From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: devicetree-discuss@ozlabs.org, "Hans J. Koch" <hjk@linutronix.de>,
linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
Greg KH <gregkh@suse.de>
Subject: Re: [PATCH 2/2] uio: add an of_genirq driver
Date: Mon, 15 Jun 2009 09:44:49 +0100 [thread overview]
Message-ID: <20090615094449.04b029f0@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <20090614234546.GJ3639@local>
> I did it that way because I saw IRQ 0 in /proc/interrupts on every PC...
>
> >
> > It is the job of the platform to map a physical IRQ 0 to some other
> > representation if it exists outside of arch specific code.
>
> Funny.
>
> > This was
> > decided some years ago and a large part of the kernel simply doesn't
> > support any notion of a real IRQ 0.
>
> Can you tell me the reason for that decision or point me to some ml archive?
The natural C way to write "No xxx" is if (!xxx) hence
if (!dev->irq) {
polling_start();
return 0;
}
The PC "IRQ 0" is the timer - which only appears in the arch code.
Alan
next prev parent reply other threads:[~2009-06-15 8:44 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-12 0:04 [PATCH 0/2] add OF wrapper for uio-pdrv-genirq Wolfram Sang
[not found] ` <1244765062-14144-1-git-send-email-w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2009-06-12 0:04 ` [PATCH 1/2] uio/pdrv_genirq: Refactor probe routine to expose a generic part Wolfram Sang
2009-06-14 12:15 ` Hans J. Koch
2009-06-12 0:04 ` [PATCH 2/2] uio: add an of_genirq driver Wolfram Sang
2009-06-14 12:21 ` Hans J. Koch
2009-06-14 17:14 ` Wolfram Sang
[not found] ` <20090614171406.GA1010-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2009-06-14 18:33 ` Hans J. Koch
2009-06-14 19:05 ` Wolfram Sang
[not found] ` <20090614190533.GA7387-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2009-06-14 19:23 ` Hans J. Koch
2009-06-14 19:36 ` Wolfgang Grandegger
[not found] ` <4A355155.4020500-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
2009-06-14 20:34 ` Hans J. Koch
2009-06-14 22:00 ` Wolfram Sang
[not found] ` <20090614220022.GB24323-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2009-06-14 23:01 ` Hans J. Koch
2009-06-14 23:46 ` Wolfram Sang
[not found] ` <20090614234643.GA17791-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2009-06-14 23:50 ` Hans J. Koch
2009-06-14 19:27 ` Greg KH
[not found] ` <20090614192707.GA11003-l3A5Bk7waGM@public.gmane.org>
2009-06-14 21:46 ` Wolfram Sang
2009-06-14 23:12 ` Alan Cox
[not found] ` <20090615001207.1829e7b5-qBU/x9rampVanCEyBjwyrvXRex20P6io@public.gmane.org>
2009-06-14 23:45 ` Hans J. Koch
2009-06-15 8:44 ` Alan Cox [this message]
2009-06-15 9:45 ` Benjamin Herrenschmidt
[not found] ` <1244765062-14144-3-git-send-email-w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2009-06-14 14:40 ` Grant Likely
[not found] ` <fa686aa40906140740m43e9dd8am4d242310f681c95c-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2009-06-16 9:04 ` Wolfram Sang
2009-06-16 12:46 ` Grant Likely
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20090615094449.04b029f0@lxorguk.ukuu.org.uk \
--to=alan@lxorguk.ukuu.org.uk \
--cc=devicetree-discuss@ozlabs.org \
--cc=gregkh@suse.de \
--cc=hjk@linutronix.de \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@ozlabs.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox