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Subjectdummy irq trace 'Flags mismatch'
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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