svn commit: r192305 - head/sys/kern

Robert Watson rwatson at FreeBSD.org
Mon May 18 14:02:57 UTC 2009


Author: rwatson
Date: Mon May 18 14:02:55 2009
New Revision: 192305
URL: http://svn.freebsd.org/changeset/base/192305

Log:
  Binding interrupts to a CPU consists of two parts: setting up CPU
  affinity for the interrupt thread, and requesting that underlying
  hardware direct interrupts to the CPU.  For software interrupt
  threads, implement a no-op interrupt event binder that returns
  success, so that the interrupt management code will just set the
  ithread's affinity and succeed.
  
  Reviewed by:	jhb
  MFC after:	1 week

Modified:
  head/sys/kern/kern_intr.c

Modified: head/sys/kern/kern_intr.c
==============================================================================
--- head/sys/kern/kern_intr.c	Mon May 18 12:03:43 2009	(r192304)
+++ head/sys/kern/kern_intr.c	Mon May 18 14:02:55 2009	(r192305)
@@ -968,6 +968,18 @@ intr_event_schedule_thread(struct intr_e
 #endif
 
 /*
+ * Allow interrupt event binding for software interrupt handlers -- a no-op,
+ * since interrupts are generated in software rather than being directed by
+ * a PIC.
+ */
+static int
+swi_assign_cpu(void *arg, u_char cpu)
+{
+
+	return (0);
+}
+
+/*
  * Add a software interrupt handler to a specified event.  If a given event
  * is not specified, then a new event is created.
  */
@@ -988,7 +1000,7 @@ swi_add(struct intr_event **eventp, cons
 			return (EINVAL);
 	} else {
 		error = intr_event_create(&ie, NULL, IE_SOFT, 0,
-		    NULL, NULL, NULL, NULL, "swi%d:", pri);
+		    NULL, NULL, NULL, swi_assign_cpu, "swi%d:", pri);
 		if (error)
 			return (error);
 		if (eventp != NULL)


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