details: https://anonhg.NetBSD.org/src/rev/c9ca373036ba
branches: trunk
changeset: 1028016:c9ca373036ba
user: riastradh <riastradh%NetBSD.org@localhost>
date: Sun Dec 19 01:39:27 2021 +0000
description:
Guarantee no repeated loads.
diffstat:
sys/external/bsd/drm2/include/linux/atomic.h | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diffs (25 lines):
diff -r a6fe649a94ac -r c9ca373036ba sys/external/bsd/drm2/include/linux/atomic.h
--- a/sys/external/bsd/drm2/include/linux/atomic.h Sun Dec 19 01:39:20 2021 +0000
+++ b/sys/external/bsd/drm2/include/linux/atomic.h Sun Dec 19 01:39:27 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: atomic.h,v 1.25 2021/12/19 01:39:20 riastradh Exp $ */
+/* $NetBSD: atomic.h,v 1.26 2021/12/19 01:39:27 riastradh Exp $ */
/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -207,6 +207,7 @@
smp_mb__before_atomic();
do {
value = atomic->a_u.au_int;
+ __insn_barrier();
if (value == zero)
break;
} while (atomic_cas_uint(&atomic->a_u.au_uint, value, (value + addend))
@@ -389,6 +390,7 @@
smp_mb__before_atomic();
do {
value = (long)a->al_v;
+ __insn_barrier();
if (value == zero)
break;
} while (atomic_cas_ulong(&a->al_v, (unsigned long)value,