On Fri, 31 Jul 2015, Taichi Kageyama wrote:

On 2015/07/31 8:43, Peter Hurley wrote:

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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.
 

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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