[src/trunk]: src/sys/arch/arm/arm32 #ifdef _ARM_ARCH_7 the dmbs

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

details:   https://anonhg.NetBSD.org/src/rev/125930d76e5a
branches:  trunk
changeset: 974880:125930d76e5a
user:      skrll <skrll%NetBSD.org@localhost>
date:      Sat Aug 15 13:33:54 2020 +0000

description:
#ifdef _ARM_ARCH_7 the dmbs

diffstat:

 sys/arch/arm/arm32/cpuswitch.S |  9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diffs (39 lines):

diff -r ab3869ff08e8 -r 125930d76e5a sys/arch/arm/arm32/cpuswitch.S
--- a/sys/arch/arm/arm32/cpuswitch.S    Sat Aug 15 13:32:26 2020 +0000
+++ b/sys/arch/arm/arm32/cpuswitch.S    Sat Aug 15 13:33:54 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cpuswitch.S,v 1.102 2020/08/14 16:18:36 skrll Exp $    */
+/*     $NetBSD: cpuswitch.S,v 1.103 2020/08/15 13:33:54 skrll Exp $    */
 
 /*
  * Copyright 2003 Wasabi Systems, Inc.
@@ -87,7 +87,7 @@
 #include <arm/asm.h>
 #include <arm/locore.h>
 
-       RCSID("$NetBSD: cpuswitch.S,v 1.102 2020/08/14 16:18:36 skrll Exp $")
+       RCSID("$NetBSD: cpuswitch.S,v 1.103 2020/08/15 13:33:54 skrll Exp $")
 
 /* LINTSTUB: include <sys/param.h> */
 
@@ -191,7 +191,10 @@
 
        /* We have a new curlwp now so make a note of it */
        str     r6, [r5, #(CI_CURLWP)]
+
+#ifdef _ARM_ARCH_7
        dmb                                     /* see comments in kern_mutex.c */
+#endif
 
        /* Get the new pcb */
        ldr     r7, [r6, #(L_PCB)]
@@ -389,7 +392,9 @@
        mcr     p15, 0, r5, c13, c0, 4  /* save new lwp */
 #endif
        str     r5, [r7, #(CI_CURLWP)]  /* save new lwp */
+#ifdef _ARM_ARCH_7
        dmb                             /* see comments in kern_mutex.c */
+#endif
 
 #ifdef KASAN
        mov     r0, r5