linux-kernel - [PATCH 1/2] Allow early_param and identical _

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Date:	Wed, 02 Aug 2006 19:06:47 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Andi Kleen <ak@...e.de>
Cc:	Andrew Morton <akpm@...l.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Ian Pratt <ian.pratt@...source.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Chris Wright <chrisw@...s-sol.org>,
	virtualization@...ts.osdl.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Christoph Lameter <clameter@....com>
Subject: [PATCH 1/2] 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@...tcorp.com.au>

diff -urpN --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.6.18-rc2-mm1/init/main.c working-2.6.18-rc2-mm1-i386-parse_early_param/init/main.c
--- linux-2.6.18-rc2-mm1/init/main.c	2006-08-01 14:12:11.000000000 +1000
+++ working-2.6.18-rc2-mm1-i386-parse_early_param/init/main.c	2006-08-02 16:48:39.000000000 +1000
@@ -182,16 +182,19 @@ extern struct obs_kernel_param __setup_s
 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 				printk(KERN_WARNING "Parameter %s is obsolete,"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);
@@ -201,7 +204,8 @@ static int __init obsolete_checksetup(ch
 		}
 		p++;
 	} while (p < __setup_end);
-	return 0;
+
+	return had_early_param;
 }
 
 /*

-- 
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