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

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Date:	Sat, 27 Jun 2009 23:34:32 +0200
From:	Mikael Pettersson <mikpe@...uu.se>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Mikael Pettersson <mikpe@...uu.se>,
	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 writes:
 > Mikael Pettersson wrote:
 > > 
 > > Sure. This is from 2.6.31-rc1 with the commit commented out and
 > > replaced by a debug printk:
 > > 
 > > identify_cpu: ->x86_phys_bits == 36, would change iomem_resource.end from 0xffffffffffffffff to 0x0000000fffffffff
 > > 
 > > which looks correct for HIGHMEM64G.
 > 
 > OK, I'm going to revert the checkin... however, we still need to figure
 > out what the right answer here is, and why this broke (and why none of
 > my tests showed this failure...)
 > 
 > However, it is clear that the answer is more complex than we originally
 > anticipated.  Mikael, would you be willing to run some experiments over
 > the near future?

Yes

/Mikael
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