[PATCH] Allow early_param and identical __setup to exist

We currently assume that boot parameters which are handled by
early_param() will not overlap boot parameters handled by __setup: if
they do, behaviour is dependent on link order, usually meaning __setup
will not get called.

ACPI wants to use early_param("pci"), and pci uses __setup("pci="), so
we modify the core to let them coexist: "pci=noacpi" will now get
passed to both.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andi Kleen <ak@suse.de>

init/main.c

@@ -162,16 +162,19 @@ extern struct obs_kernel_param __setup_start[], __setup_end[];
 static int __init obsolete_checksetup(char *line)
 {
 	struct obs_kernel_param *p;
+	int had_early_param = 0;
 
 	p = __setup_start;
 	do {
 		int n = strlen(p->str);
 		if (!strncmp(line, p->str, n)) {
 			if (p->early) {
-				/* Already done in parse_early_param?  (Needs
-				 * exact match on param part) */
+				/* Already done in parse_early_param?
+				 * (Needs exact match on param part).
+				 * Keep iterating, as we can have early
+				 * params and __setups of same names 8( */
 				if (line[n] == '\0' || line[n] == '=')
-					return 1;
+					had_early_param = 1;
 			} else if (!p->setup_func) {
 				printk(KERN_WARNING "Parameter %s is obsolete,"
 				       " ignored\n", p->str);
@@ -181,7 +184,8 @@ static int __init obsolete_checksetup(char *line)
 		}
 		p++;
 	} while (p < __setup_end);
-	return 0;
+
+	return had_early_param;
 }
 
 /*