[src/trunk]: src/sys/netinet Adapt previous, reintroduce MH_ALIGN. It's used ...

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

details:   https://anonhg.NetBSD.org/src/rev/b3a37c0cc1ad
branches:  trunk
changeset: 829204:b3a37c0cc1ad
user:      maxv <maxv%NetBSD.org@localhost>
date:      Mon Jan 22 06:56:25 2018 +0000

description:
Adapt previous, reintroduce MH_ALIGN. It's used as an optimization - we
can later prepend something to the current mbuf without having to allocate
a new mbuf.

diffstat:

 sys/netinet/ip_icmp.c |  7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diffs (28 lines):

diff -r 5037dd49ccb5 -r b3a37c0cc1ad sys/netinet/ip_icmp.c
--- a/sys/netinet/ip_icmp.c     Mon Jan 22 01:34:42 2018 +0000
+++ b/sys/netinet/ip_icmp.c     Mon Jan 22 06:56:25 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ip_icmp.c,v 1.163 2018/01/19 13:17:29 maxv Exp $       */
+/*     $NetBSD: ip_icmp.c,v 1.164 2018/01/22 06:56:25 maxv Exp $       */
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -94,7 +94,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ip_icmp.c,v 1.163 2018/01/19 13:17:29 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ip_icmp.c,v 1.164 2018/01/22 06:56:25 maxv Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_ipsec.h"
@@ -345,6 +345,9 @@
                panic("icmp_error");
        ICMP_STATINC(ICMP_STAT_OUTHIST + type);
 
+       if ((m->m_flags & M_EXT) == 0)
+               MH_ALIGN(m, m->m_len);
+
        /*
         * Get pointers on the IP header and the ICMP header.
         */