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

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Message-ID: <20070605153221.GV11115@waste.org>
Date:	Tue, 5 Jun 2007 10:32:21 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	bzolnier@...il.com
Subject: Re: [PATCH 3/6] lguest suppress IDE probing

On Wed, Jun 06, 2007 at 12:58:03AM +1000, Rusty Russell wrote:
> 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.

Switching to libata accomplishes the same and isn't quite as ugly. I'd
just drop this patch and put a note about it in lguest.txt, as libata
seems to be the fashionable thing to do these days.

> 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);
>  
> 

-- 
Mathematics is the supreme nostalgia of our time.
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