linuxkpi: remove erronously committed diff save file

(cherry picked from commit 5b3b19db7305f8255f021d6f8d94d17ab778660f)

1 files changed, 0 insertions, 2615 deletions

diff --git a/sys/compat/linuxkpi/common/src/linux_compat.c.orig b/sys/compat/linuxkpi/common/src/linux_compat.c.orig
deleted file mode 100644
index 28413c59bb76..000000000000
--- a/sys/compat/linuxkpi/common/src/linux_compat.c.orig
+++ /dev/null
@@ -1,2615 +0,0 @@
-/*-
- * Copyright (c) 2010 Isilon Systems, Inc.
- * Copyright (c) 2010 iX Systems, Inc.
- * Copyright (c) 2010 Panasas, Inc.
- * Copyright (c) 2013-2018 Mellanox Technologies, Ltd.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice unmodified, this list of conditions, and the following
- *    disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#include "opt_stack.h"
-
-#include <sys/param.h>
-#include <sys/systm.h>
-#include <sys/malloc.h>
-#include <sys/kernel.h>
-#include <sys/sysctl.h>
-#include <sys/proc.h>
-#include <sys/sglist.h>
-#include <sys/sleepqueue.h>
-#include <sys/refcount.h>
-#include <sys/lock.h>
-#include <sys/mutex.h>
-#include <sys/bus.h>
-#include <sys/eventhandler.h>
-#include <sys/fcntl.h>
-#include <sys/file.h>
-#include <sys/filio.h>
-#include <sys/rwlock.h>
-#include <sys/mman.h>
-#include <sys/stack.h>
-#include <sys/time.h>
-#include <sys/user.h>
-
-#include <vm/vm.h>
-#include <vm/pmap.h>
-#include <vm/vm_object.h>
-#include <vm/vm_page.h>
-#include <vm/vm_pager.h>
-
-#include <machine/stdarg.h>
-
-#if defined(__i386__) || defined(__amd64__)
-#include <machine/md_var.h>
-#endif
-
-#include <linux/kobject.h>
-#include <linux/device.h>
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/cdev.h>
-#include <linux/file.h>
-#include <linux/sysfs.h>
-#include <linux/mm.h>
-#include <linux/io.h>
-#include <linux/vmalloc.h>
-#include <linux/netdevice.h>
-#include <linux/timer.h>
-#include <linux/interrupt.h>
-#include <linux/uaccess.h>
-#include <linux/list.h>
-#include <linux/kthread.h>
-#include <linux/kernel.h>
-#include <linux/compat.h>
-#include <linux/poll.h>
-#include <linux/smp.h>
-#include <linux/wait_bit.h>
-
-#if defined(__i386__) || defined(__amd64__)
-#include <asm/smp.h>
-#endif
-
-SYSCTL_NODE(_compat, OID_AUTO, linuxkpi, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
-    "LinuxKPI parameters");
-
-int linuxkpi_debug;
-SYSCTL_INT(_compat_linuxkpi, OID_AUTO, debug, CTLFLAG_RWTUN,
-    &linuxkpi_debug, 0, "Set to enable pr_debug() prints. Clear to disable.");
-
-static struct timeval lkpi_net_lastlog;
-static int lkpi_net_curpps;
-static int lkpi_net_maxpps = 99;
-SYSCTL_INT(_compat_linuxkpi, OID_AUTO, net_ratelimit, CTLFLAG_RWTUN,
-    &lkpi_net_maxpps, 0, "Limit number of LinuxKPI net messages per second.");
-
-MALLOC_DEFINE(M_KMALLOC, "linux", "Linux kmalloc compat");
-
-#include <linux/rbtree.h>
-/* Undo Linux compat changes. */
-#undef RB_ROOT
-#undef file
-#undef cdev
-#define	RB_ROOT(head)	(head)->rbh_root
-
-static void linux_cdev_deref(struct linux_cdev *ldev);
-static struct vm_area_struct *linux_cdev_handle_find(void *handle);
-
-struct kobject linux_class_root;
-struct device linux_root_device;
-struct class linux_class_misc;
-struct list_head pci_drivers;
-struct list_head pci_devices;
-spinlock_t pci_lock;
-
-unsigned long linux_timer_hz_mask;
-
-wait_queue_head_t linux_bit_waitq;
-wait_queue_head_t linux_var_waitq;
-
-int
-panic_cmp(struct rb_node *one, struct rb_node *two)
-{
-	panic("no cmp");
-}
-
-RB_GENERATE(linux_root, rb_node, __entry, panic_cmp);
-
-int
-kobject_set_name_vargs(struct kobject *kobj, const char *fmt, va_list args)
-{
-	va_list tmp_va;
-	int len;
-	char *old;
-	char *name;
-	char dummy;
-
-	old = kobj->name;
-
-	if (old && fmt == NULL)
-		return (0);
-
-	/* compute length of string */
-	va_copy(tmp_va, args);
-	len = vsnprintf(&dummy, 0, fmt, tmp_va);
-	va_end(tmp_va);
-
-	/* account for zero termination */
-	len++;
-
-	/* check for error */
-	if (len < 1)
-		return (-EINVAL);
-
-	/* allocate memory for string */
-	name = kzalloc(len, GFP_KERNEL);
-	if (name == NULL)
-		return (-ENOMEM);
-	vsnprintf(name, len, fmt, args);
-	kobj->name = name;
-
-	/* free old string */
-	kfree(old);
-
-	/* filter new string */
-	for (; *name != '\0'; name++)
-		if (*name == '/')
-			*name = '!';
-	return (0);
-}
-
-int
-kobject_set_name(struct kobject *kobj, const char *fmt, ...)
-{
-	va_list args;
-	int error;
-
-	va_start(args, fmt);
-	error = kobject_set_name_vargs(kobj, fmt, args);
-	va_end(args);
-
-	return (error);
-}
-
-static int
-kobject_add_complete(struct kobject *kobj, struct kobject *parent)
-{
-	const struct kobj_type *t;
-	int error;
-
-	kobj->parent = parent;
-	error = sysfs_create_dir(kobj);
-	if (error == 0 && kobj->ktype && kobj->ktype->default_attrs) {
-		struct attribute **attr;
-		t = kobj->ktype;
-
-		for (attr = t->default_attrs; *attr != NULL; attr++) {
-			error = sysfs_create_file(kobj, *attr);
-			if (error)
-				break;
-		}
-		if (error)
-			sysfs_remove_dir(kobj);
-	}
-	return (error);
-}
-
-int
-kobject_add(struct kobject *kobj, struct kobject *parent, const char *fmt, ...)
-{
-	va_list args;
-	int error;
-
-	va_start(args, fmt);
-	error = kobject_set_name_vargs(kobj, fmt, args);
-	va_end(args);
-	if (error)
-		return (error);
-
-	return kobject_add_complete(kobj, parent);
-}
-
-void
-linux_kobject_release(struct kref *kref)
-{
-	struct kobject *kobj;
-	char *name;
-
-	kobj = container_of(kref, struct kobject, kref);
-	sysfs_remove_dir(kobj);
-	name = kobj->name;
-	if (kobj->ktype && kobj->ktype->release)
-		kobj->ktype->release(kobj);
-	kfree(name);
-}
-
-static void
-linux_kobject_kfree(struct kobject *kobj)
-{
-	kfree(kobj);
-}
-
-static void
-linux_kobject_kfree_name(struct kobject *kobj)
-{
-	if (kobj) {
-		kfree(kobj->name);
-	}
-}
-
-const struct kobj_type linux_kfree_type = {
-	.release = linux_kobject_kfree
-};
-
-static void
-linux_device_release(struct device *dev)
-{
-	pr_debug("linux_device_release: %s\n", dev_name(dev));
-	kfree(dev);
-}
-
-static ssize_t
-linux_class_show(struct kobject *kobj, struct attribute *attr, char *buf)
-{
-	struct class_attribute *dattr;
-	ssize_t error;
-
-	dattr = container_of(attr, struct class_attribute, attr);
-	error = -EIO;
-	if (dattr->show)
-		error = dattr->show(container_of(kobj, struct class, kobj),
-		    dattr, buf);
-	return (error);
-}
-
-static ssize_t
-linux_class_store(struct kobject *kobj, struct attribute *attr, const char *buf,
-    size_t count)
-{
-	struct class_attribute *dattr;
-	ssize_t error;
-
-	dattr = container_of(attr, struct class_attribute, attr);
-	error = -EIO;
-	if (dattr->store)
-		error = dattr->store(container_of(kobj, struct class, kobj),
-		    dattr, buf, count);
-	return (error);
-}
-
-static void
-linux_class_release(struct kobject *kobj)
-{
-	struct class *class;
-
-	class = container_of(kobj, struct class, kobj);
-	if (class->class_release)
-		class->class_release(class);
-}
-
-static const struct sysfs_ops linux_class_sysfs = {
-	.show  = linux_class_show,
-	.store = linux_class_store,
-};
-
-const struct kobj_type linux_class_ktype = {
-	.release = linux_class_release,
-	.sysfs_ops = &linux_class_sysfs
-};
-
-static void
-linux_dev_release(struct kobject *kobj)
-{
-	struct device *dev;
-
-	dev = container_of(kobj, struct device, kobj);
-	/* This is the precedence defined by linux. */
-	if (dev->release)
-		dev->release(dev);
-	else if (dev->class && dev->class->dev_release)
-		dev->class->dev_release(dev);
-}
-
-static ssize_t
-linux_dev_show(struct kobject *kobj, struct attribute *attr, char *buf)
-{
-	struct device_attribute *dattr;
-	ssize_t error;
-
-	dattr = container_of(attr, struct device_attribute, attr);
-	error = -EIO;
-	if (dattr->show)
-		error = dattr->show(container_of(kobj, struct device, kobj),
-		    dattr, buf);
-	return (error);
-}
-
-static ssize_t
-linux_dev_store(struct kobject *kobj, struct attribute *attr, const char *buf,
-    size_t count)
-{
-	struct device_attribute *dattr;
-	ssize_t error;
-
-	dattr = container_of(attr, struct device_attribute, attr);
-	error = -EIO;
-	if (dattr->store)
-		error = dattr->store(container_of(kobj, struct device, kobj),
-		    dattr, buf, count);
-	return (error);
-}
-
-static const struct sysfs_ops linux_dev_sysfs = {
-	.show  = linux_dev_show,
-	.store = linux_dev_store,
-};
-
-const struct kobj_type linux_dev_ktype = {
-	.release = linux_dev_release,
-	.sysfs_ops = &linux_dev_sysfs
-};
-
-struct device *
-device_create(struct class *class, struct device *parent, dev_t devt,
-    void *drvdata, const char *fmt, ...)
