Setup: introduce __obsolete_setup macro to denote truly obsolete

       parameters. Whenever such parameter is specified kernel
       will complain that "Parameter %s is obsolete, ignored"

include/linux/init.h

@@ -110,12 +110,21 @@ struct obs_kernel_param {
 };
 
 /* OBSOLETE: see moduleparam.h for the right way. */
-#define __setup(str, fn)					\
-	static char __setup_str_##fn[] __initdata = str;	\
-	static struct obs_kernel_param __setup_##fn		\
+#define __setup_param(str, unique_id, fn)			\
+	static char __setup_str_##unique_id[] __initdata = str;	\
+	static struct obs_kernel_param __setup_##unique_id	\
 		 __attribute_used__				\
 		 __attribute__((__section__(".init.setup")))	\
-		= { __setup_str_##fn, fn }
+		= { __setup_str_##unique_id, fn }
+
+#define __setup_null_param(str, unique_id)			\
+	__setup_param(str, unique_id, NULL)
+
+#define __setup(str, fn)					\
+	__setup_param(str, fn, fn)
+
+#define __obsolete_setup(str)					\
+	__setup_null_param(str, __LINE__)
 
 #endif /* __ASSEMBLY__ */
 
@@ -172,7 +181,10 @@ struct obs_kernel_param {
 	{ return exitfn; }					\
 	void cleanup_module(void) __attribute__((alias(#exitfn)));
 
-#define __setup(str,func) /* nothing */
+#define __setup_param(str, unique_id, fn)	/* nothing */
+#define __setup_null_param(str, unique_id) 	/* nothing */
+#define __setup(str, func) 			/* nothing */
+#define __obsolete_setup(str) 			/* nothing */
 #endif
 
 /* Data marked not to be saved by software_suspend() */

init/main.c

@@ -155,8 +155,11 @@ static int __init obsolete_checksetup(char *line)
 	p = &__setup_start;
 	do {
 		int n = strlen(p->str);
-		if (!strncmp(line,p->str,n)) {
-			if (p->setup_func(line+n))
+		if (!strncmp(line, p->str, n)) {
+			if (!p->setup_func) {
+				printk(KERN_WARNING "Parameter %s is obsolete, ignored\n", p->str);
+				return 1;
+			} else if (p->setup_func(line + n))
 				return 1;
 		}
 		p++;