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Date:	Tue, 10 Nov 2009 12:55:55 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	linux-kernel@...r.kernel.org, chrisw@...s-sol.org,
	wmw2@...radead.org, joerg.roedel@....com, muli@...ibm.com
Subject: Re: [PATCH v2 0/9] x86: handle HW IOMMU initialization failure
 gracefully


hm, one of the swiotlb patches caused this bootup crash:

[    8.645490] initcall ali_init+0x0/0x40 returned 0 after 61 usecs
[    8.651501] calling  amd_init+0x0/0x16 @ 1
[    8.655620] pata_amd 0000:00:06.0: version 0.4.1
[    8.660286] BUG: unable to handle kernel NULL pointer dereference at 00000034
[    8.663572] IP: [<c100617b>] dma_supported+0x3b/0xa4
[    8.663572] *pde = 00000000 
[    8.663572] Oops: 0000 [#1] SMP 
[    8.663572] last sysfs file: 
[    8.663572] 
[    8.663572] Pid: 1, comm: swapper Not tainted (2.6.32-rc6-tip-02065-gadf90fa-dirty #344) System Product Name
[    8.663572] EIP: 0060:[<c100617b>] EFLAGS: 00010246 CPU: 0
[    8.663572] EIP is at dma_supported+0x3b/0xa4
[    8.663572] EAX: f6ce4058 EBX: 00000000 ECX: 00000000 EDX: ffffffff
[    8.663572] ESI: 00000000 EDI: f6ce4000 EBP: f6cbbe1c ESP: f6cbbe10
[    8.663572]  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[    8.663572] Process swapper (pid: 1, ti=f6cba000 task=f6cc0000 task.ti=f6cba000)
[    8.663572] Stack:
[    8.663572]  c158154e f608c000 ffffffff f6cbbe30 c13e1023 f609ab8c f6ce4058 00000000
[    8.663572] <0> f6cbbe60 c1581aa7 00000002 f609ab8c 00000003 00000000 f6ce4000 00000010
[    8.663572] <0> f6ce4000 00000000 f609ab8c f6ce4000 f6cbbe7c c1581c20 f6cbbe8c f6ce4058
[    8.663572] Call Trace:
[    8.663572]  [<c158154e>] ? ata_port_desc+0x4e/0x53
[    8.663572]  [<c13e1023>] ? pci_set_dma_mask+0x23/0x3b
[    8.663572]  [<c1581aa7>] ? ata_pci_bmdma_init+0x32/0x133
[    8.663572]  [<c1581c20>] ? ata_pci_sff_prepare_host+0x78/0xaf
[    8.663572]  [<c1581cd1>] ? ata_pci_sff_init_one+0x7a/0xe7
[    8.663572]  [<c1595897>] ? amd_init_one+0xec/0xf5
[    8.663572]  [<c13e2a24>] ? local_pci_probe+0x13/0x15
[    8.663572]  [<c13e31f0>] ? pci_device_probe+0x48/0x6b
[    8.663572]  [<c1519665>] ? really_probe+0x8e/0x165
[    8.663572]  [<c1519788>] ? driver_probe_device+0x4c/0x82
[    8.663572]  [<c1519806>] ? __driver_attach+0x48/0x64
[    8.663572]  [<c1518ef0>] ? bus_for_each_dev+0x42/0x6c
[    8.663572]  [<c1519491>] ? driver_attach+0x19/0x1b
[    8.663572]  [<c15197be>] ? __driver_attach+0x0/0x64
[    8.663572]  [<c15188b0>] ? bus_add_driver+0xfe/0x23a
[    8.663572]  [<c13ca19f>] ? kset_find_obj+0x23/0x4f
[    8.663572]  [<c1519a6b>] ? driver_register+0x7e/0xe5
[    8.663572]  [<c21e3c31>] ? amd_init+0x0/0x16
[    8.663572]  [<c13e33c7>] ? __pci_register_driver+0x3d/0x9a
[    8.663572]  [<c21e3c31>] ? amd_init+0x0/0x16
[    8.663572]  [<c21e3c45>] ? amd_init+0x14/0x16
[    8.663572]  [<c1001143>] ? do_one_initcall+0x51/0x136
[    8.663572]  [<c21b7324>] ? do_basic_setup+0x47/0x57
[    8.663572]  [<c21b73ae>] ? kernel_init+0x7a/0xbb
[    8.663572]  [<c21b7334>] ? kernel_init+0x0/0xbb
[    8.663572]  [<c1002e97>] ? kernel_thread_helper+0x7/0x10
[    8.663572] Code: 2b c2 83 f9 00 76 24 83 3d f8 38 1b c2 00 7e 1b 8b 58 08 e8 a4 fe 50 00 53 50 68 2e 67 ee c1 e8 16 f9 ad 00 31 db 83 c4 0c eb 62 <8b> 5b 34 85 db 74 06 ff d3 89 c3 eb 55 83 f9 00 77 0a 31 db 81 
[    8.663572] EIP: [<c100617b>] dma_supported+0x3b/0xa4 SS:ESP 0068:f6cbbe10
[    8.663572] CR2: 0000000000000034

config attached.

	Ingo

View attachment "config" of type "text/plain" (67007 bytes)

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