[src/trunk]: src/sys/arch/hppa/hppa Add a comment.

[skrll <skrll%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/69740dff5255
branches:  trunk
changeset: 752977:69740dff5255
user:      skrll <skrll%NetBSD.org@localhost>
date:      Sat Mar 13 16:17:59 2010 +0000

description:
Add a comment.

diffstat:

 sys/arch/hppa/hppa/pmap.c |  5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diffs (26 lines):

diff -r 09db21252a6d -r 69740dff5255 sys/arch/hppa/hppa/pmap.c
--- a/sys/arch/hppa/hppa/pmap.c Sat Mar 13 15:46:09 2010 +0000
+++ b/sys/arch/hppa/hppa/pmap.c Sat Mar 13 16:17:59 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pmap.c,v 1.70 2010/03/06 21:22:42 skrll Exp $  */
+/*     $NetBSD: pmap.c,v 1.71 2010/03/13 16:17:59 skrll Exp $  */
 
 /*-
  * Copyright (c) 2001, 2002 The NetBSD Foundation, Inc.
@@ -65,7 +65,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.70 2010/03/06 21:22:42 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.71 2010/03/13 16:17:59 skrll Exp $");
 
 #include "opt_cputype.h"
 
@@ -229,6 +229,7 @@
     pt_entry_t *);
 static bool __changebit(struct vm_page *, u_int, u_int);
 
+/* un-invert PVF_REF */
 #define pmap_pvh_attrs(a) \
        (((a) & (PVF_MOD|PVF_REF|PVF_WRITE|PVF_UNCACHEABLE)) ^ PVF_REF)