[MIPS] Make SMTC_IDLE_HOOK_DEBUG a proper option in Kconfig.debug.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig.debug

@@ -37,6 +37,15 @@ config DEBUG_STACK_USAGE
 
 	  This option will slow down process creation somewhat.
 
+config CONFIG_SMTC_IDLE_HOOK_DEBUG
+	bool "Enable additional debug checks before going into CPU idle loop"
+	depends on DEBUG_KERNEL && MIPS_MT_SMTC
+	help
+	  This option enables Enable additional debug checks before going into
+	  CPU idle loop.  For details on these checks, see
+	  arch/mips/kernel/smtc.c.  This debugging option result in significant
+	  overhead so should be disabled in production kernels.
+
 config KGDB
 	bool "Remote GDB kernel debugging"
 	depends on DEBUG_KERNEL && SYS_SUPPORTS_KGDB