diff --git a/sbin/kldunload/kldunload.8 b/sbin/kldunload/kldunload.8
index f74965613500..935e5afb71ed 100644
--- a/sbin/kldunload/kldunload.8
+++ b/sbin/kldunload/kldunload.8
@@ -33,9 +33,11 @@
 .Nd unload a file from the kernel
 .Sh SYNOPSIS
 .Nm
+.Op Fl f
 .Op Fl v
 .Fl i Ar id
 .Nm
+.Op Fl f
 .Op Fl v
 .Op Fl n
 .Ar name
@@ -47,6 +49,11 @@ utility unloads a file which was previously loaded with
 .Pp
 The following options are available:
 .Bl -tag -width indentXX
+.It Fl f
+Force the unload.
+This ignores error returns to MOD_QUISCE from the module and implies
+that the module should be unloaded even if it is currently in use.
+The users are left to cope as best they can.
 .It Fl v
 Be more verbose.
 .It Fl i Ar id
diff --git a/sbin/kldunload/kldunload.c b/sbin/kldunload/kldunload.c
index be86960b3e17..29da28d07774 100644
--- a/sbin/kldunload/kldunload.c
+++ b/sbin/kldunload/kldunload.c
@@ -48,10 +48,14 @@ main(int argc, char** argv)
     int c;
     int verbose = 0;
     int fileid = 0;
+    int force = LINKER_UNLOAD_NORMAL;
     char* filename = NULL;
 
-    while ((c = getopt(argc, argv, "i:n:v")) != -1)
+    while ((c = getopt(argc, argv, "fi:n:v")) != -1)
 	switch (c) {
+	case 'f':
+	    force = LINKER_UNLOAD_FORCE;
+	    break;
 	case 'i':
 	    fileid = atoi(optarg);
 	    if (!fileid)
@@ -93,7 +97,7 @@ main(int argc, char** argv)
 	printf("Unloading %s, id=%d\n", stat.name, fileid);
     }
 
-    if (kldunload(fileid) < 0)
+    if (kldunloadf(fileid, force) < 0)
 	err(1, "can't unload file");
 
     return 0;
diff --git a/share/man/man9/module.9 b/share/man/man9/module.9
index 6dc14b266888..39b95a40fd81 100644
--- a/share/man/man9/module.9
+++ b/share/man/man9/module.9
@@ -47,19 +47,37 @@ The
 .Xr DECLARE_MODULE 9
 macro
 registers the module with the system.
+.Pp
 When the module is loaded, the event handler function is called with
 the
 .Fa what
 argument set to
 .Dv MOD_LOAD .
-On unload,
+.Pp
+On unload it is first called with
+.Fa what
+set to MOD_QUIESCE .
+If the unload was not forced, a non-zero return will prevent the
+unload from happening.
+.Pp
+If the unload continues
 .Fa what
 is set to
 .Dv MOD_UNLOAD .
+If the module returns non-zero to this, the unload will not happen.
+.Pp
+The difference between MOD_QUIESCE and MOD_UNLOAD is that the module
+should fail MOD_QUIESCE if it is currently in use, whereas MOD_UNLOAD
+should only fail if it is impossible to unload the module, for instance
+because there are memory references to the module which cannot be revoked.
+.Pp
 When the system is shutting down,
 .Fa what
 contains the value of
 .Dv MOD_SHUTDOWN .
+.Pp
+The module should return EOPNOTSUPP for unrecognized values of
+.Fa what .
 .Sh EXAMPLES
 .Bd -literal
 #include <sys/param.h>
diff --git a/sys/compat/freebsd32/freebsd32_proto.h b/sys/compat/freebsd32/freebsd32_proto.h
index 79fc978316aa..acebc695863b 100644
--- a/sys/compat/freebsd32/freebsd32_proto.h
+++ b/sys/compat/freebsd32/freebsd32_proto.h
@@ -3,7 +3,7 @@
  *
  * DO NOT EDIT-- this file is automatically generated.
  * $FreeBSD$
- * created from FreeBSD: src/sys/compat/freebsd32/syscalls.master,v 1.38 2004/07/02 00:35:52 marcel Exp 
+ * created from FreeBSD: src/sys/compat/freebsd32/syscalls.master,v 1.39 2004/07/13 19:35:11 phk Exp 
  */
 