-{
-	struct device *dev;
-	va_list args;
-
-	dev = kzalloc(sizeof(*dev), M_WAITOK);
-	dev->parent = parent;
-	dev->class = class;
-	dev->devt = devt;
-	dev->driver_data = drvdata;
-	dev->release = linux_device_release;
-	va_start(args, fmt);
-	kobject_set_name_vargs(&dev->kobj, fmt, args);
-	va_end(args);
-	device_register(dev);
-
-	return (dev);
-}
-
-int
-kobject_init_and_add(struct kobject *kobj, const struct kobj_type *ktype,
-    struct kobject *parent, const char *fmt, ...)
-{
-	va_list args;
-	int error;
-
-	kobject_init(kobj, ktype);
-	kobj->ktype = ktype;
-	kobj->parent = parent;
-	kobj->name = NULL;
-
-	va_start(args, fmt);
-	error = kobject_set_name_vargs(kobj, fmt, args);
-	va_end(args);
-	if (error)
-		return (error);
-	return kobject_add_complete(kobj, parent);
-}
-
-static void
-linux_kq_lock(void *arg)
-{
-	spinlock_t *s = arg;
-
-	spin_lock(s);
-}
-static void
-linux_kq_unlock(void *arg)
-{
-	spinlock_t *s = arg;
-
-	spin_unlock(s);
-}
-
-static void
-linux_kq_assert_lock(void *arg, int what)
-{
-#ifdef INVARIANTS
-	spinlock_t *s = arg;
-
-	if (what == LA_LOCKED)
-		mtx_assert(&s->m, MA_OWNED);
-	else
-		mtx_assert(&s->m, MA_NOTOWNED);
-#endif
-}
-
-static void
-linux_file_kqfilter_poll(struct linux_file *, int);
-
-struct linux_file *
-linux_file_alloc(void)
-{
-	struct linux_file *filp;
-
-	filp = kzalloc(sizeof(*filp), GFP_KERNEL);
-
-	/* set initial refcount */
-	filp->f_count = 1;
-
-	/* setup fields needed by kqueue support */
-	spin_lock_init(&filp->f_kqlock);
-	knlist_init(&filp->f_selinfo.si_note, &filp->f_kqlock,
-	    linux_kq_lock, linux_kq_unlock, linux_kq_assert_lock);
-
-	return (filp);
-}
-
-void
-linux_file_free(struct linux_file *filp)
-{
-	if (filp->_file == NULL) {
-		if (filp->f_shmem != NULL)
-			vm_object_deallocate(filp->f_shmem);
-		kfree(filp);
-	} else {
-		/*
-		 * The close method of the character device or file
-		 * will free the linux_file structure:
-		 */
-		_fdrop(filp->_file, curthread);
-	}
-}
-
-static int
-linux_cdev_pager_fault(vm_object_t vm_obj, vm_ooffset_t offset, int prot,
-    vm_page_t *mres)
-{
-	struct vm_area_struct *vmap;
-
-	vmap = linux_cdev_handle_find(vm_obj->handle);
-
-	MPASS(vmap != NULL);
-	MPASS(vmap->vm_private_data == vm_obj->handle);
-
-	if (likely(vmap->vm_ops != NULL && offset < vmap->vm_len)) {
-		vm_paddr_t paddr = IDX_TO_OFF(vmap->vm_pfn) + offset;
-		vm_page_t page;
-
-		if (((*mres)->flags & PG_FICTITIOUS) != 0) {
-			/*
-			 * If the passed in result page is a fake
-			 * page, update it with the new physical
-			 * address.
-			 */
-			page = *mres;
-			vm_page_updatefake(page, paddr, vm_obj->memattr);
-		} else {
-			/*
-			 * Replace the passed in "mres" page with our
-			 * own fake page and free up the all of the
-			 * original pages.
-			 */
-			VM_OBJECT_WUNLOCK(vm_obj);
-			page = vm_page_getfake(paddr, vm_obj->memattr);
-			VM_OBJECT_WLOCK(vm_obj);
-
-			vm_page_replace(page, vm_obj, (*mres)->pindex, *mres);
-			*mres = page;
-		}
-		vm_page_valid(page);
-		return (VM_PAGER_OK);
-	}
-	return (VM_PAGER_FAIL);
-}
-
-static int
-linux_cdev_pager_populate(vm_object_t vm_obj, vm_pindex_t pidx, int fault_type,
-    vm_prot_t max_prot, vm_pindex_t *first, vm_pindex_t *last)
-{
-	struct vm_area_struct *vmap;
-	int err;
-
-	/* get VM area structure */
-	vmap = linux_cdev_handle_find(vm_obj->handle);
-	MPASS(vmap != NULL);
-	MPASS(vmap->vm_private_data == vm_obj->handle);
-
-	VM_OBJECT_WUNLOCK(vm_obj);
-
-	linux_set_current(curthread);
-
-	down_write(&vmap->vm_mm->mmap_sem);
-	if (unlikely(vmap->vm_ops == NULL)) {
-		err = VM_FAULT_SIGBUS;
-	} else {
-		struct vm_fault vmf;
-
-		/* fill out VM fault structure */
-		vmf.virtual_address = (void *)(uintptr_t)IDX_TO_OFF(pidx);
-		vmf.flags = (fault_type & VM_PROT_WRITE) ? FAULT_FLAG_WRITE : 0;
-		vmf.pgoff = 0;
-		vmf.page = NULL;
-		vmf.vma = vmap;
-
-		vmap->vm_pfn_count = 0;
-		vmap->vm_pfn_pcount = &vmap->vm_pfn_count;
-		vmap->vm_obj = vm_obj;
-
-		err = vmap->vm_ops->fault(vmap, &vmf);
-
-		while (vmap->vm_pfn_count == 0 && err == VM_FAULT_NOPAGE) {
-			kern_yield(PRI_USER);
-			err = vmap->vm_ops->fault(vmap, &vmf);
-		}
-	}
-
-	/* translate return code */
-	switch (err) {
-	case VM_FAULT_OOM:
-		err = VM_PAGER_AGAIN;
-		break;
-	case VM_FAULT_SIGBUS:
-		err = VM_PAGER_BAD;
-		break;
-	case VM_FAULT_NOPAGE:
-		/*
-		 * By contract the fault handler will return having
-		 * busied all the pages itself. If pidx is already
-		 * found in the object, it will simply xbusy the first
-		 * page and return with vm_pfn_count set to 1.
-		 */
-		*first = vmap->vm_pfn_first;
-		*last = *first + vmap->vm_pfn_count - 1;
-		err = VM_PAGER_OK;
-		break;
-	default:
-		err = VM_PAGER_ERROR;
-		break;
-	}
-	up_write(&vmap->vm_mm->mmap_sem);
-	VM_OBJECT_WLOCK(vm_obj);
-	return (err);
-}
-
-static struct rwlock linux_vma_lock;
-static TAILQ_HEAD(, vm_area_struct) linux_vma_head =
-    TAILQ_HEAD_INITIALIZER(linux_vma_head);
-
-static void
-linux_cdev_handle_free(struct vm_area_struct *vmap)
-{
-	/* Drop reference on vm_file */
-	if (vmap->vm_file != NULL)
-		fput(vmap->vm_file);
-
-	/* Drop reference on mm_struct */
-	mmput(vmap->vm_mm);
-
-	kfree(vmap);
-}
-
-static void
-linux_cdev_handle_remove(struct vm_area_struct *vmap)
-{
-	rw_wlock(&linux_vma_lock);
-	TAILQ_REMOVE(&linux_vma_head, vmap, vm_entry);
-	rw_wunlock(&linux_vma_lock);
-}
-
-static struct vm_area_struct *
-linux_cdev_handle_find(void *handle)
-{
-	struct vm_area_struct *vmap;
-
-	rw_rlock(&linux_vma_lock);
-	TAILQ_FOREACH(vmap, &linux_vma_head, vm_entry) {
-		if (vmap->vm_private_data == handle)
-			break;
-	}
-	rw_runlock(&linux_vma_lock);
-	return (vmap);
-}
-
-static int
-linux_cdev_pager_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot,
-		      vm_ooffset_t foff, struct ucred *cred, u_short *color)
-{
-
-	MPASS(linux_cdev_handle_find(handle) != NULL);
-	*color = 0;
-	return (0);
-}
-
-static void
-linux_cdev_pager_dtor(void *handle)
-{
-	const struct vm_operations_struct *vm_ops;
-	struct vm_area_struct *vmap;
-
-	vmap = linux_cdev_handle_find(handle);
-	MPASS(vmap != NULL);
-
-	/*
-	 * Remove handle before calling close operation to prevent
-	 * other threads from reusing the handle pointer.
