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

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Date:	Tue, 30 Jun 2009 16:16:45 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Mikael Pettersson <mikpe@...uu.se>,
	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

Linus Torvalds wrote:
> 
> On Tue, 30 Jun 2009, Yinghai Lu wrote:
>> how about x = 0, y = 0x100?
> 
> Yeah, no. Peter's trick doesn't work. Good catch. 
> 
> I don't see any single-use trick then, and so it needs the whole statement 
> expression mess.
> 

Yes, the | trick only works if you know you have a nonzero alignment pad
(or you want a full-block pad in the empty case.)

	-hpa

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