Index: sys/vm/vm_page.h
===================================================================
--- sys/vm/vm_page.h
+++ sys/vm/vm_page.h
@@ -731,24 +731,12 @@
 #define	vm_page_busied(m)						\
 	((m)->busy_lock != VPB_UNBUSIED)
 
-#define	vm_page_sbusy(m) do {						\
-	if (!vm_page_trysbusy(m))					\
-		panic("%s: page %p failed shared busying", __func__,	\
-		    (m));						\
-} while (0)
-
 #define	vm_page_xbusied(m)						\
 	(((m)->busy_lock & VPB_SINGLE_EXCLUSIVE) != 0)
 
 #define	vm_page_busy_freed(m)						\
 	((m)->busy_lock == VPB_FREED)
 
-#define	vm_page_xbusy(m) do {						\
-	if (!vm_page_tryxbusy(m))					\
-		panic("%s: page %p failed exclusive busying", __func__,	\
-		    (m));						\
-} while (0)
-
 /* Note: page m's lock must not be owned by the caller. */
 #define	vm_page_xunbusy(m) do {						\
 	if (!atomic_cmpset_rel_int(&(m)->busy_lock,			\