Module Name: src
Committed By: riastradh
Date: Sun Dec 19 01:39:20 UTC 2021
Modified Files:
src/sys/external/bsd/drm2/include/linux: atomic.h
Log Message:
atomic_fetch_xor
To generate a diff of this commit:
cvs rdiff -u -r1.24 -r1.25 src/sys/external/bsd/drm2/include/linux/atomic.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/external/bsd/drm2/include/linux/atomic.h
diff -u src/sys/external/bsd/drm2/include/linux/atomic.h:1.24 src/sys/external/bsd/drm2/include/linux/atomic.h:1.25
--- src/sys/external/bsd/drm2/include/linux/atomic.h:1.24 Sun Dec 19 01:33:51 2021
+++ src/sys/external/bsd/drm2/include/linux/atomic.h Sun Dec 19 01:39:20 2021
@@ -1,4 +1,4 @@
-/* $NetBSD: atomic.h,v 1.24 2021/12/19 01:33:51 riastradh Exp $ */
+/* $NetBSD: atomic.h,v 1.25 2021/12/19 01:39:20 riastradh Exp $ */
/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
@@ -169,6 +169,22 @@ atomic_andnot(int value, atomic_t *atomi
atomic_and_uint(&atomic->a_u.au_uint, ~value);
}
+static inline int
+atomic_fetch_xor(int value, atomic_t *atomic)
+{
+ unsigned old, new;
+
+ smp_mb__before_atomic();
+ do {
+ old = atomic->a_u.au_uint;
+ __insn_barrier();
+ new = old ^ value;
+ } while (atomic_cas_uint(&atomic->a_u.au_uint, old, new) != old);
+ smp_mb__after_atomic();
+
+ return old;
+}
+
static inline void
atomic_set_mask(unsigned long mask, atomic_t *atomic)
{
