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From: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Date: Tue, 8 Dec 2009 05:23:08 +0000 (UTC)
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Subject: svn commit: r200248 - stable/8/sys/powerpc/powermac
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Author: nwhitehorn
Date: Tue Dec  8 05:23:07 2009
New Revision: 200248
URL: http://svn.freebsd.org/changeset/base/200248

Log:
  MFC r198444:
  
  Allow Heathrow-based machines to boot a kernel containing option SMP
  without panicing.

Modified:
  stable/8/sys/powerpc/powermac/hrowpic.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)
  stable/8/sys/dev/xen/xenpci/   (props changed)

Modified: stable/8/sys/powerpc/powermac/hrowpic.c
==============================================================================
--- stable/8/sys/powerpc/powermac/hrowpic.c	Tue Dec  8 05:18:59 2009	(r200247)
+++ stable/8/sys/powerpc/powermac/hrowpic.c	Tue Dec  8 05:23:07 2009	(r200248)
@@ -182,7 +182,13 @@ hrowpic_toggle_irq(struct hrowpic_softc 
 	u_int roffset;
 	u_int rbit;
 
-	KASSERT((irq > 0) && (irq < HROWPIC_IRQMAX), ("en irq out of range"));
+	KASSERT((irq > 0) && (irq <= HROWPIC_IRQMAX), ("en irq out of range"));
+
+	/*
+	 * Humor the SMP layer if it wants to set up an IPI handler.
+	 */
+	if (irq == HROWPIC_IRQMAX)
+		return;
 
 	/*
 	 * Calculate prim/sec register bank for the IRQ, update soft copy,