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From: ebiederm@xmission.com (Eric W. Biederman)
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Russell King <rmk+lkml@arm.linux.org.uk>,
	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>, Ingo Molnar <mingo@elte.hu>,
	Alan Cox <alan@lxorguk.ukuu.org.uk>,
	Arnd Bergmann <arnd@arndb.de>
Subject: Re: [RFC] killing the NR_IRQS arrays.
Date: Sat, 17 Feb 2007 20:58:26 -0700	[thread overview]
Message-ID: <m1zm7c9kwt.fsf@ebiederm.dsl.xmission.com> (raw)
In-Reply-To: <1171747222.5644.143.camel@localhost.localdomain> (Benjamin Herrenschmidt's message of "Sun, 18 Feb 2007 08:20:22 +1100")

Benjamin Herrenschmidt <benh@kernel.crashing.org> writes:

>
>> We might need this.  But I don't think we need reference counting in
>> the traditional sense.  For all practical purpose we already have
>> dynamic irq allocation and it hasn't proven necessary.  I would
>> prefer to go to lengths to avoid having to expose that kind of
>> an issue to driver code.
>
> I think we do need proper refcounting, but I also think that most
> drivers will not need to see it.
>
> For example, a PCI driver will most probably just do something along the
> lines of the existing request_irq(pdev->irq), the liftime of pdev->irq
> is managed by the PCI core.
>
> Same goes with MSIs imho, the MSI core can manage the lifetime
> transparently.

Yes.  I'm optimistic that we won't find a case where refcounting will
be needed.

Eric

  reply	other threads:[~2007-02-18  3:59 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
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 [this message]
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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