 #ifndef _FREEBSD32_SYSPROTO_H_
@@ -205,6 +205,10 @@ struct freebsd32_sigaction_args {
 struct freebsd32_sigreturn_args {
 	char sigcntxp_l_[PADL_(const struct freebsd32_ucontext *)]; const struct freebsd32_ucontext * sigcntxp; char sigcntxp_r_[PADR_(const struct freebsd32_ucontext *)];
 };
+struct kldunloadf_args {
+	char fileid_l_[PADL_(int)]; int fileid; char fileid_r_[PADR_(int)];
+	char flags_l_[PADL_(int)]; int flags; char flags_r_[PADR_(int)];
+};
 int	freebsd32_wait4(struct thread *, struct freebsd32_wait4_args *);
 int	freebsd32_sigaltstack(struct thread *, struct freebsd32_sigaltstack_args *);
 int	freebsd32_execve(struct thread *, struct freebsd32_execve_args *);
@@ -235,6 +239,7 @@ int	freebsd32_kevent(struct thread *, struct freebsd32_kevent_args *);
 int	freebsd32_sendfile(struct thread *, struct freebsd32_sendfile_args *);
 int	freebsd32_sigaction(struct thread *, struct freebsd32_sigaction_args *);
 int	freebsd32_sigreturn(struct thread *, struct freebsd32_sigreturn_args *);
+int	kldunloadf(struct thread *, struct kldunloadf_args *);
 
 #ifdef COMPAT_43
 
diff --git a/sys/compat/freebsd32/freebsd32_syscall.h b/sys/compat/freebsd32/freebsd32_syscall.h
index 524e7832c377..72fe352087d9 100644
--- a/sys/compat/freebsd32/freebsd32_syscall.h
+++ b/sys/compat/freebsd32/freebsd32_syscall.h
@@ -3,7 +3,7 @@
  *
  * DO NOT EDIT-- this file is automatically generated.
  * $FreeBSD$
- * created from FreeBSD: src/sys/compat/freebsd32/syscalls.master,v 1.38 2004/07/02 00:35:52 marcel Exp 
+ * created from FreeBSD: src/sys/compat/freebsd32/syscalls.master,v 1.39 2004/07/13 19:35:11 phk Exp 
  */
 
 #define	FREEBSD32_SYS_syscall	0
@@ -301,4 +301,5 @@
 #define	FREEBSD32_SYS_jail_attach	436
 #define	FREEBSD32_SYS_thr_suspend	442
 #define	FREEBSD32_SYS_thr_wake	443
-#define	FREEBSD32_SYS_MAXSYSCALL	444
+#define	FREEBSD32_SYS_kldunloadf	444
+#define	FREEBSD32_SYS_MAXSYSCALL	445
diff --git a/sys/compat/freebsd32/freebsd32_syscalls.c b/sys/compat/freebsd32/freebsd32_syscalls.c
index 6d73c55e1960..291f8c4d922f 100644
--- a/sys/compat/freebsd32/freebsd32_syscalls.c
+++ b/sys/compat/freebsd32/freebsd32_syscalls.c
@@ -3,7 +3,7 @@
  *
  * DO NOT EDIT-- this file is automatically generated.
  * $FreeBSD$
- * created from FreeBSD: src/sys/compat/freebsd32/syscalls.master,v 1.38 2004/07/02 00:35:52 marcel Exp 
+ * created from FreeBSD: src/sys/compat/freebsd32/syscalls.master,v 1.39 2004/07/13 19:35:11 phk Exp 
  */
 
 const char *freebsd32_syscallnames[] = {
@@ -451,4 +451,5 @@ const char *freebsd32_syscallnames[] = {
 	"#441",			/* 441 = ksem_timedwait */
 	"thr_suspend",			/* 442 = thr_suspend */
 	"thr_wake",			/* 443 = thr_wake */
+	"kldunloadf",			/* 444 = kldunloadf */
 };
diff --git a/sys/compat/freebsd32/freebsd32_sysent.c b/sys/compat/freebsd32/freebsd32_sysent.c
index dc4fd105a062..26144c6df1d6 100644
--- a/sys/compat/freebsd32/freebsd32_sysent.c
+++ b/sys/compat/freebsd32/freebsd32_sysent.c
@@ -3,7 +3,7 @@
  *
  * DO NOT EDIT-- this file is automatically generated.
  * $FreeBSD$
- * created from FreeBSD: src/sys/compat/freebsd32/syscalls.master,v 1.38 2004/07/02 00:35:52 marcel Exp 
+ * created from FreeBSD: src/sys/compat/freebsd32/syscalls.master,v 1.39 2004/07/13 19:35:11 phk Exp 
  */
 
