Introduce intr_barrier(4), an interface that guarantees that an interrupt

handler that was running has finished.

ok miod@, guenther@ (both for the equivalent sparc64 diff)

2 files changed, 9 insertions, 2 deletions

diff --git a/sys/arch/amd64/amd64/intr.c b/sys/arch/amd64/amd64/intr.c
index 5ff654c0b6d..022ae1f15cb 100644
--- a/sys/arch/amd64/amd64/intr.c
+++ b/sys/arch/amd64/amd64/intr.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: intr.c,v 1.45 2015/08/28 16:16:44 tedu Exp $	*/
+/*	$OpenBSD: intr.c,v 1.46 2015/09/13 11:48:17 kettenis Exp $	*/
 /*	$NetBSD: intr.c,v 1.3 2003/03/03 22:16:20 fvdl Exp $	*/
 
 /*
@@ -653,6 +653,12 @@ intr_printconfig(void)
 #endif
 }
 
+void
+intr_barrier(void *ih)
+{
+	sched_barrier(NULL);
+}
+
 /*
  * Add a mask to cpl, and return the old value of cpl.
  */
diff --git a/sys/arch/amd64/include/intr.h b/sys/arch/amd64/include/intr.h
index d7d80134f73..5cf93934e3e 100644
--- a/sys/arch/amd64/include/intr.h
+++ b/sys/arch/amd64/include/intr.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: intr.h,v 1.28 2015/07/19 18:44:15 sf Exp $	*/
+/*	$OpenBSD: intr.h,v 1.29 2015/09/13 11:48:17 kettenis Exp $	*/
 /*	$NetBSD: intr.h,v 1.2 2003/05/04 22:01:56 fvdl Exp $	*/
 
 /*-
@@ -209,6 +209,7 @@ int intr_handler(struct intrframe *, struct intrhand *);
 void cpu_intr_init(struct cpu_info *);
 int intr_find_mpmapping(int bus, int pin, int *handle);
 void intr_printconfig(void);
+void intr_barrier(void *);
 
 #ifdef MULTIPROCESSOR
 void x86_send_ipi(struct cpu_info *, int);