[src/trunk]: src/sys/arch/aarch64/aarch64 Improve a comment

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

details:   https://anonhg.NetBSD.org/src/rev/4ca064602afa
branches:  trunk
changeset: 1014732:4ca064602afa
user:      skrll <skrll%NetBSD.org@localhost>
date:      Wed Sep 30 16:47:55 2020 +0000

description:
Improve a comment

diffstat:

 sys/arch/aarch64/aarch64/aarch64_machdep.c |  13 ++++++-------
 1 files changed, 6 insertions(+), 7 deletions(-)

diffs (34 lines):

diff -r 35622d601685 -r 4ca064602afa sys/arch/aarch64/aarch64/aarch64_machdep.c
--- a/sys/arch/aarch64/aarch64/aarch64_machdep.c        Wed Sep 30 16:35:49 2020 +0000
+++ b/sys/arch/aarch64/aarch64/aarch64_machdep.c        Wed Sep 30 16:47:55 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: aarch64_machdep.c,v 1.48 2020/09/16 18:26:15 skrll Exp $ */
+/* $NetBSD: aarch64_machdep.c,v 1.49 2020/09/30 16:47:55 skrll Exp $ */
 
 /*-
  * Copyright (c) 2014 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(1, "$NetBSD: aarch64_machdep.c,v 1.48 2020/09/16 18:26:15 skrll Exp $");
+__KERNEL_RCSID(1, "$NetBSD: aarch64_machdep.c,v 1.49 2020/09/30 16:47:55 skrll Exp $");
 
 #include "opt_arm_debug.h"
 #include "opt_cpuoptions.h"
@@ -251,11 +251,10 @@
 
 #ifdef MODULAR
        /*
-        * aarch64 compiler (gcc & llvm) uses R_AARCH_CALL26/R_AARCH_JUMP26
-        * for function calling/jumping.
-        * (at this time, both compilers doesn't support -mlong-calls)
-        * therefore kernel modules should be loaded within maximum 26bit word,
-        * or +-128MB from kernel.
+        * The aarch64 compilers (gcc & llvm) use R_AARCH_CALL26/R_AARCH_JUMP26
+        * for function calls (bl)/jumps(b). At this time, neither compiler
+        * supports -mlong-calls therefore the kernel modules should be loaded
+        * within the maximum range of +/-128MB from kernel text.
         */
 #define MODULE_RESERVED_MAX    (1024 * 1024 * 128)
 #define MODULE_RESERVED_SIZE   (1024 * 1024 * 32)      /* good enough? */