linux-kernel - Re: [PATCH v6 05/27] x86, 64bit: clear ident mapping when kernel is above 512G

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Message-ID: <CAE9FiQXb3hLUeuOZuwN62mJhF29T-PyZ7Q82-rk1bYL0jJJFFw@mail.gmail.com>
Date:	Tue, 18 Dec 2012 19:57:51 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Borislav Petkov <bp@...en8.de>, Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 05/27] x86, 64bit: clear ident mapping when kernel is
 above 512G

On Sun, Dec 16, 2012 at 9:49 AM, Borislav Petkov <bp@...en8.de> wrote:
> On Thu, Dec 13, 2012 at 02:01:59PM -0800, Yinghai Lu wrote:
>> After following patch:
>>       x86, 64bit: Set extra ident mapping for whole kernel range
>>
>> We have extra ident mapping for kernel that is loaded above 1G.
>
> What?
>
> /me looks at next patch
>
> Aaah, the *next* patch adds an extra ident mapping. Why don't you say
> so?
>
>> So need to clear extra pgd entry when kernel is loaded above 512g.
>
> Why then isn't that patch following the next patch instead of coming
> before it?

make the transition smooth.

zap_ident is after setting in head_64.S

anyway the whole zap_ident get deleted and we don't need this patch anymore.

Yinghai
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