-	 */
-	linux_cdev_handle_remove(vmap);
-
-	down_write(&vmap->vm_mm->mmap_sem);
-	vm_ops = vmap->vm_ops;
-	if (likely(vm_ops != NULL))
-		vm_ops->close(vmap);
-	up_write(&vmap->vm_mm->mmap_sem);
-
-	linux_cdev_handle_free(vmap);
-}
-
-static struct cdev_pager_ops linux_cdev_pager_ops[2] = {
-  {
-	/* OBJT_MGTDEVICE */
-	.cdev_pg_populate	= linux_cdev_pager_populate,
-	.cdev_pg_ctor	= linux_cdev_pager_ctor,
-	.cdev_pg_dtor	= linux_cdev_pager_dtor
-  },
-  {
-	/* OBJT_DEVICE */
-	.cdev_pg_fault	= linux_cdev_pager_fault,
-	.cdev_pg_ctor	= linux_cdev_pager_ctor,
-	.cdev_pg_dtor	= linux_cdev_pager_dtor
-  },
-};
-
-int
-zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
-    unsigned long size)
-{
-	vm_object_t obj;
-	vm_page_t m;
-
-	obj = vma->vm_obj;
-	if (obj == NULL || (obj->flags & OBJ_UNMANAGED) != 0)
-		return (-ENOTSUP);
-	VM_OBJECT_RLOCK(obj);
-	for (m = vm_page_find_least(obj, OFF_TO_IDX(address));
-	    m != NULL && m->pindex < OFF_TO_IDX(address + size);
-	    m = TAILQ_NEXT(m, listq))
-		pmap_remove_all(m);
-	VM_OBJECT_RUNLOCK(obj);
-	return (0);
-}
-
-static struct file_operations dummy_ldev_ops = {
-	/* XXXKIB */
-};
-
-static struct linux_cdev dummy_ldev = {
-	.ops = &dummy_ldev_ops,
-};
-
-#define	LDEV_SI_DTR	0x0001
-#define	LDEV_SI_REF	0x0002
-
-static void
-linux_get_fop(struct linux_file *filp, const struct file_operations **fop,
-    struct linux_cdev **dev)
-{
-	struct linux_cdev *ldev;
-	u_int siref;
-
-	ldev = filp->f_cdev;
-	*fop = filp->f_op;
-	if (ldev != NULL) {
-		if (ldev->kobj.ktype == &linux_cdev_static_ktype) {
-			refcount_acquire(&ldev->refs);
-		} else {
-			for (siref = ldev->siref;;) {
-				if ((siref & LDEV_SI_DTR) != 0) {
-					ldev = &dummy_ldev;
-					*fop = ldev->ops;
-					siref = ldev->siref;
-					MPASS((ldev->siref & LDEV_SI_DTR) == 0);
-				} else if (atomic_fcmpset_int(&ldev->siref,
-				    &siref, siref + LDEV_SI_REF)) {
-					break;
-				}
-			}
-		}
-	}
-	*dev = ldev;
-}
-
-static void
-linux_drop_fop(struct linux_cdev *ldev)
-{
-
-	if (ldev == NULL)
-		return;
-	if (ldev->kobj.ktype == &linux_cdev_static_ktype) {
-		linux_cdev_deref(ldev);
-	} else {
-		MPASS(ldev->kobj.ktype == &linux_cdev_ktype);
-		MPASS((ldev->siref & ~LDEV_SI_DTR) != 0);
-		atomic_subtract_int(&ldev->siref, LDEV_SI_REF);
-	}
-}
-
-#define	OPW(fp,td,code) ({			\
-	struct file *__fpop;			\
-	__typeof(code) __retval;		\
-						\
-	__fpop = (td)->td_fpop;			\
-	(td)->td_fpop = (fp);			\
-	__retval = (code);			\
-	(td)->td_fpop = __fpop;			\
-	__retval;				\
-})
-
-static int
-linux_dev_fdopen(struct cdev *dev, int fflags, struct thread *td,
-    struct file *file)
-{
-	struct linux_cdev *ldev;
-	struct linux_file *filp;
-	const struct file_operations *fop;
-	int error;
-
-	ldev = dev->si_drv1;
-
-	filp = linux_file_alloc();
-	filp->f_dentry = &filp->f_dentry_store;
-	filp->f_op = ldev->ops;
-	filp->f_mode = file->f_flag;
-	filp->f_flags = file->f_flag;
-	filp->f_vnode = file->f_vnode;
-	filp->_file = file;
-	refcount_acquire(&ldev->refs);
-	filp->f_cdev = ldev;
-
-	linux_set_current(td);
-	linux_get_fop(filp, &fop, &ldev);
-
-	if (fop->open != NULL) {
-		error = -fop->open(file->f_vnode, filp);
-		if (error != 0) {
-			linux_drop_fop(ldev);
-			linux_cdev_deref(filp->f_cdev);
-			kfree(filp);
-			return (error);
-		}
-	}
-
-	/* hold on to the vnode - used for fstat() */
-	vhold(filp->f_vnode);
-
-	/* release the file from devfs */
-	finit(file, filp->f_mode, DTYPE_DEV, filp, &linuxfileops);
-	linux_drop_fop(ldev);
-	return (ENXIO);
-}
-
-#define	LINUX_IOCTL_MIN_PTR 0x10000UL
-#define	LINUX_IOCTL_MAX_PTR (LINUX_IOCTL_MIN_PTR + IOCPARM_MAX)
-
-static inline int
-linux_remap_address(void **uaddr, size_t len)
-{
-	uintptr_t uaddr_val = (uintptr_t)(*uaddr);
-
-	if (unlikely(uaddr_val >= LINUX_IOCTL_MIN_PTR &&
-	    uaddr_val < LINUX_IOCTL_MAX_PTR)) {
-		struct task_struct *pts = current;
-		if (pts == NULL) {
-			*uaddr = NULL;
-			return (1);
-		}
-
-		/* compute data offset */
-		uaddr_val -= LINUX_IOCTL_MIN_PTR;
-
-		/* check that length is within bounds */
-		if ((len > IOCPARM_MAX) ||
-		    (uaddr_val + len) > pts->bsd_ioctl_len) {
-			*uaddr = NULL;
-			return (1);
-		}
-
-		/* re-add kernel buffer address */
-		uaddr_val += (uintptr_t)pts->bsd_ioctl_data;
-
-		/* update address location */
-		*uaddr = (void *)uaddr_val;
-		return (1);
-	}
-	return (0);
-}
-
-int
-linux_copyin(const void *uaddr, void *kaddr, size_t len)
-{
-	if (linux_remap_address(__DECONST(void **, &uaddr), len)) {
-		if (uaddr == NULL)
-			return (-EFAULT);
-		memcpy(kaddr, uaddr, len);
-		return (0);
-	}
-	return (-copyin(uaddr, kaddr, len));
-}
-
-int
-linux_copyout(const void *kaddr, void *uaddr, size_t len)
-{
-	if (linux_remap_address(&uaddr, len)) {
-		if (uaddr == NULL)
-			return (-EFAULT);
-		memcpy(uaddr, kaddr, len);
-		return (0);
-	}
-	return (-copyout(kaddr, uaddr, len));
-}
-
-size_t
-linux_clear_user(void *_uaddr, size_t _len)
-{
-	uint8_t *uaddr = _uaddr;
-	size_t len = _len;
-
-	/* make sure uaddr is aligned before going into the fast loop */
-	while (((uintptr_t)uaddr & 7) != 0 && len > 7) {
-		if (subyte(uaddr, 0))
-			return (_len);
-		uaddr++;
-		len--;
-	}
-
-	/* zero 8 bytes at a time */
-	while (len > 7) {
-#ifdef __LP64__
-		if (suword64(uaddr, 0))
-			return (_len);
-#else
-		if (suword32(uaddr, 0))
-			return (_len);
-		if (suword32(uaddr + 4, 0))
-			return (_len);
-#endif
-		uaddr += 8;
-		len -= 8;
-	}
-
-	/* zero fill end, if any */
-	while (len > 0) {
-		if (subyte(uaddr, 0))
-			return (_len);
-		uaddr++;
-		len--;
-	}
-	return (0);
-}
-
-int
-linux_access_ok(const void *uaddr, size_t len)
-{
-	uintptr_t saddr;
-	uintptr_t eaddr;
-
-	/* get start and end address */
-	saddr = (uintptr_t)uaddr;
-	eaddr = (uintptr_t)uaddr + len;
-
-	/* verify addresses are valid for userspace */
-	return ((saddr == eaddr) ||
-	    (eaddr > saddr && eaddr <= VM_MAXUSER_ADDRESS));
-}
-
-/*
- * This function should return either EINTR or ERESTART depending on
- * the signal type sent to this thread:
- */
-static int
-linux_get_error(struct task_struct *task, int error)
-{
-	/* check for signal type interrupt code */
-	if (error == EINTR || error == ERESTARTSYS || error == ERESTART) {
-		error = -linux_schedule_get_interrupt_value(task);
-		if (error == 0)
-			error = EINTR;
-	}
-	return (error);
-}
-
-static int
-linux_file_ioctl_sub(struct file *fp, struct linux_file *filp,
-    const struct file_operations *fop, u_long cmd, caddr_t data,
-    struct thread *td)
-{
-	struct task_struct *task = current;
-	unsigned size;
-	int error;
-
-	size = IOCPARM_LEN(cmd);
-	/* refer to logic in sys_ioctl() */
-	if (size > 0) {
-		/*
-		 * Setup hint for linux_copyin() and linux_copyout().
