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

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

details:   https://anonhg.NetBSD.org/src/rev/504c57bd9910
branches:  trunk
changeset: 1028447:504c57bd9910
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Sun Dec 19 11:04:28 2021 +0000

description:
cmpxchg

diffstat:

 sys/external/bsd/drm2/include/linux/atomic.h |  7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diffs (21 lines):

diff -r 4fa9136064df -r 504c57bd9910 sys/external/bsd/drm2/include/linux/atomic.h
--- a/sys/external/bsd/drm2/include/linux/atomic.h      Sun Dec 19 11:04:21 2021 +0000
+++ b/sys/external/bsd/drm2/include/linux/atomic.h      Sun Dec 19 11:04:28 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: atomic.h,v 1.34 2021/12/19 11:03:01 riastradh Exp $    */
+/*     $NetBSD: atomic.h,v 1.35 2021/12/19 11:04:28 riastradh Exp $    */
 
 /*-
  * Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -43,6 +43,11 @@
            : sizeof(*(P)) == 8 ? atomic_swap_64((volatile uint64_t *)P, V)   \
            : (__builtin_abort(), 0))
 
+#define        cmpxchg(P, O, N)                                                      \
+       (sizeof(*(P)) == 4 ? atomic_cas_32((volatile uint32_t *)P, O, N)      \
+           : sizeof(*(P)) == 8 ? atomic_cas_64((volatile uint64_t *)P, O, N) \
+           : (__builtin_abort(), 0))
+
 /*
  * atomic (u)int operations
  *