From: Thomas Gleixner <tglx@linutronix.de>
To: Taichi Kageyama <t-kageyama@cp.jp.nec.com>
Cc: Peter Hurley <peter@hurleysoftware.com>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"jiang.liu@linux.intel.com" <jiang.liu@linux.intel.com>,
"linux-serial@vger.kernel.org" <linux-serial@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"jslaby@suse.cz" <jslaby@suse.cz>,
"prarit@redhat.com" <prarit@redhat.com>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [RFC PATCH v2 0/3] genirq, serial: 8250: Workaround to avoid irq=0 for console
Date: Sun, 2 Aug 2015 11:52:53 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.11.1508021150520.3825@nanos> (raw)
In-Reply-To: <55BB1D82.909@cp.jp.nec.com>
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
prev parent reply other threads:[~2015-08-02 9:52 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-29 8:12 [RFC PATCH v2 0/3] genirq, serial: 8250: Workaround to avoid irq=0 for console Taichi Kageyama
2015-07-29 8:12 ` [RFC PATCH v2 1/3] serial: 8250: Fix autoconfig_irq() to avoid race conditions Taichi Kageyama
2015-08-06 12:53 ` Peter Hurley
2015-07-29 8:12 ` [RFC PATCH v2 2/3] genirq: Add a function to set irq affinity of candidate IRQs Taichi Kageyama
2015-07-29 8:13 ` [RFC PATCH v2 3/3] serial: 8250: Fix autoconfig_irq() to reduce the risk of failure Taichi Kageyama
2015-07-29 10:32 ` [RFC PATCH v2 0/3] genirq, serial: 8250: Workaround to avoid irq=0 for console Thomas Gleixner
2015-07-29 11:51 ` Peter Hurley
2015-07-29 11:53 ` Thomas Gleixner
2015-07-29 13:17 ` Peter Hurley
2015-07-29 13:35 ` Thomas Gleixner
2015-07-30 1:41 ` Taichi Kageyama
2015-07-30 10:12 ` Thomas Gleixner
2015-07-30 13:43 ` Peter Hurley
2015-07-30 22:12 ` Thomas Gleixner
2015-07-30 23:43 ` Peter Hurley
2015-07-31 7:02 ` Taichi Kageyama
2015-08-02 9:52 ` Thomas Gleixner [this message]
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