Re: [PATCH v6 19/27] x86, boot: update comments about entries for64bit image

[Yinghai Lu]

On Thu, Dec 13, 2012 at 4:44 PM, Yinghai Lu <yinghai@xxxxxxxxxx> wrote:
> On Thu, Dec 13, 2012 at 4:38 PM, H. Peter Anvin <hpa@xxxxxxxxx> wrote:
>> On 12/13/2012 04:13 PM, Yinghai Lu wrote:
>>
>> It is definitely the minmum we can rely on, and so is the minimum we should
>> rely on.  In fact, we don't even need .bss/.brk to be mapped, but we
>> probably should require that as a matter of protocol.
>
> in my version of arch/x86/kernel/head_64.S is using BRK to do
> ident/kernel high mapping
> for kernel that is above 4G.
> so .brk is needed.

also need to make sure zero page and command line get ident mapping.
because arch/x86/boot/compressed/head_64.S is using them.
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