-		 *
-		 * Background: Linux code expects a user-space address
-		 * while FreeBSD supplies a kernel-space address.
-		 */
-		task->bsd_ioctl_data = data;
-		task->bsd_ioctl_len = size;
-		data = (void *)LINUX_IOCTL_MIN_PTR;
-	} else {
-		/* fetch user-space pointer */
-		data = *(void **)data;
-	}
-#if defined(__amd64__)
-	if (td->td_proc->p_elf_machine == EM_386) {
-		/* try the compat IOCTL handler first */
-		if (fop->compat_ioctl != NULL) {
-			error = -OPW(fp, td, fop->compat_ioctl(filp,
-			    cmd, (u_long)data));
-		} else {
-			error = ENOTTY;
-		}
-
-		/* fallback to the regular IOCTL handler, if any */
-		if (error == ENOTTY && fop->unlocked_ioctl != NULL) {
-			error = -OPW(fp, td, fop->unlocked_ioctl(filp,
-			    cmd, (u_long)data));
-		}
-	} else
-#endif
-	{
-		if (fop->unlocked_ioctl != NULL) {
-			error = -OPW(fp, td, fop->unlocked_ioctl(filp,
-			    cmd, (u_long)data));
-		} else {
-			error = ENOTTY;
-		}
-	}
-	if (size > 0) {
-		task->bsd_ioctl_data = NULL;
-		task->bsd_ioctl_len = 0;
-	}
-
-	if (error == EWOULDBLOCK) {
-		/* update kqfilter status, if any */
-		linux_file_kqfilter_poll(filp,
-		    LINUX_KQ_FLAG_HAS_READ | LINUX_KQ_FLAG_HAS_WRITE);
-	} else {
-		error = linux_get_error(task, error);
-	}
-	return (error);
-}
-
-#define	LINUX_POLL_TABLE_NORMAL ((poll_table *)1)
-
-/*
- * This function atomically updates the poll wakeup state and returns
- * the previous state at the time of update.
- */
-static uint8_t
-linux_poll_wakeup_state(atomic_t *v, const uint8_t *pstate)
-{
-	int c, old;
-
-	c = v->counter;
-
-	while ((old = atomic_cmpxchg(v, c, pstate[c])) != c)
-		c = old;
-
-	return (c);
-}
-
-static int
-linux_poll_wakeup_callback(wait_queue_t *wq, unsigned int wq_state, int flags, void *key)
-{
-	static const uint8_t state[LINUX_FWQ_STATE_MAX] = {
-		[LINUX_FWQ_STATE_INIT] = LINUX_FWQ_STATE_INIT, /* NOP */
-		[LINUX_FWQ_STATE_NOT_READY] = LINUX_FWQ_STATE_NOT_READY, /* NOP */
-		[LINUX_FWQ_STATE_QUEUED] = LINUX_FWQ_STATE_READY,
-		[LINUX_FWQ_STATE_READY] = LINUX_FWQ_STATE_READY, /* NOP */
-	};
-	struct linux_file *filp = container_of(wq, struct linux_file, f_wait_queue.wq);
-
-	switch (linux_poll_wakeup_state(&filp->f_wait_queue.state, state)) {
-	case LINUX_FWQ_STATE_QUEUED:
-		linux_poll_wakeup(filp);
-		return (1);
-	default:
-		return (0);
-	}
-}
-
-void
-linux_poll_wait(struct linux_file *filp, wait_queue_head_t *wqh, poll_table *p)
-{
-	static const uint8_t state[LINUX_FWQ_STATE_MAX] = {
-		[LINUX_FWQ_STATE_INIT] = LINUX_FWQ_STATE_NOT_READY,
-		[LINUX_FWQ_STATE_NOT_READY] = LINUX_FWQ_STATE_NOT_READY, /* NOP */
-		[LINUX_FWQ_STATE_QUEUED] = LINUX_FWQ_STATE_QUEUED, /* NOP */
-		[LINUX_FWQ_STATE_READY] = LINUX_FWQ_STATE_QUEUED,
-	};
-
-	/* check if we are called inside the select system call */
-	if (p == LINUX_POLL_TABLE_NORMAL)
-		selrecord(curthread, &filp->f_selinfo);
-
-	switch (linux_poll_wakeup_state(&filp->f_wait_queue.state, state)) {
-	case LINUX_FWQ_STATE_INIT:
-		/* NOTE: file handles can only belong to one wait-queue */
-		filp->f_wait_queue.wqh = wqh;
-		filp->f_wait_queue.wq.func = &linux_poll_wakeup_callback;
-		add_wait_queue(wqh, &filp->f_wait_queue.wq);
-		atomic_set(&filp->f_wait_queue.state, LINUX_FWQ_STATE_QUEUED);
-		break;
-	default:
-		break;
-	}
-}
-
-static void
-linux_poll_wait_dequeue(struct linux_file *filp)
-{
-	static const uint8_t state[LINUX_FWQ_STATE_MAX] = {
-		[LINUX_FWQ_STATE_INIT] = LINUX_FWQ_STATE_INIT,	/* NOP */
-		[LINUX_FWQ_STATE_NOT_READY] = LINUX_FWQ_STATE_INIT,
-		[LINUX_FWQ_STATE_QUEUED] = LINUX_FWQ_STATE_INIT,
-		[LINUX_FWQ_STATE_READY] = LINUX_FWQ_STATE_INIT,
-	};
-
-	seldrain(&filp->f_selinfo);
-
-	switch (linux_poll_wakeup_state(&filp->f_wait_queue.state, state)) {
-	case LINUX_FWQ_STATE_NOT_READY:
-	case LINUX_FWQ_STATE_QUEUED:
-	case LINUX_FWQ_STATE_READY:
-		remove_wait_queue(filp->f_wait_queue.wqh, &filp->f_wait_queue.wq);
-		break;
-	default:
-		break;
-	}
-}
-
-void
-linux_poll_wakeup(struct linux_file *filp)
-{
-	/* this function should be NULL-safe */
-	if (filp == NULL)
-		return;
-
-	selwakeup(&filp->f_selinfo);
-
-	spin_lock(&filp->f_kqlock);
-	filp->f_kqflags |= LINUX_KQ_FLAG_NEED_READ |
-	    LINUX_KQ_FLAG_NEED_WRITE;
-
-	/* make sure the "knote" gets woken up */
-	KNOTE_LOCKED(&filp->f_selinfo.si_note, 1);
-	spin_unlock(&filp->f_kqlock);
-}
-
-static void
-linux_file_kqfilter_detach(struct knote *kn)
-{
-	struct linux_file *filp = kn->kn_hook;
-
-	spin_lock(&filp->f_kqlock);
-	knlist_remove(&filp->f_selinfo.si_note, kn, 1);
-	spin_unlock(&filp->f_kqlock);
-}
-
-static int
-linux_file_kqfilter_read_event(struct knote *kn, long hint)
-{
-	struct linux_file *filp = kn->kn_hook;
-
-	mtx_assert(&filp->f_kqlock.m, MA_OWNED);
-
-	return ((filp->f_kqflags & LINUX_KQ_FLAG_NEED_READ) ? 1 : 0);
-}
-
-static int
-linux_file_kqfilter_write_event(struct knote *kn, long hint)
-{
-	struct linux_file *filp = kn->kn_hook;
-
-	mtx_assert(&filp->f_kqlock.m, MA_OWNED);
-
-	return ((filp->f_kqflags & LINUX_KQ_FLAG_NEED_WRITE) ? 1 : 0);
-}
-
-static struct filterops linux_dev_kqfiltops_read = {
-	.f_isfd = 1,
-	.f_detach = linux_file_kqfilter_detach,
-	.f_event = linux_file_kqfilter_read_event,
-};
-
-static struct filterops linux_dev_kqfiltops_write = {
-	.f_isfd = 1,
-	.f_detach = linux_file_kqfilter_detach,
-	.f_event = linux_file_kqfilter_write_event,
-};
-
-static void
-linux_file_kqfilter_poll(struct linux_file *filp, int kqflags)
-{
-	struct thread *td;
-	const struct file_operations *fop;
-	struct linux_cdev *ldev;
-	int temp;
-
-	if ((filp->f_kqflags & kqflags) == 0)
-		return;
-
-	td = curthread;
-
-	linux_get_fop(filp, &fop, &ldev);
-	/* get the latest polling state */
-	temp = OPW(filp->_file, td, fop->poll(filp, NULL));
-	linux_drop_fop(ldev);
-
-	spin_lock(&filp->f_kqlock);
-	/* clear kqflags */
-	filp->f_kqflags &= ~(LINUX_KQ_FLAG_NEED_READ |
-	    LINUX_KQ_FLAG_NEED_WRITE);
-	/* update kqflags */
-	if ((temp & (POLLIN | POLLOUT)) != 0) {
-		if ((temp & POLLIN) != 0)
-			filp->f_kqflags |= LINUX_KQ_FLAG_NEED_READ;
-		if ((temp & POLLOUT) != 0)
-			filp->f_kqflags |= LINUX_KQ_FLAG_NEED_WRITE;
-
-		/* make sure the "knote" gets woken up */
