[src/trunk]: src/sys/arch/vax/vsa Don't let compiler optimize out the framebu...

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

details:   https://anonhg.NetBSD.org/src/rev/01affca14256
branches:  trunk
changeset: 372585:01affca14256
user:      jakllsch <jakllsch%NetBSD.org@localhost>
date:      Sat Dec 10 19:50:43 2022 +0000

description:
Don't let compiler optimize out the framebuffer probe in lcg_match() by
using keyword volatile.

diffstat:

 sys/arch/vax/vsa/lcg.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r 1703a7315e9b -r 01affca14256 sys/arch/vax/vsa/lcg.c
--- a/sys/arch/vax/vsa/lcg.c    Sat Dec 10 18:49:44 2022 +0000
+++ b/sys/arch/vax/vsa/lcg.c    Sat Dec 10 19:50:43 2022 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: lcg.c,v 1.10 2022/07/06 12:33:41 andvar Exp $ */
+/*     $NetBSD: lcg.c,v 1.11 2022/12/10 19:50:43 jakllsch Exp $ */
 /*
  * LCG accelerated framebuffer driver
  * Copyright (c) 2003, 2004 Blaz Antonic
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: lcg.c,v 1.10 2022/07/06 12:33:41 andvar Exp $");
+__KERNEL_RCSID(0, "$NetBSD: lcg.c,v 1.11 2022/12/10 19:50:43 jakllsch Exp $");
 
 #define LCG_NO_ACCEL
 
@@ -433,7 +433,7 @@
 {
        struct vsbus_softc *sc = device_private(parent);
        struct vsbus_attach_args *va = aux;
-       char *ch = (char *)va->va_addr;
+       volatile char * const ch = (char *)va->va_addr;
 
        if ((vax_boardtype != VAX_BTYP_46) && (vax_boardtype != VAX_BTYP_48))
                return 0;