sparc32 dma-debug found bug?

sparc32 dma-debug found bug?

[Robert Reif]

I have the latest dma debug patches from FUJITA Tomonori
and http://patchwork.kernel.org/patch/33866/ running on
sparc32 and it looks like it might have found an issue at
boot time:

WARNING: at lib/dma-debug.c:874 check_for_illegal_area+0x174/0x1ac()
esp ffd7ba30: DMA-API: device driver maps memory from kernel text or 
rodata [addrð007000] [size@96]
Modules linked in: ext3 jbd sd_mod sun_esp esp_scsi scsi_transport_spi 
scsi_mod
[f01200ec : check_for_illegal_area+0x174/0x1ac ]
[f0120c6c : debug_dma_map_sg+0x15c/0x1c8 ]
[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] ]
[f00f6e28 : __generic_unplug_device+0x40/0x50 ]
[f00f6e54 : generic_unplug_device+0x1c/0x38 ]
[f00f4ca8 : blk_unplug+0x14/0x24 ]
[f00adf10 : sync_buffer+0x48/0x60 ]
[f01f7184 : __wait_on_bit+0x4c/0xa4 ]
[f01f728c : 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] ]

f0007000 in kallsyms is:

f0007000 T trapbase_cpu3

which matches the error message.

Re: sparc32 dma-debug found bug?

[FUJITA Tomonori]

On Tue, 07 Jul 2009 19:40:09 -0400
Robert Reif <reif@earthlink.net> wrote:

> I have the latest dma debug patches from FUJITA Tomonori
> and http://patchwork.kernel.org/patch/33866/ running on
> sparc32 and it looks like it might have found an issue at
> boot time:

I've not read the thread but the above patch seems totally wrong.

Seems that Ingo merged the fix to mainline (commit
f39d1b9792881ce4eb982ec8cc65258bf95674b5).

I've just submitted the second version and uploaded the git tree
(against the latest git):

git://git.kernel.org/pub/scm/linux/kernel/git/tomo/linux-2.6-misc.git sparc