linux-kernel - Re: Multiple MSI

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Message-ID: <20080704090803.545d52be@lxorguk.ukuu.org.uk>
Date:	Fri, 4 Jul 2008 09:08:03 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	michael@...erman.id.au
Cc:	benh@...nel.crashing.org, Matthew Wilcox <matthew@....cx>,
	Arnd Bergmann <arnd@...db.de>, 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

> In most cases that I can see the conversion from irq number to irq_desc
> is done in the genirq code, so I don't see why you couldn't just put a
> remapping in there from irq numbers to descs that doesn't use an array. 
> But maybe I'm missing something.

There are a pile of drivers you would also need to fix up that use NR_IRQ
sized tables. There is also the performance concern. The irq->desc
conversion has to be very fast.

It would be better (IMHO) if dev->irq and irq in general was a pointer
whose number for end users was irq->num or similar.
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