linux-kernel - Re: [RFC] killing the NR

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Message-ID: <m1zm7c9kwt.fsf@ebiederm.dsl.xmission.com>
Date:	Sat, 17 Feb 2007 20:58:26 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Russell King <rmk+lkml@....linux.org.uk>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>, Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [RFC] killing the NR_IRQS arrays.

Benjamin Herrenschmidt <benh@...nel.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
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