linux-kernel - Re: Multiple MSI

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Message-Id: <1215085266.19689.19.camel@pasglop>
Date:	Thu, 03 Jul 2008 21:41:06 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Arnd Bergmann <arnd@...db.de>, michaele@....ibm.com,
	linux-pci@...r.kernel.org,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Miller <davem@...emloft.net>,
	Dan Williams <dan.j.williams@...el.com>,
	Martine.Silbermann@...com, linux-kernel@...r.kernel.org
Subject: Re: Multiple MSI

On Thu, 2008-07-03 at 05:31 -0600, Matthew Wilcox wrote:
> On Thu, Jul 03, 2008 at 07:17:00PM +1000, Benjamin Herrenschmidt wrote:
> > > Some years ago, we had discussions about getting rid of IRQ numbers
> > > altogether, or at least the requirement to have device drivers know
> > > about them. Does anyone remember what happened to that idea?
> > 
> > I think it's not totally dead. Last I heard, someone (jgarzik ?) was
> > slowly, bit by bit, removing the dependencies on the irq argument on irq
> > handlers which is one step in the direction.
> 
> I think that project's dead, Jim.  http://lkml.org/lkml/2008/4/22/578

Ouch, missed that one... sad, would have been a good idea in the long
run. irq_desc array is a big PITA.

> You can't do that.  /proc/interrupts is so terribly useful for a
> sysadmin that you can't remove information from it.

You can create a new one with informations about the new stuff..

Anyway, looks like it's not happening and we'll be stuck with the bloody
array for the time being. Crap.

Ben.


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