svn commit: r279468 - head/sys/x86/include

[Neel Natu]

Author: neel
Date: Sun Mar  1 02:31:27 2015
New Revision: 279468
URL: https://svnweb.freebsd.org/changeset/base/279468

Log:
  Free up the IPI slot used by IPI_STOP_HARD.
  
  Change the numeric value of IPI_STOP_HARD so it doesn't occupy a valid IPI
  slot. This can be done because IPI_STOP_HARD is actually delivered via NMI.
  
  Reviewed by:	kib
  Differential Revision:	https://reviews.freebsd.org/D1983

Modified:
  head/sys/x86/include/apicvar.h

Modified: head/sys/x86/include/apicvar.h
==============================================================================
--- head/sys/x86/include/apicvar.h	Sun Mar  1 01:08:14 2015	(r279467)
+++ head/sys/x86/include/apicvar.h	Sun Mar  1 02:31:27 2015	(r279468)
@@ -126,7 +126,12 @@
 
 #define	IPI_STOP	(APIC_IPI_INTS + 7)	/* Stop CPU until restarted. */
 #define	IPI_SUSPEND	(APIC_IPI_INTS + 8)	/* Suspend CPU until restarted. */
-#define	IPI_STOP_HARD	(APIC_IPI_INTS + 9)	/* Stop CPU with a NMI. */
+
+/*
+ * IPI_STOP_HARD does not need to occupy a slot in the IPI vector space since
+ * it is delivered using an NMI anyways.
+ */
+#define	IPI_STOP_HARD	255			/* Stop CPU with a NMI. */
 
 /*
  * The spurious interrupt can share the priority class with the IPIs since