note safety (discussed with art)

1 files changed, 5 insertions, 3 deletions

diff --git a/share/man/man9/bus_dma.9 b/share/man/man9/bus_dma.9
index 989d2bea693..4b26cc789ca 100644
--- a/share/man/man9/bus_dma.9
+++ b/share/man/man9/bus_dma.9
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: bus_dma.9,v 1.4 2001/06/28 22:14:23 millert Exp $ 
+.\"	$OpenBSD: bus_dma.9,v 1.5 2001/06/29 02:10:05 jason Exp $ 
 .\" $NetBSD: bus_dma.9,v 1.14 2000/06/14 06:49:19 cgd Exp $
 .\"
 .\" Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
@@ -645,7 +645,8 @@ placed into the DMA map for use by later calls to
 .El
 .Pp
 Behavior is undefined if invalid arguments are passed to
-.Fn bus_dmamem_map .
+.Fn bus_dmamem_map 
+and must not be called from an interrupt context.
 .Pp
 Returns 0 on success, or an error code indicating mode of failure.
 .It Fn bus_dmamem_unmap "tag" "kva" "size"
@@ -664,7 +665,8 @@ The size of the mapping.
 .El
 .Pp
 Behavior is undefined if invalid arguments are passed to
-.Fn bus_dmamem_unmap .
+.Fn bus_dmamem_unmap
+and must not be call from an interrupt context.
 .Pp
 If given valid arguments,
 .Fn bus_dmamem_unmap