Re: [RFC PATCH v2 0/3] genirq, serial: 8250: Workaround to avoid irq=0 for console

[Thomas Gleixner]

On Fri, 31 Jul 2015, Taichi Kageyama wrote:
> On 2015/07/31 8:43, Peter Hurley wrote:
> >> If you look at the actual autoprobe users aside of 8250. That's really
> >> all ancient ISA hardware and hardly interesting. So all we really care
> >> about are the 8250 serial ports.
> 
> In this case, I think [patch v2 1/3] is enough.
> console_lock is required in autoconfig_irq() to resolve other race conditions
> before calling probe_irq_on().

Fine with me.
 
> >> So why are you interested in that serial irq autoprobe crap at all?
> > 
> Because RHEL6 uses CONFIG_SERIAL_8250_DETECT_IRQ=y unfortunately.

Doh!
 
> I already got the following console solutions after discussion with Peter.
>  - Force set irq before any APs and getty open /dev/console. 
>    Users have to know valid irq#.
>  - Fix FW to define PNP
>  - CONFIG_SERIAL_8250_DETECT_IRQ=n

Ack!

Thanks,

	tglx
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