[PATCH] uml: update Kconfig help

The MODE_TT help was a little outdated.  This updates it in light of the
existence of skas0 mode.  It's also turned off by default since it is mostly
obsoleted by skas0 mode.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/Kconfig

@@ -35,12 +35,12 @@ menu "UML-specific options"
 
 config MODE_TT
 	bool "Tracing thread support"
-	default y
+	default n
 	help
 	This option controls whether tracing thread support is compiled
-	into UML.  Normally, this should be set to Y.  If you intend to
-	use only skas mode (and the host has the skas patch applied to it),
-	then it is OK to say N here.
+	into UML.  This option is largely obsolete, given that skas0 provides
+	skas security and performance without needing to patch the host.
+	It is safe to say 'N' here.
 
 config STATIC_LINK
 	bool "Force a static link"