git: 994b7127f670 - stable/14 - arm: Implement atomic_testandset_acq_long as a simple wrapper

The branch stable/14 has been updated by jhb:

URL: https://cgit.FreeBSD.org/src/commit/?id=994b7127f670db8ab0799e5954ea2f40042c1c3a

commit 994b7127f670db8ab0799e5954ea2f40042c1c3a
Author:     John Baldwin <jhb@FreeBSD.org>
AuthorDate: 2024-11-19 15:22:50 +0000
Commit:     John Baldwin <jhb@FreeBSD.org>
CommitDate: 2024-12-01 02:46:07 +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
    
    (cherry picked from commit 987c5a1944183cf82884fdb96b0432bd810aa8b9)
---
 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 2cf97017b04a..dd2ad47e9bed 100644
--- a/sys/arm/include/atomic.h
+++ b/sys/arm/include/atomic.h
@@ -960,6 +960,17 @@ 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)
 {
@@ -1097,7 +1108,6 @@ atomic_thread_fence_seq_cst(void)
  * For:
  *  - atomic_load_acq_8
  *  - atomic_load_acq_16
- *  - atomic_testandset_acq_long
  */
 #include <sys/_atomic_subword.h>