Groups > linux.kernel > #1198322

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

From	Thomas Gleixner <tglx@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH v2 0/3] genirq, serial: 8250: Workaround to avoid irq=0 for console
Date	2015-08-02 12:00 +0200
Message-ID	<pSYdI-ij-15@gated-at.bofh.it> (permalink)
References	(7 earlier) <pRT6r-3L6-27@gated-at.bofh.it> <pRWnF-8qz-5@gated-at.bofh.it> <pS4lb-3dJ-3@gated-at.bofh.it> <pS5Ki-56L-5@gated-at.bofh.it> <pScC5-6Jm-11@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

[RFC PATCH v2 0/3] genirq, serial: 8250: Workaround to avoid irq=0  for console Taichi Kageyama <t-kageyama@cp.jp.nec.com> - 2015-07-29 10:30 +0200
  [RFC PATCH v2 3/3] serial: 8250: Fix autoconfig_irq() to reduce the  risk of failure Taichi Kageyama <t-kageyama@cp.jp.nec.com> - 2015-07-29 10:30 +0200
  [RFC PATCH v2 2/3] genirq: Add a function to set irq affinity of  candidate IRQs Taichi Kageyama <t-kageyama@cp.jp.nec.com> - 2015-07-29 10:30 +0200
  Re: [RFC PATCH v2 0/3] genirq, serial: 8250: Workaround to avoid  irq=0 for console Peter Hurley <peter@hurleysoftware.com> - 2015-07-29 15:20 +0200
    Re: [RFC PATCH v2 0/3] genirq, serial: 8250: Workaround to avoid  irq=0 for console Thomas Gleixner <tglx@linutronix.de> - 2015-07-29 15:40 +0200
      Re: [RFC PATCH v2 0/3] genirq, serial: 8250: Workaround to avoid  irq=0 for console Taichi Kageyama <t-kageyama@cp.jp.nec.com> - 2015-07-30 03:50 +0200
        Re: [RFC PATCH v2 0/3] genirq, serial: 8250: Workaround to avoid  irq=0 for console Thomas Gleixner <tglx@linutronix.de> - 2015-07-30 12:20 +0200
          Re: [RFC PATCH v2 0/3] genirq, serial: 8250: Workaround to avoid  irq=0 for console Thomas Gleixner <tglx@linutronix.de> - 2015-08-02 12:00 +0200

csiph-web