Date: Tue, 8 Jun 2010 09:10:12 +0100
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
       Jacob Pan <jacob.jun.pan@linux.intel.com>,
       Alan Cox <alan@linux.intel.com>,
       Arjan van de Ven <arjan@linux.intel.com>,
       LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
       Feng Tang <feng.tang@intel.com>, Len Brown <len.brown@intel.com>
Subject: Re: [PATCH] x86/sfi: fix ioapic gsi range
Message-ID: <20100608091012.034f1cca@lxorguk.ukuu.org.uk>
In-Reply-To: <4C0D8F43.4070900@zytor.com>
References: <1275952044-27996-1-git-send-email-jacob.jun.pan@linux.intel.com>
	<m1631ue5ho.fsf@fess.ebiederm.org>
	<4C0D8F43.4070900@zytor.com>
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> > 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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