The branch main has been updated by jhb:
URL:
https://cgit.FreeBSD.org/src/commit/?id=987c5a1944183cf82884fdb96b0432bd810aa8b9
commit 987c5a1944183cf82884fdb96b0432bd810aa8b9
Author: John Baldwin <j...@freebsd.org>
AuthorDate: 2024-11-19 15:22:50 +0000
Commit: John Baldwin <j...@freebsd.org>
CommitDate: 2024-11-19 15:22:50 +0000
arm: Implement atomic_testandset_acq_long as a simple wrapper
Use a memory barrier after calling the existing atomic_testandset_long
rather than using the fcmpset-based fallback version from
<sys/_atomic_subword.h>.
Reviewed by: kib
Sponsored by: AFRL, DARPA
Differential Revision: https://reviews.freebsd.org/D47628
---
sys/arm/include/atomic.h | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/sys/arm/include/atomic.h b/sys/arm/include/atomic.h
index cd6f5cf90d8a..c9232a4f97ef 100644
--- a/sys/arm/include/atomic.h
+++ b/sys/arm/include/atomic.h
@@ -954,6 +954,17 @@ atomic_testandset_long(volatile u_long *p, u_int v)
}
#define atomic_testandset_long atomic_testandset_long
+static __inline int
+atomic_testandset_acq_long(volatile u_long *p, u_int v)
+{
+ int ret;
+
+ ret = atomic_testandset_32((volatile uint32_t *)p, v);
+ dmb();
+ return (ret);
+}
+#define atomic_testandset_acq_long atomic_testandset_acq_long
+
static __inline int
atomic_testandset_64(volatile uint64_t *p, u_int v)
{
@@ -1098,7 +1109,6 @@ atomic_thread_fence_seq_cst(void)
* For:
* - atomic_load_acq_8
* - atomic_load_acq_16
- * - atomic_testandset_acq_long
*/
#include <sys/_atomic_subword.h>