-		KNOTE_LOCKED(&filp->f_selinfo.si_note, 0);
-	}
-	spin_unlock(&filp->f_kqlock);
-}
-
-static int
-linux_file_kqfilter(struct file *file, struct knote *kn)
-{
-	struct linux_file *filp;
-	struct thread *td;
-	int error;
-
-	td = curthread;
-	filp = (struct linux_file *)file->f_data;
-	filp->f_flags = file->f_flag;
-	if (filp->f_op->poll == NULL)
-		return (EINVAL);
-
-	spin_lock(&filp->f_kqlock);
-	switch (kn->kn_filter) {
-	case EVFILT_READ:
-		filp->f_kqflags |= LINUX_KQ_FLAG_HAS_READ;
-		kn->kn_fop = &linux_dev_kqfiltops_read;
-		kn->kn_hook = filp;
-		knlist_add(&filp->f_selinfo.si_note, kn, 1);
-		error = 0;
-		break;
-	case EVFILT_WRITE:
-		filp->f_kqflags |= LINUX_KQ_FLAG_HAS_WRITE;
-		kn->kn_fop = &linux_dev_kqfiltops_write;
-		kn->kn_hook = filp;
-		knlist_add(&filp->f_selinfo.si_note, kn, 1);
-		error = 0;
-		break;
-	default:
-		error = EINVAL;
-		break;
-	}
-	spin_unlock(&filp->f_kqlock);
-
-	if (error == 0) {
-		linux_set_current(td);
-
-		/* update kqfilter status, if any */
-		linux_file_kqfilter_poll(filp,
-		    LINUX_KQ_FLAG_HAS_READ | LINUX_KQ_FLAG_HAS_WRITE);
-	}
-	return (error);
-}
-
-static int
-linux_file_mmap_single(struct file *fp, const struct file_operations *fop,
-    vm_ooffset_t *offset, vm_size_t size, struct vm_object **object,
-    int nprot, struct thread *td)
-{
-	struct task_struct *task;
-	struct vm_area_struct *vmap;
-	struct mm_struct *mm;
-	struct linux_file *filp;
-	vm_memattr_t attr;
-	int error;
-
-	filp = (struct linux_file *)fp->f_data;
-	filp->f_flags = fp->f_flag;
-
-	if (fop->mmap == NULL)
-		return (EOPNOTSUPP);
-
-	linux_set_current(td);
-
-	/*
-	 * The same VM object might be shared by multiple processes
-	 * and the mm_struct is usually freed when a process exits.
-	 *
-	 * The atomic reference below makes sure the mm_struct is
-	 * available as long as the vmap is in the linux_vma_head.
-	 */
-	task = current;
-	mm = task->mm;
-	if (atomic_inc_not_zero(&mm->mm_users) == 0)
-		return (EINVAL);
-
-	vmap = kzalloc(sizeof(*vmap), GFP_KERNEL);
-	vmap->vm_start = 0;
-	vmap->vm_end = size;
-	vmap->vm_pgoff = *offset / PAGE_SIZE;
-	vmap->vm_pfn = 0;
-	vmap->vm_flags = vmap->vm_page_prot = (nprot & VM_PROT_ALL);
-	vmap->vm_ops = NULL;
-	vmap->vm_file = get_file(filp);
-	vmap->vm_mm = mm;
-
-	if (unlikely(down_write_killable(&vmap->vm_mm->mmap_sem))) {
-		error = linux_get_error(task, EINTR);
-	} else {
-		error = -OPW(fp, td, fop->mmap(filp, vmap));
-		error = linux_get_error(task, error);
-		up_write(&vmap->vm_mm->mmap_sem);
-	}
-
-	if (error != 0) {
-		linux_cdev_handle_free(vmap);
-		return (error);
-	}
-
-	attr = pgprot2cachemode(vmap->vm_page_prot);
-
-	if (vmap->vm_ops != NULL) {
-		struct vm_area_struct *ptr;
-		void *vm_private_data;
-		bool vm_no_fault;
-
-		if (vmap->vm_ops->open == NULL ||
-		    vmap->vm_ops->close == NULL ||
-		    vmap->vm_private_data == NULL) {
-			/* free allocated VM area struct */
-			linux_cdev_handle_free(vmap);
-			return (EINVAL);
-		}
-
-		vm_private_data = vmap->vm_private_data;
-
-		rw_wlock(&linux_vma_lock);
-		TAILQ_FOREACH(ptr, &linux_vma_head, vm_entry) {
-			if (ptr->vm_private_data == vm_private_data)
-				break;
-		}
-		/* check if there is an existing VM area struct */
-		if (ptr != NULL) {
-			/* check if the VM area structure is invalid */
-			if (ptr->vm_ops == NULL ||
-			    ptr->vm_ops->open == NULL ||
-			    ptr->vm_ops->close == NULL) {
-				error = ESTALE;
-				vm_no_fault = 1;
-			} else {
-				error = EEXIST;
-				vm_no_fault = (ptr->vm_ops->fault == NULL);
-			}
-		} else {
-			/* insert VM area structure into list */
-			TAILQ_INSERT_TAIL(&linux_vma_head, vmap, vm_entry);
-			error = 0;
-			vm_no_fault = (vmap->vm_ops->fault == NULL);
-		}
-		rw_wunlock(&linux_vma_lock);
-
-		if (error != 0) {
-			/* free allocated VM area struct */
-			linux_cdev_handle_free(vmap);
-			/* check for stale VM area struct */
-			if (error != EEXIST)
-				return (error);
-		}
-
-		/* check if there is no fault handler */
-		if (vm_no_fault) {
-			*object = cdev_pager_allocate(vm_private_data, OBJT_DEVICE,
-			    &linux_cdev_pager_ops[1], size, nprot, *offset,
-			    td->td_ucred);
-		} else {
-			*object = cdev_pager_allocate(vm_private_data, OBJT_MGTDEVICE,
-			    &linux_cdev_pager_ops[0], size, nprot, *offset,
-			    td->td_ucred);
-		}
-
-		/* check if allocating the VM object failed */
-		if (*object == NULL) {
-			if (error == 0) {
-				/* remove VM area struct from list */
-				linux_cdev_handle_remove(vmap);
-				/* free allocated VM area struct */
-				linux_cdev_handle_free(vmap);
-			}
-			return (EINVAL);
-		}
-	} else {
-		struct sglist *sg;
-
-		sg = sglist_alloc(1, M_WAITOK);
-		sglist_append_phys(sg,
-		    (vm_paddr_t)vmap->vm_pfn << PAGE_SHIFT, vmap->vm_len);
-
-		*object = vm_pager_allocate(OBJT_SG, sg, vmap->vm_len,
-		    nprot, 0, td->td_ucred);
-
-		linux_cdev_handle_free(vmap);
-
-		if (*object == NULL) {
-			sglist_free(sg);
-			return (EINVAL);
-		}
-	}
-
-	if (attr != VM_MEMATTR_DEFAULT) {
-		VM_OBJECT_WLOCK(*object);
-		vm_object_set_memattr(*object, attr);
-		VM_OBJECT_WUNLOCK(*object);
-	}
-	*offset = 0;
-	return (0);
-}
-
-struct cdevsw linuxcdevsw = {
-	.d_version = D_VERSION,
-	.d_fdopen = linux_dev_fdopen,
-	.d_name = "lkpidev",
-};
-
-static int
-linux_file_read(struct file *file, struct uio *uio, struct ucred *active_cred,
-    int flags, struct thread *td)
-{
-	struct linux_file *filp;
-	const struct file_operations *fop;
-	struct linux_cdev *ldev;
-	ssize_t bytes;
-	int error;
-
-	error = 0;
-	filp = (struct linux_file *)file->f_data;
-	filp->f_flags = file->f_flag;
-	/* XXX no support for I/O vectors currently */
-	if (uio->uio_iovcnt != 1)
-		return (EOPNOTSUPP);
-	if (uio->uio_resid > DEVFS_IOSIZE_MAX)
-		return (EINVAL);
-	linux_set_current(td);
-	linux_get_fop(filp, &fop, &ldev);
-	if (fop->read != NULL) {
-		bytes = OPW(file, td, fop->read(filp,
-		    uio->uio_iov->iov_base,
-		    uio->uio_iov->iov_len, &uio->uio_offset));
-		if (bytes >= 0) {
-			uio->uio_iov->iov_base =
-			    ((uint8_t *)uio->uio_iov->iov_base) + bytes;
-			uio->uio_iov->iov_len -= bytes;
