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From: Justin Hibbits <jhibbits@FreeBSD.org>
Date: Tue, 15 Oct 2019 03:37:21 +0000 (UTC)
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Subject: svn commit: r353536 - head/sys/powerpc/include
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Author: jhibbits
Date: Tue Oct 15 03:37:21 2019
New Revision: 353536
URL: https://svnweb.freebsd.org/changeset/base/353536

Log:
  powerpc/atomic: Fix atomic_cmpset_rel()
  
  Need a release barrier, not an acquire barrier, else bad things happen.

Modified:
  head/sys/powerpc/include/atomic.h

Modified: head/sys/powerpc/include/atomic.h
==============================================================================
--- head/sys/powerpc/include/atomic.h	Tue Oct 15 03:35:11 2019	(r353535)
+++ head/sys/powerpc/include/atomic.h	Tue Oct 15 03:37:21 2019	(r353536)
@@ -682,7 +682,7 @@ atomic_cmpset_long(volatile u_long* p, u_long cmpval, 
     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