 #include "opt_compat.h"
@@ -469,4 +469,5 @@ struct sysent freebsd32_sysent[] = {
 	{ 0, (sy_call_t *)nosys },			/* 441 = ksem_timedwait */
 	{ SYF_MPSAFE | AS(thr_suspend_args), (sy_call_t *)thr_suspend },	/* 442 = thr_suspend */
 	{ SYF_MPSAFE | AS(thr_wake_args), (sy_call_t *)thr_wake },	/* 443 = thr_wake */
+	{ SYF_MPSAFE | AS(kldunloadf_args), (sy_call_t *)kldunloadf },	/* 444 = kldunloadf */
 };
diff --git a/sys/dev/digi/digi.c b/sys/dev/digi/digi.c
index 68081d5f346c..b08cd5892f0b 100644
--- a/sys/dev/digi/digi.c
+++ b/sys/dev/digi/digi.c
@@ -1042,7 +1042,7 @@ digi_loadmoduledata(struct digi_softc *sc)
 	if (digi_mod->dm_version != DIGI_MOD_VERSION) {
 		printf("digi_%s.ko: Invalid version %d (need %d)\n",
 		    sc->module, digi_mod->dm_version, DIGI_MOD_VERSION);
-		linker_file_unload(lf);
+		linker_file_unload(lf, LINKER_UNLOAD_FORCE);
 		return (EINVAL);
 	}
 
@@ -1064,7 +1064,7 @@ digi_loadmoduledata(struct digi_softc *sc)
 		bcopy(digi_mod->dm_link.data, sc->link.data, sc->link.size);
 	}
 
-	linker_file_unload(lf);
+	linker_file_unload(lf, LINKER_UNLOAD_FORCE);
 
 	return (0);
 }
diff --git a/sys/kern/init_sysent.c b/sys/kern/init_sysent.c
index 9d0ecade6a44..1185cf817f81 100644
--- a/sys/kern/init_sysent.c
+++ b/sys/kern/init_sysent.c
@@ -3,7 +3,7 @@
  *
  * DO NOT EDIT-- this file is automatically generated.
  * $FreeBSD$
- * created from FreeBSD: src/sys/kern/syscalls.master,v 1.174 2004/07/02 00:35:52 marcel Exp 
+ * created from FreeBSD: src/sys/kern/syscalls.master,v 1.176 2004/07/13 19:35:10 phk Exp 
  */
 
 #include "opt_compat.h"
@@ -472,4 +472,5 @@ struct sysent sysent[] = {
 	{ SYF_MPSAFE | AS(ksem_timedwait_args), (sy_call_t *)lkmressys },	/* 441 = ksem_timedwait */
 	{ SYF_MPSAFE | AS(thr_suspend_args), (sy_call_t *)thr_suspend },	/* 442 = thr_suspend */
 	{ SYF_MPSAFE | AS(thr_wake_args), (sy_call_t *)thr_wake },	/* 443 = thr_wake */
+	{ SYF_MPSAFE | AS(kldunloadf_args), (sy_call_t *)kldunloadf },	/* 444 = kldunloadf */
 };
diff --git a/sys/kern/kern_linker.c b/sys/kern/kern_linker.c
index 4ad549eec183..d2a2329a4880 100644
--- a/sys/kern/kern_linker.c
+++ b/sys/kern/kern_linker.c
@@ -466,7 +466,7 @@ linker_make_file(const char *pathname, linker_class_t lc)
 }
 
 int
-linker_file_unload(linker_file_t file)
+linker_file_unload(linker_file_t file, int flags)
 {
 	module_t mod, next;
 	modlist_t ml, nextml;
@@ -500,7 +500,7 @@ linker_file_unload(linker_file_t file)
 			/*
 			 * Give the module a chance to veto the unload.
 			 */
-			if ((error = module_unload(mod)) != 0) {
+			if ((error = module_unload(mod, flags)) != 0) {
 				KLD_DPF(FILE, ("linker_file_unload: module %p"
 				    " vetoes unload\n", mod));
 				goto out;
@@ -536,7 +536,7 @@ linker_file_unload(linker_file_t file)
 
 	if (file->deps) {
 		for (i = 0; i < file->ndeps; i++)
-			linker_file_unload(file->deps[i]);
+			linker_file_unload(file->deps[i], flags);
 		free(file->deps, M_LINKER);
 		file->deps = NULL;
 	}
@@ -789,8 +789,8 @@ kldload(struct thread *td, struct kldload_args *uap)
 /*
  * MPSAFE
  */
-int
-kldunload(struct thread *td, struct kldunload_args *uap)
+static int
+kern_kldunload(struct thread *td, int fileid, int flags)
 {
 	linker_file_t lf;
 	int error = 0;
@@ -803,17 +803,20 @@ kldunload(struct thread *td, struct kldunload_args *uap)
 	if ((error = suser(td)) != 0)
 		goto out;
 