-			uio->uio_resid -= bytes;
-		} else {
-			error = linux_get_error(current, -bytes);
-		}
-	} else
-		error = ENXIO;
-
-	/* update kqfilter status, if any */
-	linux_file_kqfilter_poll(filp, LINUX_KQ_FLAG_HAS_READ);
-	linux_drop_fop(ldev);
-
-	return (error);
-}
-
-static int
-linux_file_write(struct file *file, struct uio *uio, struct ucred *active_cred,
-    int flags, struct thread *td)
-{
-	struct linux_file *filp;
-	const struct file_operations *fop;
-	struct linux_cdev *ldev;
-	ssize_t bytes;
-	int error;
-
-	filp = (struct linux_file *)file->f_data;
-	filp->f_flags = file->f_flag;
-	/* XXX no support for I/O vectors currently */
-	if (uio->uio_iovcnt != 1)
-		return (EOPNOTSUPP);
-	if (uio->uio_resid > DEVFS_IOSIZE_MAX)
-		return (EINVAL);
-	linux_set_current(td);
-	linux_get_fop(filp, &fop, &ldev);
-	if (fop->write != NULL) {
-		bytes = OPW(file, td, fop->write(filp,
-		    uio->uio_iov->iov_base,
-		    uio->uio_iov->iov_len, &uio->uio_offset));
-		if (bytes >= 0) {
-			uio->uio_iov->iov_base =
-			    ((uint8_t *)uio->uio_iov->iov_base) + bytes;
-			uio->uio_iov->iov_len -= bytes;
-			uio->uio_resid -= bytes;
-			error = 0;
-		} else {
-			error = linux_get_error(current, -bytes);
-		}
-	} else
-		error = ENXIO;
-
-	/* update kqfilter status, if any */
-	linux_file_kqfilter_poll(filp, LINUX_KQ_FLAG_HAS_WRITE);
-
-	linux_drop_fop(ldev);
-
-	return (error);
-}
-
-static int
-linux_file_poll(struct file *file, int events, struct ucred *active_cred,
-    struct thread *td)
-{
-	struct linux_file *filp;
-	const struct file_operations *fop;
-	struct linux_cdev *ldev;
-	int revents;
-
-	filp = (struct linux_file *)file->f_data;
-	filp->f_flags = file->f_flag;
-	linux_set_current(td);
-	linux_get_fop(filp, &fop, &ldev);
-	if (fop->poll != NULL) {
-		revents = OPW(file, td, fop->poll(filp,
-		    LINUX_POLL_TABLE_NORMAL)) & events;
-	} else {
-		revents = 0;
-	}
-	linux_drop_fop(ldev);
-	return (revents);
-}
-
-static int
-linux_file_close(struct file *file, struct thread *td)
-{
-	struct linux_file *filp;
-	int (*release)(struct inode *, struct linux_file *);
-	const struct file_operations *fop;
-	struct linux_cdev *ldev;
-	int error;
-
-	filp = (struct linux_file *)file->f_data;
-
-	KASSERT(file_count(filp) == 0,
-	    ("File refcount(%d) is not zero", file_count(filp)));
-
-	if (td == NULL)
-		td = curthread;
-
-	error = 0;
-	filp->f_flags = file->f_flag;
-	linux_set_current(td);
-	linux_poll_wait_dequeue(filp);
-	linux_get_fop(filp, &fop, &ldev);
-	/*
-	 * Always use the real release function, if any, to avoid
-	 * leaking device resources:
-	 */
-	release = filp->f_op->release;
-	if (release != NULL)
-		error = -OPW(file, td, release(filp->f_vnode, filp));
-	funsetown(&filp->f_sigio);
-	if (filp->f_vnode != NULL)
-		vdrop(filp->f_vnode);
-	linux_drop_fop(ldev);
-	ldev = filp->f_cdev;
-	if (ldev != NULL)
-		linux_cdev_deref(ldev);
-	kfree(filp);
-
-	return (error);
-}
-
-static int
-linux_file_ioctl(struct file *fp, u_long cmd, void *data, struct ucred *cred,
-    struct thread *td)
-{
-	struct linux_file *filp;
-	const struct file_operations *fop;
-	struct linux_cdev *ldev;
-	struct fiodgname_arg *fgn;
-	const char *p;
-	int error, i;
-
-	error = 0;
-	filp = (struct linux_file *)fp->f_data;
-	filp->f_flags = fp->f_flag;
-	linux_get_fop(filp, &fop, &ldev);
-
-	linux_set_current(td);
-	switch (cmd) {
-	case FIONBIO:
-		break;
-	case FIOASYNC:
-		if (fop->fasync == NULL)
-			break;
-		error = -OPW(fp, td, fop->fasync(0, filp, fp->f_flag & FASYNC));
-		break;
-	case FIOSETOWN:
-		error = fsetown(*(int *)data, &filp->f_sigio);
-		if (error == 0) {
-			if (fop->fasync == NULL)
-				break;
-			error = -OPW(fp, td, fop->fasync(0, filp,
-			    fp->f_flag & FASYNC));
-		}
-		break;
-	case FIOGETOWN:
-		*(int *)data = fgetown(&filp->f_sigio);
-		break;
-	case FIODGNAME:
-#ifdef	COMPAT_FREEBSD32
-	case FIODGNAME_32:
-#endif
-		if (filp->f_cdev == NULL || filp->f_cdev->cdev == NULL) {
-			error = ENXIO;
-			break;
-		}
-		fgn = data;
-		p = devtoname(filp->f_cdev->cdev);
-		i = strlen(p) + 1;
-		if (i > fgn->len) {
-			error = EINVAL;
-			break;
-		}
-		error = copyout(p, fiodgname_buf_get_ptr(fgn, cmd), i);
-		break;
-	default:
-		error = linux_file_ioctl_sub(fp, filp, fop, cmd, data, td);
-		break;
-	}
-	linux_drop_fop(ldev);
-	return (error);
-}
-
-static int
-linux_file_mmap_sub(struct thread *td, vm_size_t objsize, vm_prot_t prot,
-    vm_prot_t *maxprotp, int *flagsp, struct file *fp,
-    vm_ooffset_t *foff, const struct file_operations *fop, vm_object_t *objp)
-{
-	/*
-	 * Character devices do not provide private mappings
-	 * of any kind:
-	 */
-	if ((*maxprotp & VM_PROT_WRITE) == 0 &&
-	    (prot & VM_PROT_WRITE) != 0)
-		return (EACCES);
-	if ((*flagsp & (MAP_PRIVATE | MAP_COPY)) != 0)
-		return (EINVAL);
-
-	return (linux_file_mmap_single(fp, fop, foff, objsize, objp,
-	    (int)prot, td));
-}
-
-static int
-linux_file_mmap(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size,
-    vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff,
-    struct thread *td)
-{
-	struct linux_file *filp;
-	const struct file_operations *fop;
-	struct linux_cdev *ldev;
-	struct mount *mp;
-	struct vnode *vp;
-	vm_object_t object;
-	vm_prot_t maxprot;
-	int error;
-
-	filp = (struct linux_file *)fp->f_data;
-
-	vp = filp->f_vnode;
-	if (vp == NULL)
-		return (EOPNOTSUPP);
-
-	/*
-	 * Ensure that file and memory protections are
-	 * compatible.
-	 */
-	mp = vp->v_mount;
-	if (mp != NULL && (mp->mnt_flag & MNT_NOEXEC) != 0) {
-		maxprot = VM_PROT_NONE;
-		if ((prot & VM_PROT_EXECUTE) != 0)
-			return (EACCES);
-	} else
-		maxprot = VM_PROT_EXECUTE;
-	if ((fp->f_flag & FREAD) != 0)
-		maxprot |= VM_PROT_READ;
-	else if ((prot & VM_PROT_READ) != 0)
-		return (EACCES);
-
-	/*
-	 * If we are sharing potential changes via MAP_SHARED and we
-	 * are trying to get write permission although we opened it
-	 * without asking for it, bail out.
-	 *
-	 * Note that most character devices always share mappings.
-	 *
-	 * Rely on linux_file_mmap_sub() to fail invalid MAP_PRIVATE
-	 * requests rather than doing it here.
