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SubjectBadness in as_completed_request warning

I'm getting a "badness" warning from as_iosched.c, line 917.
This is on 2.6.0-test4-mm6, running on a 2 cpu x86.

The warning occurs when I run three or more instances of mkfs.ext2, where
each mkfs is running on its own disk. If I run four or more mkfs's
on paritions all on the same disk I don't get this warning.
The more instances of mkfs I run (each on separate disks), the
more instances of this warning I receive.

The mkfs's all progress at the same rate. The warnings
occur as all mkfs's are "writing superblocks and filesystem
accounting information", near the end of the mkfs.

# Badness in as_completed_request at drivers/block/as-iosched.c:917

Call Trace:
[<c0220d0d>] as_completed_request+0x1ad/0x1b0
[<c021946f>] elv_completed_request+0x1f/0x30
[<c021b87c>] __blk_put_request+0x3c/0xc0
[<c021c83f>] end_that_request_last+0x5f/0xf0
[<c0234d02>] DAC960_V2_ProcessCompletedCommand+0x172/0xf50
[<c029712a>] ip_rcv+0x39a/0x520
[<c011ebf4>] recalc_task_prio+0xb4/0x1f0
[<c011f64b>] load_balance+0x1bb/0x430
[<c0235bfd>] DAC960_LP_InterruptHandler+0x6d/0xb0
[<c010e789>] handle_IRQ_event+0x49/0x80
[<c010eb00>] do_IRQ+0xa0/0x150
[<c010abd0>] default_idle+0x0/0x40
[<c02f2f8c>] common_interrupt+0x18/0x20
[<c010abd0>] default_idle+0x0/0x40
[<c010abfd>] default_idle+0x2d/0x40
[<c010ac96>] cpu_idle+0x46/0x50
[<c0107000>] rest_init+0x0/0x60
[<c039092d>] start_kernel+0x18d/0x1c0
[<c03904a0>] unknown_bootoption+0x0/0x120

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