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

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Message-ID: <4A4A5EF1.3080005@zytor.com>
Date:	Tue, 30 Jun 2009 11:52:33 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Rolf Eike Beer <eike-kernel@...tec.de>
CC:	Mikael Pettersson <mikpe@...uu.se>,
	Yinghai Lu <yinghai@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Matthew Wilcox <matthew@....cx>,
	Grant Grundler <grundler@...isc-linux.org>,
	Linux Kernel Mailing List <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

Rolf Eike Beer wrote:
> H. Peter Anvin wrote:
>> Mikael Pettersson wrote:
>>> Thanks, 2.6.31-rc1 vanilla (which didn't boot) plus this one does boot.
>>> /proc/iomem now looks as follows:
>> ... as it should.  So far so good, and this is a real problem.
>>
>> However, there is something that really bothers me: *why does this help
>> on Mikael's system, which is PAE and therefore has a 64-bit
>> resource_size_t*?  This whole patch should be a no-op!  There is still
>> something that doesn't make sense.
>>
>> The use of "unsigned long" in ram_alignment() will overflow after 2^52
>> bytes, but again, that's not the issue here, since the highest "start"
>> value we have is (0x2 << 32).
> 
> I assume you meant "2^32" and (0x1 << 32)?
> 

No, I meant 2^52 and (0x2 << 32) [== 2^33.]

	-hpa

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