linux-kernel - Re: [PATCH 3/3] x86: when acpi_noirq is set, use mptable instead of MADT

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Message-Id: <200611270037.53964.len.brown@intel.com>
Date:	Mon, 27 Nov 2006 00:37:53 -0500
From:	Len Brown <len.brown@...el.com>
To:	"Yinghai Lu" <yinghai.lu@....com>
Cc:	"Andrew Morton" <akpm@...l.org>, "Andi Kleen" <ak@....de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] x86: when acpi_noirq is set, use mptable instead of MADT

"acpi=noirq" and "pci=noacpi" are not reliable in IOAPIC mode --
as, by definition, they skip the processing of the ACPI interrupt itself.
On some systems this happens to work, and on some systems it doesn't --
depends on if there was an override for the SCI or if it appears as
a standard PCI interrupt.

So the bigger question is why you need these workarounds in the first place.

-Len

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