linux-kernel - Re: [PATCH 09/34] x86: Allow to override the ROOT

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Date:	Tue, 05 Apr 2011 08:30:09 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Michal Marek <mmarek@...e.cz>
CC:	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org
Subject: Re: [PATCH 09/34] x86: Allow to override the ROOT_DEV variable

On 04/05/2011 07:58 AM, Michal Marek wrote:
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: x86@...nel.org
> Signed-off-by: Michal Marek <mmarek@...e.cz>
> ---
>  arch/x86/boot/Makefile |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile
> index f7cb086..7a70c60 100644
> --- a/arch/x86/boot/Makefile
> +++ b/arch/x86/boot/Makefile
> @@ -13,7 +13,7 @@
>  # This can be either FLOPPY, CURRENT, /dev/xxxx or empty, in which case
>  # the default of FLOPPY is used by 'build'.
>  
> -ROOT_DEV	:= CURRENT
> +ROOT_DEV	?= CURRENT
>  
>  # If you want to preset the SVGA mode, uncomment the next line and
>  # set SVGA_MODE to whatever number you want.

Is this a good thing?  As far as I understand ?= it may mean picking
something up from the outside environment.

Since ROOT_DEV has been obsolete for 15 years or more, this would seem
to be a needless new error mode.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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