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

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Message-ID: <CAE9FiQURsKT8Ufy7NmWUzrzkYoH65Edk6e_kJkw_+YYx=1bXTg@mail.gmail.com>
Date:	Thu, 13 Dec 2012 16:13:49 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
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 Thu, Dec 13, 2012 at 3:27 PM, H. Peter Anvin <hpa@...or.com> wrote:
> 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.

yes, in my version, only need kernel(text+data+bss+brk) get mapped.
aka the INIT_SIZE for decompressing.
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