-	 */
-	if ((flags & MAP_SHARED) != 0) {
-		if ((fp->f_flag & FWRITE) != 0)
-			maxprot |= VM_PROT_WRITE;
-		else if ((prot & VM_PROT_WRITE) != 0)
-			return (EACCES);
-	}
-	maxprot &= cap_maxprot;
-
-	linux_get_fop(filp, &fop, &ldev);
-	error = linux_file_mmap_sub(td, size, prot, &maxprot, &flags, fp,
-	    &foff, fop, &object);
-	if (error != 0)
-		goto out;
-
-	error = vm_mmap_object(map, addr, size, prot, maxprot, flags, object,
-	    foff, FALSE, td);
-	if (error != 0)
-		vm_object_deallocate(object);
-out:
-	linux_drop_fop(ldev);
-	return (error);
-}
-
-static int
-linux_file_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
-    struct thread *td)
-{
-	struct linux_file *filp;
-	struct vnode *vp;
-	int error;
-
-	filp = (struct linux_file *)fp->f_data;
-	if (filp->f_vnode == NULL)
-		return (EOPNOTSUPP);
-
-	vp = filp->f_vnode;
-
-	vn_lock(vp, LK_SHARED | LK_RETRY);
-	error = VOP_STAT(vp, sb, td->td_ucred, NOCRED, td);
-	VOP_UNLOCK(vp);
-
-	return (error);
-}
-
-static int
-linux_file_fill_kinfo(struct file *fp, struct kinfo_file *kif,
-    struct filedesc *fdp)
-{
-	struct linux_file *filp;
-	struct vnode *vp;
-	int error;
-
-	filp = fp->f_data;
-	vp = filp->f_vnode;
-	if (vp == NULL) {
-		error = 0;
-		kif->kf_type = KF_TYPE_DEV;
-	} else {
-		vref(vp);
-		FILEDESC_SUNLOCK(fdp);
-		error = vn_fill_kinfo_vnode(vp, kif);
-		vrele(vp);
-		kif->kf_type = KF_TYPE_VNODE;
-		FILEDESC_SLOCK(fdp);
-	}
-	return (error);
-}
-
-unsigned int
-linux_iminor(struct inode *inode)
-{
-	struct linux_cdev *ldev;
-
-	if (inode == NULL || inode->v_rdev == NULL ||
-	    inode->v_rdev->si_devsw != &linuxcdevsw)
-		return (-1U);
-	ldev = inode->v_rdev->si_drv1;
-	if (ldev == NULL)
-		return (-1U);
-
-	return (minor(ldev->dev));
-}
-
-struct fileops linuxfileops = {
-	.fo_read = linux_file_read,
-	.fo_write = linux_file_write,
-	.fo_truncate = invfo_truncate,
-	.fo_kqfilter = linux_file_kqfilter,
-	.fo_stat = linux_file_stat,
-	.fo_fill_kinfo = linux_file_fill_kinfo,
-	.fo_poll = linux_file_poll,
-	.fo_close = linux_file_close,
-	.fo_ioctl = linux_file_ioctl,
-	.fo_mmap = linux_file_mmap,
-	.fo_chmod = invfo_chmod,
-	.fo_chown = invfo_chown,
-	.fo_sendfile = invfo_sendfile,
-	.fo_flags = DFLAG_PASSABLE,
-};
-
-/*
- * Hash of vmmap addresses.  This is infrequently accessed and does not
- * need to be particularly large.  This is done because we must store the
- * caller's idea of the map size to properly unmap.
- */
-struct vmmap {
-	LIST_ENTRY(vmmap)	vm_next;
-	void 			*vm_addr;
-	unsigned long		vm_size;
-};
-
-struct vmmaphd {
-	struct vmmap *lh_first;
-};
-#define	VMMAP_HASH_SIZE	64
-#define	VMMAP_HASH_MASK	(VMMAP_HASH_SIZE - 1)
-#define	VM_HASH(addr)	((uintptr_t)(addr) >> PAGE_SHIFT) & VMMAP_HASH_MASK
-static struct vmmaphd vmmaphead[VMMAP_HASH_SIZE];
-static struct mtx vmmaplock;
-
-static void
-vmmap_add(void *addr, unsigned long size)
-{
-	struct vmmap *vmmap;
-
-	vmmap = kmalloc(sizeof(*vmmap), GFP_KERNEL);
-	mtx_lock(&vmmaplock);
-	vmmap->vm_size = size;
-	vmmap->vm_addr = addr;
-	LIST_INSERT_HEAD(&vmmaphead[VM_HASH(addr)], vmmap, vm_next);
-	mtx_unlock(&vmmaplock);
-}
-
-static struct vmmap *
-vmmap_remove(void *addr)
-{
-	struct vmmap *vmmap;
-
-	mtx_lock(&vmmaplock);
-	LIST_FOREACH(vmmap, &vmmaphead[VM_HASH(addr)], vm_next)
-		if (vmmap->vm_addr == addr)
-			break;
-	if (vmmap)
-		LIST_REMOVE(vmmap, vm_next);
-	mtx_unlock(&vmmaplock);
-
-	return (vmmap);
-}
-
-#if defined(__i386__) || defined(__amd64__) || defined(__powerpc__) || defined(__aarch64__)
-void *
-_ioremap_attr(vm_paddr_t phys_addr, unsigned long size, int attr)
-{
-	void *addr;
-
-	addr = pmap_mapdev_attr(phys_addr, size, attr);
-	if (addr == NULL)
-		return (NULL);
-	vmmap_add(addr, size);
-
-	return (addr);
-}
-#endif
-
-void
-iounmap(void *addr)
-{
-	struct vmmap *vmmap;
-
-	vmmap = vmmap_remove(addr);
-	if (vmmap == NULL)
-		return;
-#if defined(__i386__) || defined(__amd64__) || defined(__powerpc__) || defined(__aarch64__)
-	pmap_unmapdev((vm_offset_t)addr, vmmap->vm_size);
-#endif
-	kfree(vmmap);
-}
-
-void *
-vmap(struct page **pages, unsigned int count, unsigned long flags, int prot)
-{
-	vm_offset_t off;
-	size_t size;
-
-	size = count * PAGE_SIZE;
-	off = kva_alloc(size);
-	if (off == 0)
-		return (NULL);
-	vmmap_add((void *)off, size);
-	pmap_qenter(off, pages, count);
-
-	return ((void *)off);
-}
-
-void
-vunmap(void *addr)
-{
-	struct vmmap *vmmap;
-
-	vmmap = vmmap_remove(addr);
-	if (vmmap == NULL)
-		return;
-	pmap_qremove((vm_offset_t)addr, vmmap->vm_size / PAGE_SIZE);
-	kva_free((vm_offset_t)addr, vmmap->vm_size);
-	kfree(vmmap);
-}
-
-static char *
-devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt, va_list ap)
-{
-	unsigned int len;
-	char *p;
-	va_list aq;
-
-	va_copy(aq, ap);
-	len = vsnprintf(NULL, 0, fmt, aq);
-	va_end(aq);
-
-	if (dev != NULL)
-		p = devm_kmalloc(dev, len + 1, gfp);
-	else
-		p = kmalloc(len + 1, gfp);
-	if (p != NULL)
-		vsnprintf(p, len + 1, fmt, ap);
-
-	return (p);
-}
-
-char *
-kvasprintf(gfp_t gfp, const char *fmt, va_list ap)
-{
-
-	return (devm_kvasprintf(NULL, gfp, fmt, ap));
-}
-
-char *
-lkpi_devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...)
-{
-	va_list ap;
-	char *p;
-
-	va_start(ap, fmt);
-	p = devm_kvasprintf(dev, gfp, fmt, ap);
-	va_end(ap);
-
-	return (p);
-}
-
-char *
-kasprintf(gfp_t gfp, const char *fmt, ...)
-{
-	va_list ap;
-	char *p;
-
-	va_start(ap, fmt);
-	p = kvasprintf(gfp, fmt, ap);
-	va_end(ap);
-
-	return (p);
-}
-
-static void
-linux_timer_callback_wrapper(void *context)
-{
-	struct timer_list *timer;
-
-	timer = context;
-
-	if (linux_set_current_flags(curthread, M_NOWAIT)) {
-		/* try again later */
-		callout_reset(&timer->callout, 1,
-		    &linux_timer_callback_wrapper, timer);
-		return;
-	}
-
-	timer->function(timer->data);
-}
-
-int
-mod_timer(struct timer_list *timer, int expires)
-{
-	int ret;
-
-	timer->expires = expires;
-	ret = callout_reset(&timer->callout,
-	    linux_timer_jiffies_until(expires),
-	    &linux_timer_callback_wrapper, timer);
-
-	MPASS(ret == 0 || ret == 1);
-
-	return (ret == 1);
-}
-
-void
-add_timer(struct timer_list *timer)
-{
-
-	callout_reset(&timer->callout,
-	    linux_timer_jiffies_until(timer->expires),
-	    &linux_timer_callback_wrapper, timer);
-}
-
-void
-add_timer_on(struct timer_list *timer, int cpu)
-{
-
-	callout_reset_on(&timer->callout,
-	    linux_timer_jiffies_until(timer->expires),
-	    &linux_timer_callback_wrapper, timer, cpu);
-}
-
-int
-del_timer(struct timer_list *timer)
-{
-
-	if (callout_stop(&(timer)->callout) == -1)
-		return (0);
-	return (1);
-}
-
-int
-del_timer_sync(struct timer_list *timer)
-{
-
-	if (callout_drain(&(timer)->callout) == -1)
-		return (0);
-	return (1);
-}
-
-/* greatest common divisor, Euclid equation */
-static uint64_t
-lkpi_gcd_64(uint64_t a, uint64_t b)
-{
-	uint64_t an;
-	uint64_t bn;
-
-	while (b != 0) {
-		an = b;
-		bn = a % b;
-		a = an;
-		b = bn;
-	}
-	return (a);
-}
-
-uint64_t lkpi_nsec2hz_rem;
-uint64_t lkpi_nsec2hz_div = 1000000000ULL;
-uint64_t lkpi_nsec2hz_max;
-
-uint64_t lkpi_usec2hz_rem;
-uint64_t lkpi_usec2hz_div = 1000000ULL;
-uint64_t lkpi_usec2hz_max;
-
-uint64_t lkpi_msec2hz_rem;
-uint64_t lkpi_msec2hz_div = 1000ULL;
-uint64_t lkpi_msec2hz_max;
-
-static void
-linux_timer_init(void *arg)
-{
-	uint64_t gcd;
-
-	/*
-	 * Compute an internal HZ value which can divide 2**32 to
-	 * avoid timer rounding problems when the tick value wraps
-	 * around 2**32:
-	 */
-	linux_timer_hz_mask = 1;
-	while (linux_timer_hz_mask < (unsigned long)hz)
-		linux_timer_hz_mask *= 2;
-	linux_timer_hz_mask--;
-
-	/* compute some internal constants */
-
-	lkpi_nsec2hz_rem = hz;
-	lkpi_usec2hz_rem = hz;
-	lkpi_msec2hz_rem = hz;
-
-	gcd = lkpi_gcd_64(lkpi_nsec2hz_rem, lkpi_nsec2hz_div);
-	lkpi_nsec2hz_rem /= gcd;
-	lkpi_nsec2hz_div /= gcd;
-	lkpi_nsec2hz_max = -1ULL / lkpi_nsec2hz_rem;
-
-	gcd = lkpi_gcd_64(lkpi_usec2hz_rem, lkpi_usec2hz_div);
-	lkpi_usec2hz_rem /= gcd;
-	lkpi_usec2hz_div /= gcd;
-	lkpi_usec2hz_max = -1ULL / lkpi_usec2hz_rem;
-
-	gcd = lkpi_gcd_64(lkpi_msec2hz_rem, lkpi_msec2hz_div);
-	lkpi_msec2hz_rem /= gcd;
-	lkpi_msec2hz_div /= gcd;
-	lkpi_msec2hz_max = -1ULL / lkpi_msec2hz_rem;
-}
-SYSINIT(linux_timer, SI_SUB_DRIVERS, SI_ORDER_FIRST, linux_timer_init, NULL);
-
-void
-linux_complete_common(struct completion *c, int all)
-{
-	int wakeup_swapper;
-
-	sleepq_lock(c);
-	if (all) {
-		c->done = UINT_MAX;
-		wakeup_swapper = sleepq_broadcast(c, SLEEPQ_SLEEP, 0, 0);
-	} else {
-		if (c->done != UINT_MAX)
-			c->done++;
-		wakeup_swapper = sleepq_signal(c, SLEEPQ_SLEEP, 0, 0);
-	}
-	sleepq_release(c);
-	if (wakeup_swapper)
-		kick_proc0();
-}
-
-/*
- * Indefinite wait for done != 0 with or without signals.