-	lf = linker_find_file_by_id(uap->fileid);
+	lf = linker_find_file_by_id(fileid);
 	if (lf) {
 		KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
 		if (lf->userrefs == 0) {
+			/*
+			 * XXX: maybe LINKER_UNLOAD_FORCE should override ?
+			 */
 			printf("kldunload: attempt to unload file that was"
 			    " loaded by the kernel\n");
 			error = EBUSY;
 			goto out;
 		}
 		lf->userrefs--;
-		error = linker_file_unload(lf);
+		error = linker_file_unload(lf, flags);
 		if (error)
 			lf->userrefs++;
 	} else
@@ -823,6 +826,29 @@ kldunload(struct thread *td, struct kldunload_args *uap)
 	return (error);
 }
 
+/*
+ * MPSAFE
+ */
+int
+kldunload(struct thread *td, struct kldunload_args *uap)
+{
+
+	return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL));
+}
+
+/*
+ * MPSAFE
+ */
+int
+kldunloadf(struct thread *td, struct kldunloadf_args *uap)
+{
+
+	if (uap->flags != LINKER_UNLOAD_NORMAL &&
+	    uap->flags != LINKER_UNLOAD_FORCE)
+		return (EINVAL);
+	return (kern_kldunload(td, uap->fileid, uap->flags));
+}
+
 /*
  * MPSAFE
  */
@@ -1250,7 +1276,8 @@ linker_preload(void *arg)
 					    nver) != NULL) {
 						printf("module %s already"
 						    " present!\n", modname);
-						linker_file_unload(lf);
+						linker_file_unload(lf,
+						    LINKER_UNLOAD_FORCE);
 						TAILQ_REMOVE(&loaded_files,
 						    lf, loaded);
 						/* we changed tailq next ptr */
@@ -1276,7 +1303,7 @@ linker_preload(void *arg)
 	 */
 	TAILQ_FOREACH(lf, &loaded_files, loaded) {
 		printf("KLD file %s is missing dependencies\n", lf->filename);
-		linker_file_unload(lf);
+		linker_file_unload(lf, LINKER_UNLOAD_FORCE);
 		TAILQ_REMOVE(&loaded_files, lf, loaded);
 	}
 
@@ -1317,7 +1344,7 @@ linker_preload(void *arg)
 		if (error) {
 			printf("KLD file %s - could not finalize loading\n",
 			    lf->filename);
-			linker_file_unload(lf);
+			linker_file_unload(lf, LINKER_UNLOAD_FORCE);
 			continue;
 		}
 		linker_file_register_modules(lf);
@@ -1676,7 +1703,7 @@ linker_load_module(const char *kldname, const char *modname,
 			break;
 		if (modname && verinfo &&
 		    modlist_lookup2(modname, verinfo) == NULL) {
-			linker_file_unload(lfdep);
+			linker_file_unload(lfdep, LINKER_UNLOAD_FORCE);
 			error = ENOENT;
 			break;
 		}
diff --git a/sys/kern/kern_module.c b/sys/kern/kern_module.c
index 3832922f5961..158612e822c1 100644
--- a/sys/kern/kern_module.c
+++ b/sys/kern/kern_module.c
@@ -215,9 +215,15 @@ module_lookupbyid(int modid)
 }
 
 int
-module_unload(module_t mod)
+module_unload(module_t mod, int flags)
 {
+	int error;
 
