linux-kernel - Re: [PATCH -mm 2/4] x86_64 boot: Add linked list of struct setup

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Message-Id: <1206670181.13404.7.camel@caritas-dev.intel.com>
Date:	Fri, 28 Mar 2008 10:09:41 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	Paul Jackson <pj@....com>
Cc:	hpa@...or.com, andi@...stfloor.org, mingo@...hat.com,
	tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm 2/4] x86_64 boot: Add linked list of struct
	setup_data

On Thu, 2008-03-27 at 06:33 -0500, Paul Jackson wrote:
> Huang wrote:
> +/* setup data types */
> +#define SETUP_NONE			0
> +
> +/* extensible setup data list node */
> +struct setup_data {
> +	u64 next;
> +	u32 type;
> +	u32 len;
> +	u8 data[0];
> +};
> 
> 
> I don't understand what purpose the 'type' field serves.

The setup_data will not only be used for E820 extension. So a type field
is used to distinguish various setup_data.

Best Regards,
Huang Ying
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