From: Takashi Iwai <tiwai@suse.de>
To: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
axboe@kernel.dk, cbou@mail.ru, davem@davemloft.net, dtor@mail.ru,
dwmw2@infradead.org, grant.likely@secretlab.ca,
gregkh@linuxfoundation.org, jkosina@suse.cz, jslaby@suse.cz,
khali@linux-fr.org, mchehab@redhat.com, perex@perex.cz,
sameo@linux.intel.com, w.sang@pengutronix.de,
linux-kernel@vger.kernel.org, sebott@linux.vnet.ibm.com,
gerald.schaefer@de.ibm.com, schwidefsky@de.ibm.com
Subject: Re: [PATCH 12/15] sound: add missing HAS_IOPORT and GENERIC_HARDIRQS dependencies
Date: Thu, 07 Feb 2013 14:39:04 +0100 [thread overview]
Message-ID: <s5h4nho6y6f.wl%tiwai@suse.de> (raw)
In-Reply-To: <20130207133206.GB3929@osiris>
At Thu, 7 Feb 2013 14:32:06 +0100,
Heiko Carstens wrote:
>
> On Wed, Feb 06, 2013 at 09:56:55PM +0000, Arnd Bergmann wrote:
> > On Wednesday 06 February 2013, Heiko Carstens wrote:
> > > On Wed, Feb 06, 2013 at 06:26:02PM +0100, Takashi Iwai wrote:
> > > > At Thu, 07 Feb 2013 02:13:19 +0100,
> > > > Arnd Bergmann wrote:
> > > > > Why not just make CONFIG_GENERIC_HARDIRQS mandatory for all
> > > > > platforms. It is use almost everywhere now.
> > > >
> > > > I wonder it, too...
> > >
> > > I haven't looked into it, but I doubt if that is possible without large
> > > effort, if at all. s390 doesn't have any irq chips, nor something like
> > > edge or level triggered irqs.
> > > Instead we have floating interrupts. Does that fit into the concept of
> > > GENERIC_HARDIRQS at all?
> > > If so, we can give it a try, sure. But that won't happen any time soon.
> > >
> > > Or are you simply proposing we should have both, our own irq handling plus
> > > GENERIC_HARDIRQS with dummy functions?
> >
> > I think you should use GENERIC_HARDIRQ just for PCI, and rename the s390
> > interrupt handling to something that does not conflict. I understand
> > that the concepts are quite different, but with PCI support, you actually
> > do get all the weird interrupt hardware.
> > More importantly, some features provided by GENERIC_HARDIRQ are replacing
> > the traditional interfaces now, e.g. devm_request_irq() is actually
> > recommended over request_irq() for normal drivers these days, as it
> > simplifies the error handling.
>
> That sounds reasonable. And a quick grep seems to indicate that s390
> is the last architecture with !GENERIC_HARDIRQS.
> However having two completely different IRQ subsystems within one
> architecture will bring up some interesting questions like e.g.
> how should /proc/interrupts look like? Or /proc/stat:intr ?
>
> Jan considered turning GENERIC_HARDIRQS on for PCI support, but didn't.
> I don't know why he didn't and since he left, we can't ask him anymore.
>
> So for the time being I'd appreciate it if we can simply add the
> additional GENERIC_HARDIRQS dependencies where needed, since I consider
> a working allmodconfig quite important.
> Later on we should indeed try to switch to GENERIC_HARDIRQS and then
> git rid of that config option completely. However I leave that to
> Sebastian and Gerald who now take care of our PCI code ;)
OK, then I'll queue the sound patch to sound.git tree as is.
If things get easier, let's fix them later.
thanks,
Takashi
next prev parent reply other threads:[~2013-02-07 13:39 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-06 16:23 [PATCH 00/15] Add various missing GENERIC_HARDIRQS dependencies Heiko Carstens
2013-02-06 16:23 ` [PATCH 01/15] drivers/input: add couple of " Heiko Carstens
2013-02-14 4:22 ` Dmitry Torokhov
2013-02-06 16:23 ` [PATCH 02/15] drivers/i2c: remove !S390 dependency, add " Heiko Carstens
2013-02-06 16:23 ` [PATCH 03/15] drivers/mfd: add missing GENERIC_HARDIRQS dependecies Heiko Carstens
2013-02-07 7:39 ` Samuel Ortiz
2013-02-06 16:23 ` [PATCH 04/15] drivers/block/mtip32xx: add missing GENERIC_HARDIRQS dependency Heiko Carstens
2013-02-07 6:35 ` Jens Axboe
2013-02-06 16:23 ` [PATCH 05/15] drivers/dma/dw_dmac: " Heiko Carstens
2013-02-06 16:23 ` [PATCH 06/15] drivers/gpio: add missing GENERIC_HARDIRQ dependency Heiko Carstens
2013-02-06 16:23 ` [PATCH 07/15] drivers/hid: " Heiko Carstens
2013-02-07 10:37 ` Jiri Kosina
2013-02-06 16:23 ` [PATCH 08/15] drivers/misc/cb710: add missing GENERIC_HARDIRQS dependency Heiko Carstens
2013-02-08 20:23 ` Greg KH
2013-02-08 20:23 ` Greg KH
2013-02-06 16:23 ` [PATCH 09/15] drivers/media: add missing GENERIC_HARDIRQS dependencies Heiko Carstens
2013-02-07 14:01 ` Mauro Carvalho Chehab
2013-02-06 16:23 ` [PATCH 10/15] drivers/net,AT91RM9200: add missing GENERIC_HARDIRQS dependency Heiko Carstens
2013-02-06 21:12 ` David Miller
2013-02-06 16:23 ` [PATCH 11/15] drivers/spi: add missing GENERIC_HARDIRQS dependencies Heiko Carstens
2013-02-06 16:24 ` [PATCH 12/15] sound: add missing HAS_IOPORT and " Heiko Carstens
2013-02-06 17:05 ` Takashi Iwai
2013-02-07 1:13 ` Arnd Bergmann
2013-02-06 17:26 ` Takashi Iwai
2013-02-06 18:12 ` Heiko Carstens
2013-02-06 21:56 ` Arnd Bergmann
2013-02-07 13:32 ` Heiko Carstens
2013-02-07 13:36 ` Arnd Bergmann
2013-02-07 13:39 ` Takashi Iwai [this message]
2013-02-13 21:34 ` Dmitry Torokhov
2013-02-06 16:24 ` [PATCH 13/15] drivers/usb: add missing " Heiko Carstens
2013-02-06 16:24 ` [PATCH 14/15] drivers/power,goldfisch battery: add missing GENERIC_HARDIRQS dependency Heiko Carstens
2013-02-16 21:24 ` Anton Vorontsov
2013-02-06 16:24 ` [PATCH 15/15] drivers/serial: add " Heiko Carstens
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