  expected for a given system.