Index: kern_mutex.c
===================================================================
--- kern_mutex.c	(revision 189789)
+++ kern_mutex.c	(working copy)
@@ -254,8 +254,11 @@
 int
 _mtx_trylock(struct mtx *m, int opts, const char *file, int line)
 {
-	int rval, contested = 0;
+#ifdef LOCK_PROFILING
 	uint64_t waittime = 0;
+	int contested = 0;
+#endif
+	int rval;
 
 	MPASS(curthread != NULL);
 	KASSERT(m->mtx_lock != MTX_DESTROYED,
@@ -296,15 +299,17 @@
     int line)
 {
 	struct turnstile *ts;
+	uintptr_t v;
 #ifdef ADAPTIVE_MUTEXES
 	volatile struct thread *owner;
 #endif
 #ifdef KTR
 	int cont_logged = 0;
 #endif
+#ifdef LOCK_PROFILING
 	int contested = 0;
 	uint64_t waittime = 0;
-	uintptr_t v;
+#endif
 
 	if (mtx_owned(m)) {
 		KASSERT((m->lock_object.lo_flags & LO_RECURSABLE) != 0,
@@ -448,8 +453,11 @@
 _mtx_lock_spin(struct mtx *m, uintptr_t tid, int opts, const char *file,
     int line)
 {
-	int i = 0, contested = 0;
+	int i = 0;
+#ifdef LOCK_PROFILING
+	int contested = 0;
 	uint64_t waittime = 0;
+#endif
 
 	if (LOCK_LOG_TEST(&m->lock_object, opts))
 		CTR1(KTR_LOCK, "_mtx_lock_spin: %p spinning", m);
@@ -486,11 +494,13 @@
 {
 	struct mtx *m;
 	uintptr_t tid;
-	int i, contested;
-	uint64_t waittime;
+	int i;
+#ifdef LOCK_PROFILING
+	int contested = 0;
+	uint64_t waittime = 0;
+#endif
 
-	contested = i = 0;
-	waittime = 0;
+	i = 0;
 	tid = (uintptr_t)curthread;
 	for (;;) {
 retry:
Index: kern_rwlock.c
===================================================================
--- kern_rwlock.c	(revision 189780)
+++ kern_rwlock.c	(working copy)
@@ -282,8 +282,10 @@
 	int spintries = 0;
 	int i;
 #endif
+#ifdef LOCK_PROFILING
 	uint64_t waittime = 0;
 	int contested = 0;
+#endif
 	uintptr_t v;
 
 	KASSERT(rw->rw_lock != RW_DESTROYED,
@@ -584,9 +586,11 @@
 	int spintries = 0;
 	int i;
 #endif
+	uintptr_t v, x;
+#ifdef LOCK_PROFILING
 	uint64_t waittime = 0;
-	uintptr_t v, x;
 	int contested = 0;
+#endif
 
 	if (rw_wlocked(rw)) {
 		KASSERT(rw->lock_object.lo_flags & RW_RECURSE,
Index: kern_sx.c
===================================================================
--- kern_sx.c	(revision 189780)
+++ kern_sx.c	(working copy)
@@ -431,9 +431,12 @@
 #ifdef ADAPTIVE_SX
 	volatile struct thread *owner;
 #endif
+	uintptr_t x;
+#ifdef LOCK_PROFILING
 	uint64_t waittime = 0;
-	uintptr_t x;
-	int contested = 0, error = 0;
+	int contested = 0;
+#endif
+	int error = 0;
 
 	/* If we already hold an exclusive lock, then recurse. */
 	if (sx_xlocked(sx)) {
@@ -652,8 +655,10 @@
 #ifdef ADAPTIVE_SX
 	volatile struct thread *owner;
 #endif
+#ifdef LOCK_PROFILING
 	uint64_t waittime = 0;
 	int contested = 0;
+#endif
 	uintptr_t x;
 	int error = 0;
 
Index: kern_lock.c
===================================================================
--- kern_lock.c	(revision 189788)
+++ kern_lock.c	(working copy)
@@ -333,16 +333,17 @@
     const char *wmesg, int pri, int timo, const char *file, int line)
 {
 	GIANT_DECLARE;
-	uint64_t waittime;
 	struct lock_class *class;
 	const char *iwmesg;
 	uintptr_t tid, v, x;
 	u_int op;
-	int contested, error, ipri, itimo, queue, wakeup_swapper;
+	int error, ipri, itimo, queue, wakeup_swapper;
+#ifdef LOCK_PROFILING
+	uint64_t waittime = 0;
+	int contested = 0;
+#endif
 
-	contested = 0;
 	error = 0;
-	waittime = 0;
 	tid = (uintptr_t)curthread;
 	op = (flags & LK_TYPE_MASK);
 	iwmesg = (wmesg == LK_WMESG_DEFAULT) ? lk->lock_object.lo_name : wmesg;