+	error = MOD_EVENT(mod, MOD_QUIESCE);
+	if (error == EOPNOTSUPP)
+		error = 0;
+	if (flags == LINKER_UNLOAD_NORMAL && error != 0)
+		return (error);
         return (MOD_EVENT(mod, MOD_UNLOAD));
 }
 
diff --git a/sys/kern/link_elf.c b/sys/kern/link_elf.c
index 0f00d904a978..5679cbf2f3fa 100644
--- a/sys/kern/link_elf.c
+++ b/sys/kern/link_elf.c
@@ -492,7 +492,7 @@ link_elf_link_preload(linker_class_t cls,
 
     error = parse_dynamic(ef);
     if (error) {
-	linker_file_unload(lf);
+	linker_file_unload(lf, LINKER_UNLOAD_FORCE);
 	return error;
     }
     link_elf_reloc_local(lf);
@@ -846,7 +846,7 @@ link_elf_load_file(linker_class_t cls, const char* filename,
 
 out:
     if (error && lf)
-	linker_file_unload(lf);
+	linker_file_unload(lf, LINKER_UNLOAD_FORCE);
     if (shdr)
 	free(shdr, M_LINKER);
     if (firstpage)
diff --git a/sys/kern/link_elf_obj.c b/sys/kern/link_elf_obj.c
index 9049880fe8fb..e5fa30e98045 100644
--- a/sys/kern/link_elf_obj.c
+++ b/sys/kern/link_elf_obj.c
@@ -588,7 +588,7 @@ link_elf_load_file(linker_class_t cls, const char *filename,
 
 out:
 	if (error && lf)
-		linker_file_unload(lf);
+		linker_file_unload(lf, LINKER_UNLOAD_FORCE);
 	if (hdr)
 		free(hdr, M_LINKER);
 	VOP_UNLOCK(nd.ni_vp, 0, td);
diff --git a/sys/kern/syscalls.c b/sys/kern/syscalls.c
index 202c7d136c77..9a2f79556b91 100644
--- a/sys/kern/syscalls.c
+++ b/sys/kern/syscalls.c
@@ -3,7 +3,7 @@
  *
  * DO NOT EDIT-- this file is automatically generated.
  * $FreeBSD$
- * created from FreeBSD: src/sys/kern/syscalls.master,v 1.174 2004/07/02 00:35:52 marcel Exp 
+ * created from FreeBSD: src/sys/kern/syscalls.master,v 1.176 2004/07/13 19:35:10 phk Exp 
  */
 
 const char *syscallnames[] = {
@@ -451,4 +451,5 @@ const char *syscallnames[] = {
 	"ksem_timedwait",			/* 441 = ksem_timedwait */
 	"thr_suspend",			/* 442 = thr_suspend */
 	"thr_wake",			/* 443 = thr_wake */
+	"kldunloadf",			/* 444 = kldunloadf */
 };
diff --git a/sys/kern/vfs_mount.c b/sys/kern/vfs_mount.c
index d697499a80a7..cf7b7c127257 100644
--- a/sys/kern/vfs_mount.c
+++ b/sys/kern/vfs_mount.c
@@ -799,7 +799,7 @@ vfs_domount(
 				break;
 		if (vfsp == NULL) {
 			lf->userrefs--;
-			linker_file_unload(lf);
+			linker_file_unload(lf, LINKER_UNLOAD_FORCE);
 			vput(vp);
 			return (ENODEV);
 		}
diff --git a/sys/sys/linker.h b/sys/sys/linker.h
index 1815c47a607f..923febeb95b2 100644
--- a/sys/sys/linker.h
+++ b/sys/sys/linker.h
@@ -135,7 +135,7 @@ linker_file_t linker_make_file(const char* _filename, linker_class_t _cls);
 /*
  * Unload a file, freeing up memory.
  */
-int linker_file_unload(linker_file_t _file);
+int linker_file_unload(linker_file_t _file, int flags);
 
 /*
  * Add a dependency to a file.
@@ -275,6 +275,12 @@ struct kld_sym_lookup {
 };
 #define KLDSYM_LOOKUP	1
 
+/*
+ * Flags for kldunloadf() and linker_file_unload()
+ */
+#define LINKER_UNLOAD_NORMAL	0
+#define LINKER_UNLOAD_FORCE	1
+
 #ifndef _KERNEL
 
