[src/trunk]: src/sys/kern Revert src/sys/kern/subr_disk_mbr.c r.1.52

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

details:   https://anonhg.NetBSD.org/src/rev/218d7dbf1ac1
branches:  trunk
changeset: 846259:218d7dbf1ac1
user:      kamil <kamil%NetBSD.org@localhost>
date:      Thu Nov 07 18:35:41 2019 +0000

description:
Revert src/sys/kern/subr_disk_mbr.c r.1.52

Addressed in a better way in r. 1.53.

diffstat:

 sys/kern/subr_disk_mbr.c |  11 ++++-------
 1 files changed, 4 insertions(+), 7 deletions(-)

diffs (32 lines):

diff -r 153a20fa4296 -r 218d7dbf1ac1 sys/kern/subr_disk_mbr.c
--- a/sys/kern/subr_disk_mbr.c  Thu Nov 07 18:30:27 2019 +0000
+++ b/sys/kern/subr_disk_mbr.c  Thu Nov 07 18:35:41 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: subr_disk_mbr.c,v 1.53 2019/11/07 18:30:27 kamil Exp $ */
+/*     $NetBSD: subr_disk_mbr.c,v 1.54 2019/11/07 18:35:41 kamil Exp $ */
 
 /*
  * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
@@ -54,7 +54,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: subr_disk_mbr.c,v 1.53 2019/11/07 18:30:27 kamil Exp $");
+__KERNEL_RCSID(0, "$NetBSD: subr_disk_mbr.c,v 1.54 2019/11/07 18:35:41 kamil Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -571,11 +571,8 @@
 static bool
 check_label_magic(const struct disklabel *dlp, uint32_t diskmagic)
 {
-
-       return memcmp((const char *)dlp + offsetof(struct disklabel, d_magic),
-                     &diskmagic, sizeof(diskmagic)) == 0 &&
-           memcmp((const char *)dlp + offsetof(struct disklabel, d_magic2),
-                  &diskmagic, sizeof(diskmagic)) == 0;
+       return memcmp(&dlp->d_magic, &diskmagic, sizeof(diskmagic)) == 0 &&
+           memcmp(&dlp->d_magic2, &diskmagic, sizeof(diskmagic)) == 0;
 }
 
 #ifdef DISKLABEL_EI