linux-kernel - Re: 2.6.33-git6 boot failure[x86_64] (WARN: at arch/x86/mm/ioremap.c:111)

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Date:	Mon, 01 Mar 2010 10:16:26 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Wu Fengguang <fengguang.wu@...el.com>,
	Xiaotian Feng <xtfeng@...il.com>,
	Sachin Sant <sachinp@...ibm.com>,
	Yinghai Lu <yinghai@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>
Subject: Re: 2.6.33-git6 boot failure[x86_64] (WARN: at arch/x86/mm/ioremap.c:111)

On 03/01/2010 08:31 AM, Thomas Gleixner wrote:
> On Mon, 1 Mar 2010, Wu Fengguang wrote:
>  Ah walk_system_ram_range() is actually doing almost the same alignment
>> check as the removed x86 page_is_ram(), except that it calls func()
>> with len=0.  This happens when page_is_ram(cffa3000) is called.
>>
>> walk_system_ram_range():
>>     pfn = (unsigned long)(res.start >> PAGE_SHIFT);
>>     len = (unsigned long)((res.end + 1 - res.start) >> PAGE_SHIFT);
>>     ret = (*func)(pfn, len, arg);
>>
>> The following patch should fix the problem.
> 
> Right, that should fix it. Though I wonder whether we should warn
> prominently about non page aligned e820 mapping entries.
> 

Pointless.  It's way too common, and in the case of the lowmem region,
probably correct.

	-hpa
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