linux-kernel - Re: [PATCH] x86/microcode_intel_early.c: Get 32-bit physical address by __pa

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Date:	Tue, 19 Mar 2013 17:03:45 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	"Yu, Fenghua" <fenghua.yu@...el.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"penguin-kernel@...ove.sakura.ne.jp" 
	<penguin-kernel@...ove.sakura.ne.jp>,
	linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [PATCH] x86/microcode_intel_early.c: Get 32-bit physical address
 by __pa_nodebug()

On 03/19/2013 04:48 PM, Yinghai Lu wrote:
> 
> So do you mean we have to change all __pa_symbol before
> setup.c::setup_arch/find_low_pfn_range ?
> because only at that time max_low_pfn get setup.
> 

No, I suspect the problem is that the debugging code fails to notice
that max_low_pfn isn't set up yet because it is in linear mode, and so
it reads the wrong address when it checks max_low_pfn.

	-hpa

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