linux-kernel - Re: [BUG 2.6.31-rc1] HIGHMEM64G causes hang in PCI init on 32-bit x86

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Date:	Mon, 29 Jun 2009 18:24:22 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Mikael Pettersson <mikpe@...uu.se>,
	Matthew Wilcox <matthew@....cx>,
	Grant Grundler <grundler@...isc-linux.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [BUG 2.6.31-rc1] HIGHMEM64G causes hang in PCI init on 32-bit
 x86

H. Peter Anvin wrote:
> Yinghai Lu wrote:
>>>>  
>>> That doesn't quite look right; for one thing it doesn't handle the
>>> (admittedly somewhat unlikely) case of end pointing to the end of the
>>> address space.
>>>
>>> Something like:
>>>
>>> 	if (start > (resource_size_t)end-1)
>>> 		continue;
>>>
> 
>> +		if (start > (resource_size_t)end)
>>  			continue;
> 
> Erk... thinko on my part.  Should have been (resource_size_t)-1.
> 

how about start is already 32M ?
you will insert blank one...

64bit, we could expand range that is above 4g to be aligned.

YH
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