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D1983.1781217418.diff
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Index: head/sys/x86/include/apicvar.h
===================================================================
--- head/sys/x86/include/apicvar.h
+++ head/sys/x86/include/apicvar.h
@@ -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

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