linux-kernel - [PATCH 3/6] lguest suppress IDE probing

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Message-Id: <1181055483.14054.40.camel@localhost.localdomain>
Date:	Wed, 06 Jun 2007 00:58:03 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	bzolnier@...il.com, Matt Mackall <mpm@...enic.com>
Subject: [PATCH 3/6] lguest suppress IDE probing

The IDE probe is the slowest part of boot: by suppressing it we cut
boot from from 3 seconds to half a second.

AFAICT, the commandline is the easiest way to suppress the probing.

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
---
 drivers/lguest/lguest.c |    6 ++++++
 1 file changed, 6 insertions(+)

===================================================================
--- a/drivers/lguest/lguest.c
+++ b/drivers/lguest/lguest.c
@@ -605,6 +605,12 @@ __init void lguest_init(void *boot)
 	acpi_disabled = 1;
 	acpi_ht = 0;
 #endif
+#ifdef CONFIG_BLK_DEV_IDE
+	/* Saves three seconds off boot time. */
+	strcat(boot_command_line,
+	       " ide0=noprobe ide1=noprobe ide2=noprobe"
+	       " ide3=noprobe ide4=noprobe ide5=noprobe");
+#endif
 
 	add_preferred_console("hvc", 0, NULL);
 


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