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

From: H. Peter Anvin
Date: Mon Mar 01 2010 - 13:17:11 EST

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.

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