PM: Add initcall_debug style timing for suspend/resume

In order to diagnose overall suspend/resume times, we need
basic instrumentation to break down the total time into per
device timing, similar to initcall_debug.

This patch adds the basic timing instrumentation, needed
for a scritps/bootgraph.pl equivalent or humans.
The bootgraph.pl program is still a work in progress, but
is far enough along to know that this patch is sufficient.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/init.h b/include/linux/init.h
index ff8bde520d03..ab1d31f9352b 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -149,6 +149,8 @@ void prepare_namespace(void);
 
 extern void (*late_time_init)(void);
 
+extern int initcall_debug;
+
 #endif
   
 #ifndef MODULE