linux-kernel - Re: Linux 2.6.27-rc5: System boot regression caused by commit a2bd7274b47124d2fc4dfdb8c0591f545ba749dd

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Message-ID: <alpine.LFD.1.10.0808311100520.12958@nehalem.linux-foundation.org>
Date:	Sun, 31 Aug 2008 11:03:44 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Yinghai Lu <yhlu.kernel@...il.com>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeff Garzik <jeff@...zik.org>, Tejun Heo <htejun@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	David Witbrodt <dawitbro@...global.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kernel Testers <kernel-testers@...r.kernel.org>
Subject: Re: Linux 2.6.27-rc5: System boot regression caused by commit
 a2bd7274b47124d2fc4dfdb8c0591f545ba749dd



On Sun, 31 Aug 2008, Yinghai Lu wrote:
> 
> wonder how the probe could find out the size of is 1fff_ffff..

Heh. That's how PCI sizing works: you write all ones to the register, and 
read back the result. The low bits won't change, and that indicates the 
size.

But if _none_ of the bits change, then that simply means that the size 
will be calculated to be 0xffffffff-start.

So the sizing will "work", it will just always report that the BAR covers 
everything from start to the 4G limit.

		Linus
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