[src/trunk]: src/sys/sys Use M_BUFADDR to dedup code in M_LEADINGSPACE.

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

details:   https://anonhg.NetBSD.org/src/rev/bb68ab2ca042
branches:  trunk
changeset: 965585:bb68ab2ca042
user:      maxv <maxv%NetBSD.org@localhost>
date:      Mon Sep 23 08:04:35 2019 +0000

description:
Use M_BUFADDR to dedup code in M_LEADINGSPACE.

diffstat:

 sys/sys/mbuf.h |  13 ++++---------
 1 files changed, 4 insertions(+), 9 deletions(-)

diffs (29 lines):

diff -r bc531b603bbc -r bb68ab2ca042 sys/sys/mbuf.h
--- a/sys/sys/mbuf.h    Mon Sep 23 07:47:45 2019 +0000
+++ b/sys/sys/mbuf.h    Mon Sep 23 08:04:35 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: mbuf.h,v 1.221 2019/09/18 16:18:12 maxv Exp $  */
+/*     $NetBSD: mbuf.h,v 1.222 2019/09/23 08:04:35 maxv Exp $  */
 
 /*
  * Copyright (c) 1996, 1997, 1999, 2001, 2007 The NetBSD Foundation, Inc.
@@ -537,16 +537,11 @@
        (((m)->m_flags & (M_EXT|M_EXT_ROMAP)) == (M_EXT|M_EXT_ROMAP))
 
 /*
- * Compute the amount of space available
- * before the current start of data in an mbuf.
+ * Compute the amount of space available before the current start of
+ * data in an mbuf.
  */
-#define _M_LEADINGSPACE(m)                                             \
-       ((m)->m_flags & M_EXT ? (m)->m_data - (m)->m_ext.ext_buf :      \
-        (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat :        \
-        (m)->m_data - (m)->m_dat)
-
 #define M_LEADINGSPACE(m)                                              \
-       (M_READONLY((m)) ? 0 : _M_LEADINGSPACE((m)))
+       (M_READONLY((m)) ? 0 : ((m)->m_data - M_BUFADDR(m)))
 
 /*
  * Compute the amount of space available