linux-kernel - Re: [PATCH] Initialize max_pfn_mapped as initial ident mapping size for x86

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Message-ID: <CAE9FiQVU8fafCEZrRPADMYubvncxT+0FGdWVPuu0M=O8NYaCYw@mail.gmail.com>
Date:	Mon, 5 Mar 2012 22:27:32 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	zhenzhong.duan@...cle.com, Takashi Iwai <tiwai@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, stable@...r.kernel.org,
	linux-kernel@...r.kernel.org, konrad.wilk@...cle.com,
	joe.jin@...cle.com, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] Initialize max_pfn_mapped as initial ident mapping size
 for x86_64

On Mon, Mar 5, 2012 at 5:49 PM, H. Peter Anvin <hpa@...or.com> wrote:
>
> WHY does it have a problem with S4 resume?  S4 is Linux code, so there
> is a bug here that people keep trying to hack around instead of digging
> into.

it seems that problem only happen with Suse userland application etc.

Takashi, can you detail the steps so we can duplicate the problem ?

>
> The early mapping range we can fix, and probably should.  Mapping the
> first 4 GiB is not a lot of memory and makes a much more sensible
> starting point.

do you mean map the 4G in head_64.S?

Yinghai
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