linux-kernel - [PATCH] x86 built-in command line (resend)

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Date:	Mon, 31 Jul 2006 12:13:00 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: [PATCH] x86 built-in command line (resend)

I'm resending this as-is because the earlier thread petered out
without any strong arguments against this approach. x86_64 patch to
follow.

Allow setting the kernel command line at compile time on x86.

Signed-off-by: Matt Mackall <mpm@...enic.com>

Index: linux/arch/i386/Kconfig
===================================================================
--- linux.orig/arch/i386/Kconfig	2006-07-26 18:08:28.000000000 -0500
+++ linux/arch/i386/Kconfig	2006-07-27 16:09:13.000000000 -0500
@@ -830,6 +830,20 @@ config COMPAT_VDSO
 
 	  If unsure, say Y.
 
+config CMDLINE_BOOL
+	bool "Default bootloader kernel arguments" if EMBEDDED
+
+config CMDLINE
+	string "Initial kernel command string" if EMBEDDED
+	depends on CMDLINE_BOOL
+	default "root=/dev/hda1 ro"
+	help
+	  On some systems, there is no way for the boot loader to pass
+	  arguments to the kernel. For these platforms, you can supply
+	  some command-line options at build time by entering them
+	  here. In most cases you will need to specify the root device
+	  here.
+
 endmenu
 
 config ARCH_ENABLE_MEMORY_HOTPLUG
Index: linux/arch/i386/kernel/setup.c
===================================================================
--- linux.orig/arch/i386/kernel/setup.c	2006-07-26 18:08:28.000000000 -0500
+++ linux/arch/i386/kernel/setup.c	2006-07-27 16:09:13.000000000 -0500
@@ -723,6 +723,10 @@ static void __init parse_cmdline_early (
 	int len = 0;
 	int userdef = 0;
 
+#ifdef CONFIG_CMDLINE_BOOL
+	strlcpy(saved_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
+#endif
+
 	/* Save unparsed command line copy for /proc/cmdline */
 	saved_command_line[COMMAND_LINE_SIZE-1] = '\0';
 


-- 
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