http://bugzilla.novell.com/show_bug.cgi?id=973748
http://bugzilla.novell.com/show_bug.cgi?id=973748#c3
--- Comment #3 from Jiri Slaby ---
Generally, =n can lead to errors like:
genirq: Flags mismatch irq 4. 00000000 (serial) vs. 00000080
(goldfish_pdev_bus)
CPU: 3 PID: 6626 Comm: init Tainted: G W 4.6.0-rc1+ #338
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
ffffffff87eb26a0 ffff88003da17618 ffffffff82c8ea9f ffffffff86f0c740
fffffbfff0fd64d4 ffff88003e8a6aa8 ffff88005eb4c4c8 00000000fffffff0
ffffffff874f6be0 ffff880034ae63a8 ffff88003da17708 ffffffff8149e73c
Call Trace:
[< inline >] __dump_stack lib/dump_stack.c:15
[<ffffffff82c8ea9f>] dump_stack+0x12e/0x18f lib/dump_stack.c:51
[<ffffffff8149e73c>] __setup_irq+0x11fc/0x1610 kernel/irq/manage.c:1369
[<ffffffff8149ef55>] request_threaded_irq+0x275/0x410 kernel/irq/manage.c:1652
[< inline >] request_irq include/linux/interrupt.h:147
[< inline >] serial_link_irq_chain
drivers/tty/serial/8250/8250_core.c:220
[<ffffffff830cc4bb>] univ8250_setup_irq+0x6fb/0x8a0
drivers/tty/serial/8250/8250_core.c:347
[<ffffffff830d6ec7>] serial8250_do_startup+0x537/0x18c0
drivers/tty/serial/8250/8250_port.c:2179
[<ffffffff830d82a9>] serial8250_startup+0x59/0x70
drivers/tty/serial/8250/8250_port.c:2288
[< inline >] uart_port_startup drivers/tty/serial/serial_core.c:163
[<ffffffff830c274b>] uart_startup.part.17+0x21b/0x640
drivers/tty/serial/serial_core.c:208
[< inline >] uart_startup drivers/tty/serial/serial_core.c:1627
[<ffffffff830c512e>] uart_open+0x31e/0x3c0
drivers/tty/serial/serial_core.c:1619
[<ffffffff83051608>] tty_open+0x2c8/0x1140 drivers/tty/tty_io.c:2131
[<ffffffff81805baa>] chrdev_open+0x22a/0x4c0 fs/char_dev.c:388
[<ffffffff817f1282>] do_dentry_open+0x6a2/0xcb0 fs/open.c:736
[<ffffffff817f495b>] vfs_open+0x17b/0x1f0 fs/open.c:853
[< inline >] do_last fs/namei.c:3238
[<ffffffff8182d1fb>] path_openat+0x51bb/0x5ce0 fs/namei.c:3374
[<ffffffff8183139e>] do_filp_open+0x18e/0x250 fs/namei.c:3409
[<ffffffff817f50dc>] do_sys_open+0x1fc/0x420 fs/open.c:1020
[< inline >] SYSC_open fs/open.c:1038
[<ffffffff817f532d>] SyS_open+0x2d/0x40 fs/open.c:1033
[<ffffffff867c6280>] entry_SYSCALL_64_fastpath+0x23/0xc1
arch/x86/entry/entry_64.S:207
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