linux-kernel - Re: [PATCH v6 19/27] x86, boot: update comments about entries for 64bit image

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Date:	Thu, 13 Dec 2012 15:27:52 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 19/27] x86, boot: update comments about entries for
 64bit image

On 12/13/2012 02:02 PM, Yinghai Lu wrote:
> +	 * If we come here from a bootloader, kernel(text+data+bss+brk),
> +	 * ramdisk, zero_page, command line could be above 4G.
> +	 * We depend on an identity mapped page table being provided
> +	 * that maps our entire kernel(text+data+bss+brk), and hopefully
> +	 * all of memory.

We should make it explicit what we depend on.  We certainly *can* depend
only on text+data+bss+brk ... with the dynamic page table approach we
can do that, and that would be most conservative; if we depend on other
things we should make that explicit, not just here but in boot.txt.

	-hpa


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