svn commit: r326176 - head/sys/kern

[Mark Johnston]

Author: markj
Date: Fri Nov 24 19:04:31 2017
New Revision: 326176
URL: https://svnweb.freebsd.org/changeset/base/326176

Log:
  Have lockstat:::sx-release fire only after the lock state has changed.
  
  MFC after:	1 week

Modified:
  head/sys/kern/kern_sx.c

Modified: head/sys/kern/kern_sx.c
==============================================================================
--- head/sys/kern/kern_sx.c	Fri Nov 24 19:02:06 2017	(r326175)
+++ head/sys/kern/kern_sx.c	Fri Nov 24 19:04:31 2017	(r326176)
@@ -1180,8 +1180,6 @@ _sx_sunlock_hard(struct sx *sx, uintptr_t x LOCK_FILE_
 	if (SCHEDULER_STOPPED())
 		return;
 
-	LOCKSTAT_PROFILE_RELEASE_RWLOCK(sx__release, sx, LOCKSTAT_READER);
-
 	for (;;) {
 		if (_sx_sunlock_try(sx, &x))
 			break;
@@ -1217,6 +1215,7 @@ _sx_sunlock_hard(struct sx *sx, uintptr_t x LOCK_FILE_
 			kick_proc0();
 		break;
 	}
+	LOCKSTAT_PROFILE_RELEASE_RWLOCK(sx__release, sx, LOCKSTAT_READER);
 }
 
 void