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

[H. Peter Anvin]

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/