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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
	Arjan van de Ven <arjan@infradead.org>,
	Ingo Molnar <mingo@elte.hu>,
	linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Andi Kleen <ak@suse.de>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [RFC] killing the NR_IRQS arrays.
Date: Thu, 01 Mar 2007 11:47:27 +0100	[thread overview]
Message-ID: <1172746048.11949.103.camel@localhost.localdomain> (raw)
In-Reply-To: <m1649mie1c.fsf@ebiederm.dsl.xmission.com>


> > Similarly, in a pci device, one could imagine that the
> > struct pci_driver contains a irq_handler_t member that
> > is registered from the pci_device_probe() function
> > if present.
> 
> Yes.  There is some potential there.  Although we would have to go
> through an extra hoop to make it a pci specific handler type.

Beware with that approach though. If you are on a shared IRQ line, when
do you start getting called when an IRQ happen (possibly for the "other"
device) ? As soon as you are bound to the device ? But that means
potentially before the driver internal data structures are fully
initialized...

I like the driver having in control the "hooking" of the irq handler,
thus, when it starts being capable of handling interrupts (even if they
aren't initiated by that driver's device).




  reply	other threads:[~2007-03-01 11:02 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-16 12:10 [RFC] killing the NR_IRQS arrays Eric W. Biederman
2007-02-16 12:16 ` Andi Kleen
2007-02-16 15:35   ` Eric W. Biederman
2007-02-16 12:41 ` Ingo Molnar
2007-02-16 15:23   ` Eric W. Biederman
2007-02-16 15:49   ` Eric W. Biederman
2007-02-16 22:33   ` Benjamin Herrenschmidt
2007-02-18 21:24   ` Arjan van de Ven
2007-02-19  0:25     ` Benjamin Herrenschmidt
2007-02-27 20:29       ` Eric W. Biederman
2007-02-28  0:41         ` Arnd Bergmann
2007-02-28  7:20           ` Eric W. Biederman
2007-02-28  8:09             ` Benjamin Herrenschmidt
2007-02-28 13:28               ` Eric W. Biederman
2007-02-28 12:24             ` Arnd Bergmann
2007-02-28 13:02               ` Segher Boessenkool
2007-02-28 13:53               ` Eric W. Biederman
2007-03-01 10:47                 ` Benjamin Herrenschmidt [this message]
2007-02-16 18:07 ` Jeremy Fitzhardinge
2007-02-16 19:01   ` Eric W. Biederman
2007-02-16 19:06     ` Jeremy Fitzhardinge
2007-02-16 19:45 ` Arnd Bergmann
2007-02-16 19:52   ` Russell King
2007-02-16 20:43     ` Arnd Bergmann
2007-02-16 20:59       ` Russell King
2007-02-16 22:37     ` Benjamin Herrenschmidt
2007-02-17  1:37       ` Arnd Bergmann
2007-02-17  4:00         ` Benjamin Herrenschmidt
2007-02-17  9:06           ` Eric W. Biederman
2007-02-17 21:15             ` Benjamin Herrenschmidt
2007-02-18  6:30               ` Eric W. Biederman
2007-02-18 20:01                 ` Benjamin Herrenschmidt
2007-02-17  9:34     ` Eric W. Biederman
2007-02-17 21:20       ` Benjamin Herrenschmidt
2007-02-18  3:58         ` Eric W. Biederman
2007-02-16 22:29 ` Benjamin Herrenschmidt
2007-02-17  8:51   ` Eric W. Biederman
2007-02-17 21:04     ` Benjamin Herrenschmidt
2007-02-18  4:58       ` Eric W. Biederman
2007-02-18 19:58         ` Benjamin Herrenschmidt

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