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

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Message-ID: <4A4967CF.2080007@zytor.com>
Date:	Mon, 29 Jun 2009 18:18:07 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
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

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.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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