linux-kernel - RE: [patch 0/4] x86: PAT followup - Incremental changes and bug fixes

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Date:	Wed, 16 Jan 2008 11:05:31 -0800
From:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
To:	"Andreas Herrmann" <andreas.herrmann3@....com>
Cc:	<ak@....de>, <ebiederm@...ssion.com>, <rdreier@...co.com>,
	<torvalds@...ux-foundation.org>, <gregkh@...e.de>,
	<airlied@...net.ie>, <davej@...hat.com>, <mingo@...e.hu>,
	<tglx@...utronix.de>, <hpa@...or.com>, <akpm@...ux-foundation.org>,
	<arjan@...radead.org>, "Barnes, Jesse" <jesse.barnes@...el.com>,
	<davem@...emloft.net>, <linux-kernel@...r.kernel.org>
Subject: RE: [patch 0/4] x86: PAT followup - Incremental changes and bug fixes


Can you attach the e820 map from the top of your dmesg.

Thanks,
Venki 

>-----Original Message-----
>From: Andreas Herrmann [mailto:andreas.herrmann3@....com] 
>Sent: Wednesday, January 16, 2008 10:58 AM
>To: Pallipadi, Venkatesh
>Cc: ak@....de; ebiederm@...ssion.com; rdreier@...co.com; 
>torvalds@...ux-foundation.org; gregkh@...e.de; 
>airlied@...net.ie; davej@...hat.com; mingo@...e.hu; 
>tglx@...utronix.de; hpa@...or.com; akpm@...ux-foundation.org; 
>arjan@...radead.org; Barnes, Jesse; davem@...emloft.net; 
>linux-kernel@...r.kernel.org
>Subject: Re: [patch 0/4] x86: PAT followup - Incremental 
>changes and bug fixes
>
>Hi,
>
>I just want to report that the PAT support in x86/mm causes crashes
>on two of my test machines. On both boxes the SATA detection does
>not work when the PAT support is patched into the kernel.
>
>Symptoms are as follows -- best described by a diff between the
>two boot.logs:
>
># diff boot-failing.log boot-working.log
>
>-Linux version 2.6.24-rc8-ga9f7faa5 (root@...ter) (gcc version ...
>+Linux version 2.6.24-rc8-g2ea3cf43 (root@...ter) (gcc version ...
>...
> early_iounmap(ffffffff82a0b000, 00001000)
>-early_ioremap(000000000000c000, 00001000) => -000002103394304
>-early_iounmap(ffffffff82a0c000, 00001000)
> early_iounmap(ffffffff82808000, 00001000)
>...
>-ACPI: PCI interrupt for device 0000:00:12.0 disabled
>-sata_sil: probe of 0000:00:12.0 failed with error -12
>+scsi0 : sata_sil
>+scsi1 : sata_sil
>+ata1: SATA max UDMA/100 mmio m512@...0403000 tf 0xc0403080 irq 22
>...
>-AC'97 space ioremap problem
>-ACPI: PCI interrupt for device 0000:00:14.5 disabled
>-ATI IXP AC97 controller: probe of 0000:00:14.5 failed with error -5
> ALSA device list:
>-  No soundcards found.
>+  #0: ATI IXP rev 80 with ALC655 at 0xc0403800, irq 17
>...
>-VFS: Cannot open root device "sda1" or unknown-block(0,0)
>-Please append a correct "root=" boot option; here are the 
>available partitions:
>-1600    4194302 hdc driver: ide-cdrom
>-Kernel panic - not syncing: VFS: Unable to mount root fs on 
>unknown-block(0,0)
>+kjournald starting.  Commit interval 5 seconds
>+EXT3-fs: mounted filesystem with ordered data mode.
>+VFS: Mounted root (ext3 filesystem) readonly.
>...
>
>   <snip>
> 
>The second test machine uses ahci. But the symptoms are similar.
>
>I performed a git-bisect on x86/mm. Last commit that worked for me was
>
>2ea3cf43fddecbfd66353caafdf73ec21ea3760b (x86: fix 
>early_ioremap() ISA window)
>
>The subsequent commits for PAT support introduced the problem.
>I noticed that PAT should be disabled by default, but 
>obviously the patches
>still have some side-effect. (Maybe ioremap changes lead to 
>the problem?)
>
>Boot-logs are attached:
>
>  boot-failing.log for x86/mm as of v2.6.24-rc8-672-ga9f7faa
>  boot-working.log for x86/mm as of v2.6.24-rc8-621-g2ea3cf4
>
>Hopefully it helps to track down the problem.
>Maybe someone has an idea why the PAT patches are causing that
>ominous "PCI interrupt for device ... disabled" messages.
>
>
>Thanks and regards,
>
>Andreas
>
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