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

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Message-ID: <CAE9FiQXi6XZ9_7CDS_Ypgd59tSouhw8TCePCdJQNC7bhGMO8WQ@mail.gmail.com>
Date:	Thu, 13 Dec 2012 16:44:03 -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 4:38 PM, H. Peter Anvin <hpa@...or.com> 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.
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