linux-kernel - Re: [PATCH -v2 09/13] x86: Fixup code testing if a pfn is direct mapped

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Date:	Mon, 3 Sep 2012 08:32:36 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>, Jacob Shin <jacob.shin@....com>,
	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -v2 09/13] x86: Fixup code testing if a pfn is direct mapped

On Sun, Sep 2, 2012 at 10:46 AM, Yinghai Lu <yinghai@...nel.org> wrote:
> From: Jacob Shin <jacob.shin@....com>
>
> Update code that previously assumed pfns [ 0 - max_low_pfn_mapped ) and
> [ 4GB - max_pfn_mapped ) were always direct mapped, to now look up
> pfn_mapped ranges instead.

What problem does this fix? How did you find about it?

> -v2: change applying sequence to keep git bisecting working.
>      so add dummy pfn_range_is_mapped(). - Yinghai Lu
>
> Signed-off-by: Jacob Shin <jacob.shin@....com>

Yinghai's sign-off is missing.
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