linux-kernel - Re: [PATCH v2 0/8] sparc: use asm-generic/dma-mapping-common.h and pci-dma-compat.h

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Message-Id: <20090714103941B.fujita.tomonori@lab.ntt.co.jp>
Date:	Tue, 14 Jul 2009 10:40:16 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	reif@...thlink.net, joerg.roedel@....com, mingo@...e.hu
Cc:	fujita.tomonori@....ntt.co.jp, davem@...emloft.net,
	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org,
	x86@...nel.org, tony.luck@...el.com, akpm@...ux-foundation.org
Subject: Re: [PATCH v2 0/8] sparc: use asm-generic/dma-mapping-common.h and
 pci-dma-compat.h

On Mon, 13 Jul 2009 20:56:21 -0400
Robert Reif <reif@...thlink.net> wrote:

> FUJITA Tomonori wrote:
> > This is the second version of the patchset to convert SPARC to
> > asm-generic/dma-mapping-common.h and pci-dma-compat.h:
> >
> >   
> I still get the same runtime warning with this patch set at boot time.
> 
> The bad address is within the kernel so it looks like
> it's catching a real bug.
> 
> cat kallsyms | grep f0007000
> f0007000 T trapbase_cpu3
> 
> WARNING: at lib/dma-debug.c:873 check_for_illegal_area+0xc8/0x100()
> esp ffd7ba30: DMA-API: device driver maps memory from kernel text or 
> rodata [addr=f0007000] [len=4096]
> Modules linked in: ext3 jbd sd_mod sun_esp esp_scsi scsi_transport_spi 

Ok, I looked at check_for_illegal_area() in dma-debug.

What check_for_illegal_area() does looks bogus to me with some of I/O
remapping hardware.


> scsi_mod
> [f011ffa0 : check_for_illegal_area+0xc8/0x100 ]
> [f0120b1c : debug_dma_map_sg+0x158/0x1c4 ]
> [fe6946d0 : sbus_esp_map_sg+0xec/0xfc [sun_esp] ]
> [fe684454 : esp_maybe_execute_command+0x1f0/0x6f8 [esp_scsi] ]
> [fe6849e4 : esp_queuecommand+0x88/0x98 [esp_scsi] ]
> [fe638c00 : scsi_dispatch_cmd+0x200/0x2a8 [scsi_mod] ]
> [fe63f038 : scsi_request_fn+0x3f4/0x52c [scsi_mod] ]
> [f00f6d64 : __generic_unplug_device+0x40/0x50 ]
> [f00f6d90 : generic_unplug_device+0x1c/0x38 ]
> [f00f4be4 : blk_unplug+0x14/0x24 ]
> [f00ade1c : sync_buffer+0x48/0x60 ]
> [f01f6d58 : __wait_on_bit+0x4c/0xa4 ]
> [f01f6e60 : out_of_line_wait_on_bit+0xb0/0xc0 ]
> [fe709320 : __ext3_get_inode_loc+0x3bc/0x418 [ext3] ]
> [fe7093b4 : ext3_iget+0x38/0x65c [ext3] ]
> [fe712c70 : ext3_get_journal+0xc/0xd4 [ext3] ]
> 
> --
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