[PATCH] uml: add debug switch for skas mode

It doesn't do anything but emit a warning, but there's a user population
that's used to adding 'debug' to the UML command line in order to gdb it.
With skas0 mode, that's not necessary, but these users need some indication
that 'debug' doesn't do what they want.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/kernel/um_arch.c

@@ -193,6 +193,24 @@ __uml_setup("root=", uml_root_setup,
 "        root=/dev/ubd5\n\n"
 );
 
+#ifndef CONFIG_MODE_TT
+
+static int __init no_skas_debug_setup(char *line, int *add)
+{
+	printf("'debug' is not necessary to gdb UML in skas mode - run \n");
+	printf("'gdb linux' and disable CONFIG_CMDLINE_ON_HOST if gdb \n");
+	printf("doesn't work as expected\n");
+
+	return 0;
+}
+
+__uml_setup("debug", no_skas_debug_setup,
+"debug\n"
+"    this flag is not needed to run gdb on UML in skas mode\n\n"
+);
+
+#endif
+
 #ifdef CONFIG_SMP
 static int __init uml_ncpus_setup(char *line, int *add)
 {