[src/trunk]: src/sys/arch/amd64/amd64 Hide the computation in a macro.

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

details:   https://anonhg.NetBSD.org/src/rev/20faefe43a0a
branches:  trunk
changeset: 825163:20faefe43a0a
user:      maxv <maxv%NetBSD.org@localhost>
date:      Sun Jul 02 09:02:51 2017 +0000

description:
Hide the computation in a macro.

diffstat:

 sys/arch/amd64/amd64/gdt.c |  16 ++++++++--------
 1 files changed, 8 insertions(+), 8 deletions(-)

diffs (51 lines):

diff -r 5143a79bd217 -r 20faefe43a0a sys/arch/amd64/amd64/gdt.c
--- a/sys/arch/amd64/amd64/gdt.c        Sun Jul 02 09:02:06 2017 +0000
+++ b/sys/arch/amd64/amd64/gdt.c        Sun Jul 02 09:02:51 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: gdt.c,v 1.38 2017/03/25 15:05:16 maxv Exp $    */
+/*     $NetBSD: gdt.c,v 1.39 2017/07/02 09:02:51 maxv Exp $    */
 
 /*-
  * Copyright (c) 1996, 1997, 2009 The NetBSD Foundation, Inc.
@@ -37,7 +37,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: gdt.c,v 1.38 2017/03/25 15:05:16 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: gdt.c,v 1.39 2017/07/02 09:02:51 maxv Exp $");
 
 #include "opt_multiprocessor.h"
 #include "opt_xen.h"
@@ -57,8 +57,10 @@
 #include <xen/hypervisor.h>
 #endif
 
-#define NDYNSLOTS \
-       ((MAXGDTSIZ - DYNSEL_START) / sizeof(struct sys_segment_descriptor))
+#define NSLOTS(sz)     \
+       ((sz - DYNSEL_START) / sizeof(struct sys_segment_descriptor))
+
+#define NDYNSLOTS      NSLOTS(MAXGDTSIZ)
 
 typedef struct {
        bool busy[NDYNSLOTS];
@@ -131,8 +133,7 @@
        /* Initialize the global values */
        gdt_size = MINGDTSIZ;
        memset(&gdt_bitmap.busy, 0, sizeof(gdt_bitmap.busy));
-       gdt_bitmap.nslots =
-           (gdt_size - DYNSEL_START) / sizeof(struct sys_segment_descriptor);
+       gdt_bitmap.nslots = NSLOTS(gdt_size);
 
        old_gdt = gdtstore;
 
@@ -234,8 +235,7 @@
        gdt_size *= 2;
        if (gdt_size > MAXGDTSIZ)
                gdt_size = MAXGDTSIZ;
-       gdt_bitmap.nslots =
-           (gdt_size - DYNSEL_START) / sizeof(struct sys_segment_descriptor);
+       gdt_bitmap.nslots = NSLOTS(gdt_size);
 
        for (CPU_INFO_FOREACH(cii, ci)) {
                for (va = (vaddr_t)(ci->ci_gdt) + old_size;