 #include <sys/cdefs.h>
@@ -282,6 +288,7 @@ struct kld_sym_lookup {
 __BEGIN_DECLS
 int	kldload(const char* _file);
 int	kldunload(int _fileid);
+int	kldunloadf(int _fileid, int flags);
 int	kldfind(const char* _file);
 int	kldnext(int _fileid);
 int	kldstat(int _fileid, struct kld_file_stat* _stat);
diff --git a/sys/sys/module.h b/sys/sys/module.h
index 39f138d206b0..5beb9bb6f22c 100644
--- a/sys/sys/module.h
+++ b/sys/sys/module.h
@@ -42,7 +42,8 @@
 typedef enum modeventtype {
 	MOD_LOAD,
 	MOD_UNLOAD,
-	MOD_SHUTDOWN
+	MOD_SHUTDOWN,
+	MOD_QUIESCE
 } modeventtype_t;
 
 typedef struct module *module_t;
@@ -142,7 +143,7 @@ module_t	module_lookupbyname(const char *);
 module_t	module_lookupbyid(int);
 void	module_reference(module_t);
 void	module_release(module_t);
-int	module_unload(module_t);
+int	module_unload(module_t, int flags);
 int	module_getid(module_t);
 module_t	module_getfnext(module_t);
 void	module_setspecific(module_t, modspecific_t *);
diff --git a/sys/sys/syscall.h b/sys/sys/syscall.h
index 562de1331611..8767ff11aa82 100644
--- a/sys/sys/syscall.h
+++ b/sys/sys/syscall.h
@@ -3,7 +3,7 @@
  *
  * DO NOT EDIT-- this file is automatically generated.
  * $FreeBSD$
- * created from FreeBSD: src/sys/kern/syscalls.master,v 1.174 2004/07/02 00:35:52 marcel Exp 
+ * created from FreeBSD: src/sys/kern/syscalls.master,v 1.176 2004/07/13 19:35:10 phk Exp 
  */
 
 #define	SYS_syscall	0
@@ -356,4 +356,5 @@
 #define	SYS_ksem_timedwait	441
 #define	SYS_thr_suspend	442
 #define	SYS_thr_wake	443
-#define	SYS_MAXSYSCALL	444
+#define	SYS_kldunloadf	444
+#define	SYS_MAXSYSCALL	445
diff --git a/sys/sys/syscall.mk b/sys/sys/syscall.mk
index 2eac19a6abaf..9354f5aa7c63 100644
--- a/sys/sys/syscall.mk
+++ b/sys/sys/syscall.mk
@@ -1,7 +1,7 @@
 # FreeBSD system call names.
 # DO NOT EDIT-- this file is automatically generated.
 # $FreeBSD$
-# created from FreeBSD: src/sys/kern/syscalls.master,v 1.174 2004/07/02 00:35:52 marcel Exp 
+# created from FreeBSD: src/sys/kern/syscalls.master,v 1.176 2004/07/13 19:35:10 phk Exp 
 MIASM =  \
 	syscall.o \
 	exit.o \
@@ -297,4 +297,5 @@ MIASM =  \
 	kse_switchin.o \
 	ksem_timedwait.o \
 	thr_suspend.o \
-	thr_wake.o
+	thr_wake.o \
+	kldunloadf.o
diff --git a/sys/sys/sysproto.h b/sys/sys/sysproto.h
index a8e3a6b5a7dd..ff283636feca 100644
--- a/sys/sys/sysproto.h
+++ b/sys/sys/sysproto.h
@@ -3,7 +3,7 @@
  *
  * DO NOT EDIT-- this file is automatically generated.
  * $FreeBSD$
- * created from FreeBSD: src/sys/kern/syscalls.master,v 1.174 2004/07/02 00:35:52 marcel Exp 
+ * created from FreeBSD: src/sys/kern/syscalls.master,v 1.176 2004/07/13 19:35:10 phk Exp 
  */
 
 #ifndef _SYS_SYSPROTO_H_
@@ -1302,6 +1302,10 @@ struct thr_suspend_args {
 struct thr_wake_args {
 	char id_l_[PADL_(long)]; long id; char id_r_[PADR_(long)];
 };
+struct kldunloadf_args {
+	char fileid_l_[PADL_(int)]; int fileid; char fileid_r_[PADR_(int)];
+	char flags_l_[PADL_(int)]; int flags; char flags_r_[PADR_(int)];
+};
 int	nosys(struct thread *, struct nosys_args *);
 void	sys_exit(struct thread *, struct sys_exit_args *);
 int	fork(struct thread *, struct fork_args *);
@@ -1596,6 +1600,7 @@ int	kse_switchin(struct thread *, struct kse_switchin_args *);
 int	ksem_timedwait(struct thread *, struct ksem_timedwait_args *);
 int	thr_suspend(struct thread *, struct thr_suspend_args *);
 int	thr_wake(struct thread *, struct thr_wake_args *);
+int	kldunloadf(struct thread *, struct kldunloadf_args *);
 
 #ifdef COMPAT_43