diff options
| author | John Baldwin <jhb@FreeBSD.org> | 2024-11-19 15:22:50 +0000 |
|---|---|---|
| committer | John Baldwin <jhb@FreeBSD.org> | 2024-11-19 15:22:50 +0000 |
| commit | 987c5a1944183cf82884fdb96b0432bd810aa8b9 (patch) | |
| tree | 0f110f58373514d9f8e1eeb8d368dd5d141df51c | |
| parent | a474e53d03ca8c78696fc222520de7d6876cc530 (diff) | |
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
| -rw-r--r-- | sys/arm/include/atomic.h | 12 |
1 files changed, 11 insertions, 1 deletions
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 @@ -955,6 +955,17 @@ 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) { volatile uint32_t *p32; @@ -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> |