[src/trunk]: src/sys/external/bsd/drm2/include/linux atomic_long_xchg

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

details:   https://anonhg.NetBSD.org/src/rev/f55668987538
branches:  trunk
changeset: 1028397:f55668987538
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Sun Dec 19 10:57:12 2021 +0000

description:
atomic_long_xchg

diffstat:

 sys/external/bsd/drm2/include/linux/atomic.h |  14 +++++++++++++-
 1 files changed, 13 insertions(+), 1 deletions(-)

diffs (28 lines):

diff -r 29c6cfc5d196 -r f55668987538 sys/external/bsd/drm2/include/linux/atomic.h
--- a/sys/external/bsd/drm2/include/linux/atomic.h      Sun Dec 19 10:57:05 2021 +0000
+++ b/sys/external/bsd/drm2/include/linux/atomic.h      Sun Dec 19 10:57:12 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: atomic.h,v 1.29 2021/12/19 01:46:01 riastradh Exp $    */
+/*     $NetBSD: atomic.h,v 1.30 2021/12/19 10:57:12 riastradh Exp $    */
 
 /*-
  * Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -421,6 +421,18 @@
 }
 
 static inline long
+atomic_long_xchg(struct atomic_long *a, long new)
+{
+       long old;
+
+       smp_mb__before_atomic();
+       old = (long)atomic_swap_ulong(&a->al_v, (unsigned long)new);
+       smp_mb__after_atomic();
+
+       return old;
+}
+
+static inline long
 atomic_long_cmpxchg(struct atomic_long *a, long expect, long new)
 {
        long old;