linux-kernel - Re: [PATCH] x86/sfi: fix ioapic gsi range

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Message-ID: <20100608091012.034f1cca@lxorguk.ukuu.org.uk>
Date:	Tue, 8 Jun 2010 09:10:12 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	Alan Cox <alan@...ux.intel.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Feng Tang <feng.tang@...el.com>,
	Len Brown <len.brown@...el.com>
Subject: Re: [PATCH] x86/sfi: fix ioapic gsi range

> > You may not use a 1-1 mapping if you don't have legacy irqs.  Linux
> > irqs 0-15 are the ISA irqs you may not use those irq numbers for

Linux IRQ 0 is "no IRQ assigned", except buried in certain bits of arch
specific historical knowledge.

Also calling 1-15 ISA IRQ lines is also somewhat misleading given they
are almost certainly routing for PCI devices. "PIC IRQ routing" maybe -
but even that is not really true on a lot of PC hardware today except by
convention.
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