kernel-hacking: create a submenu for scheduler debugging options

Create a submenu 'Scheduler Debugging' for scheduler debugging options.

Link: http://lkml.kernel.org/r/20190909144453.3520-8-changbin.du@gmail.comSigned-off-by: Changbin Du <changbin.du@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

lib/Kconfig.debug

@@ -971,6 +971,8 @@ config WQ_WATCHDOG
 
 endmenu # "Debug lockups and hangs"
 
+menu "Scheduler Debugging"
+
 config SCHED_DEBUG
 	bool "Collect scheduler debugging info"
 	depends on DEBUG_KERNEL && PROC_FS
@@ -997,6 +999,8 @@ config SCHEDSTATS
 	  application, you can say N to avoid the very slight overhead
 	  this adds.
 
+endmenu
+
 config DEBUG_TIMEKEEPING
 	bool "Enable extra timekeeping sanity checking"
 	help