git: ec7b80ade997 - stable/12 - powerpc/atomic: Fix atomic_cmpset_rel()
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Date: Thu, 07 Oct 2021 03:28:12 UTC
The branch stable/12 has been updated by kevans:
URL: https://cgit.FreeBSD.org/src/commit/?id=ec7b80ade997c5011bc1f1ccd5a74384b70239f2
commit ec7b80ade997c5011bc1f1ccd5a74384b70239f2
Author: Justin Hibbits <jhibbits@FreeBSD.org>
AuthorDate: 2019-10-15 03:37:21 +0000
Commit: Kyle Evans <kevans@FreeBSD.org>
CommitDate: 2021-10-07 03:27:26 +0000
powerpc/atomic: Fix atomic_cmpset_rel()
Need a release barrier, not an acquire barrier, else bad things happen.
(cherry picked from commit 9551397f51a7041dd0060bae1433d0e802373e35)
---
sys/powerpc/include/atomic.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sys/powerpc/include/atomic.h b/sys/powerpc/include/atomic.h
index c72639811e39..788e7520d7bc 100644
--- a/sys/powerpc/include/atomic.h
+++ b/sys/powerpc/include/atomic.h
@@ -686,7 +686,7 @@ atomic_cmpset_long(volatile u_long* p, u_long cmpval, u_long newval)
atomic_cmpset_rel_##type(volatile u_##type *p, \
u_##type cmpval, u_##type newval)\
{\
- __ATOMIC_ACQ();\
+ __ATOMIC_REL();\
return (atomic_cmpset_##type(p, cmpval, newval));\
}\
struct hack