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

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Message-ID: <alpine.LFD.1.10.0808311039330.12958@nehalem.linux-foundation.org>
Date:	Sun, 31 Aug 2008 10:42:41 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Yinghai Lu <yhlu.kernel@...il.com>,
	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, Rafael J. Wysocki wrote:
> 
> Works, dmesg is at:
> http://www.sisk.pl/kernel/debug/mainline/2.6.27-rc5/2.6.27-rc5-test.log

That BAR is indeed "locked". Now that we try to reallocate it, you get 
this in the log:

	pci 0000:00:00.0: BAR 3: error updating (0x40000004 != 0xe0000004)
	pci 0000:00:00.0: BAR 3: error updating (high 0x000001 != 0x000000)

ie now the code _tried_ to update the BAR to point to 0x1_4000_0000 
instead, but the hardware refused, and it is still at 0x0_e000_0000.

So Yinghai's patch "worked", but it worked by doing nothing.

See my earlier guess about locked read-only resources a few emails back. 
IOW, I'm not at all surprised. I really do suspect that that BAR is some 
very special "this is the HT->PCIE region" BAR.

			Linus
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