diff --git a/sys/amd64/amd64/trap.c b/sys/amd64/amd64/trap.c
index 9f3ac4f8c8bd..ce0ab6a51ca6 100644
--- a/sys/amd64/amd64/trap.c
+++ b/sys/amd64/amd64/trap.c
@@ -95,28 +95,6 @@ PMC_SOFT_DEFINE( , , page_fault, write);
 
 #ifdef KDTRACE_HOOKS
 #include <sys/dtrace_bsd.h>
-
-/*
- * This is a hook which is initialised by the dtrace module
- * to handle traps which might occur during DTrace probe
- * execution.
- */
-dtrace_trap_func_t	dtrace_trap_func;
-
-dtrace_doubletrap_func_t	dtrace_doubletrap_func;
-
-/*
- * This is a hook which is initialised by the systrace module
- * when it is loaded. This keeps the DTrace syscall provider
- * implementation opaque. 
- */
-systrace_probe_func_t	systrace_probe_func;
-
-/*
- * These hooks are necessary for the pid and usdt providers.
- */
-dtrace_pid_probe_ptr_t		dtrace_pid_probe_ptr;
-dtrace_return_probe_ptr_t	dtrace_return_probe_ptr;
 #endif
 
 extern void trap(struct trapframe *frame);
diff --git a/sys/i386/i386/trap.c b/sys/i386/i386/trap.c
index be76575a816f..97254f25bde4 100644
--- a/sys/i386/i386/trap.c
+++ b/sys/i386/i386/trap.c
@@ -104,28 +104,6 @@ PMC_SOFT_DEFINE( , , page_fault, write);
 
 #ifdef KDTRACE_HOOKS
 #include <sys/dtrace_bsd.h>
-
-/*
- * This is a hook which is initialised by the dtrace module
- * to handle traps which might occur during DTrace probe
- * execution.
- */
-dtrace_trap_func_t	dtrace_trap_func;
-
-dtrace_doubletrap_func_t	dtrace_doubletrap_func;
-
-/*
- * This is a hook which is initialised by the systrace module
- * when it is loaded. This keeps the DTrace syscall provider
- * implementation opaque. 
- */
-systrace_probe_func_t	systrace_probe_func;
-
-/*
- * These hooks are necessary for the pid and usdt providers.
- */
-dtrace_pid_probe_ptr_t		dtrace_pid_probe_ptr;
-dtrace_return_probe_ptr_t	dtrace_return_probe_ptr;
 #endif
 
 extern void trap(struct trapframe *frame);
diff --git a/sys/kern/kern_dtrace.c b/sys/kern/kern_dtrace.c
index 5582fb967836..f5f14b7fc296 100644
--- a/sys/kern/kern_dtrace.c
+++ b/sys/kern/kern_dtrace.c
@@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/proc.h>
 #include <sys/dtrace_bsd.h>
 #include <sys/sysctl.h>
+#include <sys/sysent.h>
 
 #define KDTRACE_PROC_SIZE	64
 #define	KDTRACE_THREAD_SIZE	256
@@ -47,6 +48,14 @@ FEATURE(kdtrace_hooks,
 
 static MALLOC_DEFINE(M_KDTRACE, "kdtrace", "DTrace hooks");
 
+/* Hooks used in the machine-dependent trap handlers. */
+dtrace_trap_func_t		dtrace_trap_func;
+dtrace_doubletrap_func_t	dtrace_doubletrap_func;
+dtrace_pid_probe_ptr_t		dtrace_pid_probe_ptr;
+dtrace_return_probe_ptr_t	dtrace_return_probe_ptr;
+
+systrace_probe_func_t		systrace_probe_func;
+
 /* Return the DTrace process data size compiled in the kernel hooks. */
 size_t
 kdtrace_proc_size()
diff --git a/sys/mips/mips/trap.c b/sys/mips/mips/trap.c
index 80955307bcc7..f0df09c8629e 100644
--- a/sys/mips/mips/trap.c
+++ b/sys/mips/mips/trap.c
@@ -93,28 +93,6 @@ __FBSDID("$FreeBSD$");
 
 #ifdef KDTRACE_HOOKS
 #include <sys/dtrace_bsd.h>
-
-/*
- * This is a hook which is initialised by the dtrace module
- * to handle traps which might occur during DTrace probe
- * execution.
- */
-dtrace_trap_func_t	dtrace_trap_func;
-
-dtrace_doubletrap_func_t	dtrace_doubletrap_func;
-
-/*
- * This is a hook which is initialised by the systrace module
- * when it is loaded. This keeps the DTrace syscall provider
- * implementation opaque. 
- */
-systrace_probe_func_t	systrace_probe_func;
-
-/*
- * These hooks are necessary for the pid and usdt providers.
- */
-dtrace_pid_probe_ptr_t		dtrace_pid_probe_ptr;
-dtrace_return_probe_ptr_t	dtrace_return_probe_ptr;
 #endif
 
 #ifdef TRAP_DEBUG
diff --git a/sys/powerpc/aim/trap.c b/sys/powerpc/aim/trap.c
index 33e8cf5dac43..a3380e3bf387 100644
--- a/sys/powerpc/aim/trap.c
+++ b/sys/powerpc/aim/trap.c
@@ -95,27 +95,6 @@ struct powerpc_exception {
 #ifdef KDTRACE_HOOKS
 #include <sys/dtrace_bsd.h>
 
-/*
- * This is a hook which is initialised by the dtrace module
- * to handle traps which might occur during DTrace probe
- * execution.
- */
-dtrace_trap_func_t	dtrace_trap_func;
-
-dtrace_doubletrap_func_t	dtrace_doubletrap_func;
-
-/*
- * This is a hook which is initialised by the systrace module
- * when it is loaded. This keeps the DTrace syscall provider
- * implementation opaque. 
- */
-systrace_probe_func_t	systrace_probe_func;
-
-/*
- * These hooks are necessary for the pid and usdt providers.
- */
-dtrace_pid_probe_ptr_t		dtrace_pid_probe_ptr;
-dtrace_return_probe_ptr_t	dtrace_return_probe_ptr;
 int (*dtrace_invop_jump_addr)(struct trapframe *);
 #endif