svn commit: r320403 - head/sys/arm64/include

[Andrew Turner]

Author: andrew
Date: Tue Jun 27 10:45:13 2017
New Revision: 320403
URL: https://svnweb.freebsd.org/changeset/base/320403

Log:
  Some of the atomic_clear_* functions were incorrectly defined to be an
  atomic add. Correct these, fixing a NULL-pointer dereference in netgraph.
  
  PR:		220273
  MFC after:	3 days
  Sponsored by:	DARPA, AFRL

Modified:
  head/sys/arm64/include/atomic.h

Modified: head/sys/arm64/include/atomic.h
==============================================================================
--- head/sys/arm64/include/atomic.h	Tue Jun 27 10:09:00 2017	(r320402)
+++ head/sys/arm64/include/atomic.h	Tue Jun 27 10:45:13 2017	(r320403)
@@ -385,7 +385,7 @@ atomic_store_rel_64(volatile uint64_t *p, uint64_t val
 
 #define	atomic_add_rel_int		atomic_add_rel_32
 #define	atomic_fcmpset_rel_int		atomic_fcmpset_rel_32
-#define	atomic_clear_rel_int		atomic_add_rel_32
+#define	atomic_clear_rel_int		atomic_clear_rel_32
 #define	atomic_cmpset_rel_int		atomic_cmpset_rel_32
 #define	atomic_set_rel_int		atomic_set_rel_32
 #define	atomic_subtract_rel_int		atomic_subtract_rel_32
@@ -413,7 +413,7 @@ atomic_store_rel_64(volatile uint64_t *p, uint64_t val
 
 #define	atomic_add_acq_long		atomic_add_acq_64
 #define	atomic_fcmpset_acq_long		atomic_fcmpset_acq_64
-#define	atomic_clear_acq_long		atomic_add_acq_64
+#define	atomic_clear_acq_long		atomic_clear_acq_64
 #define	atomic_cmpset_acq_long		atomic_cmpset_acq_64
 #define	atomic_load_acq_long		atomic_load_acq_64
 #define	atomic_set_acq_long		atomic_set_acq_64
@@ -421,7 +421,7 @@ atomic_store_rel_64(volatile uint64_t *p, uint64_t val
 
 #define	atomic_add_acq_ptr		atomic_add_acq_64
 #define	atomic_fcmpset_acq_ptr		atomic_fcmpset_acq_64
-#define	atomic_clear_acq_ptr		atomic_add_acq_64
+#define	atomic_clear_acq_ptr		atomic_clear_acq_64
 #define	atomic_cmpset_acq_ptr		atomic_cmpset_acq_64
 #define	atomic_load_acq_ptr		atomic_load_acq_64
 #define	atomic_set_acq_ptr		atomic_set_acq_64
@@ -448,6 +448,7 @@ atomic_thread_fence_acq(void)
 {
 
 	dmb(ld);
+
 }
 
 static __inline void