dummy irq trace 'Flags mismatch'

[Dave Jones]

When set to built-in, the dummy irq driver causes this trace when I boot..

[    3.996055] genirq: Flags mismatch irq 0. 00000080 (dummy_irq) vs. 00015a20 (timer)
[    3.997055] Pid: 1, comm: swapper/0 Not tainted 3.9.0+ #29
[    3.997768] Call Trace:
[    3.998127]  [<ffffffff810f8635>] __setup_irq+0x515/0x550
[    3.998827]  [<ffffffff81f00e8c>] ? loop_init+0x150/0x150
[    3.999530]  [<ffffffff8146adf0>] ? transfer_xor+0x160/0x160
[    4.000259]  [<ffffffff810f8809>] request_threaded_irq+0xf9/0x1a0
[    4.001041]  [<ffffffff81f00e8c>] ? loop_init+0x150/0x150
[    4.001740]  [<ffffffff81f00eb8>] dummy_irq_init+0x2c/0x60
[    4.002450]  [<ffffffff810002e2>] do_one_initcall+0x122/0x170
[    4.003191]  [<ffffffff81ecef5c>] kernel_init_freeable+0x15b/0x1db
[    4.003978]  [<ffffffff81ece7da>] ? do_early_param+0x88/0x88
[    4.004710]  [<ffffffff816a87e0>] ? rest_init+0x140/0x140
[    4.005413]  [<ffffffff816a87ee>] kernel_init+0xe/0x180
[    4.006094]  [<ffffffff816ce91c>] ret_from_fork+0x7c/0xb0
[    4.006789]  [<ffffffff816a87e0>] ? rest_init+0x140/0x140
[    4.007561] dummy-irq: cannot register IRQ 0

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