linux-kernel - Re: [PATCH] pci: change msi-x vector to 32bit

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Message-ID: <20080816163945.74d487e9@lxorguk.ukuu.org.uk>
Date:	Sat, 16 Aug 2008 16:39:45 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Yinghai Lu <yhlu.kernel@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Andrew Vasquez <andrew.vasquez@...gic.com>
Subject: Re: [PATCH] pci: change msi-x vector to 32bit

> Where exactly is this code in the kernel?  Most arches assume the irq is
> an index to a compact table bounded by NR_IRQS, so something like this
> would violate that assumption.

Yes, which is no bad thing for some platforms. There are some driver
assumptions like that but those have also been stomped.

Alan
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