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    SubjectRE: [patch 0/4] x86: PAT followup - Incremental changes and bug fixes
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    Can you attach the e820 map from the top of your dmesg.

    Thanks,
    Venki

    >-----Original Message-----
    >From: Andreas Herrmann [mailto:andreas.herrmann3@amd.com]
    >Sent: Wednesday, January 16, 2008 10:58 AM
    >To: Pallipadi, Venkatesh
    >Cc: ak@muc.de; ebiederm@xmission.com; rdreier@cisco.com;
    >torvalds@linux-foundation.org; gregkh@suse.de;
    >airlied@skynet.ie; davej@redhat.com; mingo@elte.hu;
    >tglx@linutronix.de; hpa@zytor.com; akpm@linux-foundation.org;
    >arjan@infradead.org; Barnes, Jesse; davem@davemloft.net;
    >linux-kernel@vger.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@hunter) (gcc version ...
    >+Linux version 2.6.24-rc8-g2ea3cf43 (root@hunter) (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@0xc0403000 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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