- */
-int
-linux_wait_for_common(struct completion *c, int flags)
-{
-	struct task_struct *task;
-	int error;
-
-	if (SCHEDULER_STOPPED())
-		return (0);
-
-	task = current;
-
-	if (flags != 0)
-		flags = SLEEPQ_INTERRUPTIBLE | SLEEPQ_SLEEP;
-	else
-		flags = SLEEPQ_SLEEP;
-	error = 0;
-	for (;;) {
-		sleepq_lock(c);
-		if (c->done)
-			break;
-		sleepq_add(c, NULL, "completion", flags, 0);
-		if (flags & SLEEPQ_INTERRUPTIBLE) {
-			DROP_GIANT();
-			error = -sleepq_wait_sig(c, 0);
-			PICKUP_GIANT();
-			if (error != 0) {
-				linux_schedule_save_interrupt_value(task, error);
-				error = -ERESTARTSYS;
-				goto intr;
-			}
-		} else {
-			DROP_GIANT();
-			sleepq_wait(c, 0);
-			PICKUP_GIANT();
-		}
-	}
-	if (c->done != UINT_MAX)
-		c->done--;
-	sleepq_release(c);
-
-intr:
-	return (error);
-}
-
-/*
- * Time limited wait for done != 0 with or without signals.
- */
-int
-linux_wait_for_timeout_common(struct completion *c, int timeout, int flags)
-{
-	struct task_struct *task;
-	int end = jiffies + timeout;
-	int error;
-
-	if (SCHEDULER_STOPPED())
-		return (0);
-
-	task = current;
-
-	if (flags != 0)
-		flags = SLEEPQ_INTERRUPTIBLE | SLEEPQ_SLEEP;
-	else
-		flags = SLEEPQ_SLEEP;
-
-	for (;;) {
-		sleepq_lock(c);
-		if (c->done)
-			break;
-		sleepq_add(c, NULL, "completion", flags, 0);
-		sleepq_set_timeout(c, linux_timer_jiffies_until(end));
-
-		DROP_GIANT();
-		if (flags & SLEEPQ_INTERRUPTIBLE)
-			error = -sleepq_timedwait_sig(c, 0);
-		else
-			error = -sleepq_timedwait(c, 0);
-		PICKUP_GIANT();
-
-		if (error != 0) {
-			/* check for timeout */
-			if (error == -EWOULDBLOCK) {
-				error = 0;	/* timeout */
-			} else {
-				/* signal happened */
-				linux_schedule_save_interrupt_value(task, error);
-				error = -ERESTARTSYS;
-			}
-			goto done;
-		}
-	}
-	if (c->done != UINT_MAX)
-		c->done--;
-	sleepq_release(c);
-
-	/* return how many jiffies are left */
-	error = linux_timer_jiffies_until(end);
-done:
-	return (error);
-}
-
-int
-linux_try_wait_for_completion(struct completion *c)
-{
-	int isdone;
-
-	sleepq_lock(c);
-	isdone = (c->done != 0);
-	if (c->done != 0 && c->done != UINT_MAX)
-		c->done--;
-	sleepq_release(c);
-	return (isdone);
-}
-
-int
-linux_completion_done(struct completion *c)
-{
-	int isdone;
-
-	sleepq_lock(c);
-	isdone = (c->done != 0);
-	sleepq_release(c);
-	return (isdone);
-}
-
-static void
-linux_cdev_deref(struct linux_cdev *ldev)
-{
-	if (refcount_release(&ldev->refs) &&
-	    ldev->kobj.ktype == &linux_cdev_ktype)
-		kfree(ldev);
-}
-
-static void
-linux_cdev_release(struct kobject *kobj)
-{
-	struct linux_cdev *cdev;
-	struct kobject *parent;
-
-	cdev = container_of(kobj, struct linux_cdev, kobj);
-	parent = kobj->parent;
-	linux_destroy_dev(cdev);
-	linux_cdev_deref(cdev);
-	kobject_put(parent);
-}
-
-static void
-linux_cdev_static_release(struct kobject *kobj)
-{
-	struct cdev *cdev;
-	struct linux_cdev *ldev;
-	struct kobject *parent;
-
-	ldev = container_of(kobj, struct linux_cdev, kobj);
-	parent = kobj->parent;
-	cdev = ldev->cdev;
-	if (cdev != NULL) {
-		destroy_dev(cdev);
-		ldev->cdev = NULL;
-	}
-	kobject_put(parent);
-}
-
-void
-linux_destroy_dev(struct linux_cdev *ldev)
-{
-
-	if (ldev->cdev == NULL)
-		return;
-
-	MPASS((ldev->siref & LDEV_SI_DTR) == 0);
-	MPASS(ldev->kobj.ktype == &linux_cdev_ktype);
-
-	atomic_set_int(&ldev->siref, LDEV_SI_DTR);
-	while ((atomic_load_int(&ldev->siref) & ~LDEV_SI_DTR) != 0)
-		pause("ldevdtr", hz / 4);
-
-	destroy_dev(ldev->cdev);
-	ldev->cdev = NULL;
-}
-
-const struct kobj_type linux_cdev_ktype = {
-	.release = linux_cdev_release,
-};
-
-const struct kobj_type linux_cdev_static_ktype = {
-	.release = linux_cdev_static_release,
-};
-
-static void
-linux_handle_ifnet_link_event(void *arg, struct ifnet *ifp, int linkstate)
-{
-	struct notifier_block *nb;
-	struct netdev_notifier_info ni;
-
-	nb = arg;
-	ni.dev = (struct net_device *)ifp;
-	if (linkstate == LINK_STATE_UP)
-		nb->notifier_call(nb, NETDEV_UP, &ni);
-	else
-		nb->notifier_call(nb, NETDEV_DOWN, &ni);
-}
-
-static void
-linux_handle_ifnet_arrival_event(void *arg, struct ifnet *ifp)
-{
-	struct notifier_block *nb;
-	struct netdev_notifier_info ni;
-
-	nb = arg;
-	ni.dev = (struct net_device *)ifp;
-	nb->notifier_call(nb, NETDEV_REGISTER, &ni);
-}
-
-static void
-linux_handle_ifnet_departure_event(void *arg, struct ifnet *ifp)
-{
-	struct notifier_block *nb;
-	struct netdev_notifier_info ni;
-
-	nb = arg;
-	ni.dev = (struct net_device *)ifp;
-	nb->notifier_call(nb, NETDEV_UNREGISTER, &ni);
-}
-
-static void
-linux_handle_iflladdr_event(void *arg, struct ifnet *ifp)
-{
-	struct notifier_block *nb;
-	struct netdev_notifier_info ni;
-
-	nb = arg;
-	ni.dev = (struct net_device *)ifp;
-	nb->notifier_call(nb, NETDEV_CHANGEADDR, &ni);
-}
-
-static void
-linux_handle_ifaddr_event(void *arg, struct ifnet *ifp)
-{
-	struct notifier_block *nb;
-	struct netdev_notifier_info ni;
-
-	nb = arg;
-	ni.dev = (struct net_device *)ifp;
-	nb->notifier_call(nb, NETDEV_CHANGEIFADDR, &ni);
-}
-
-int
-register_netdevice_notifier(struct notifier_block *nb)
-{
-
-	nb->tags[NETDEV_UP] = EVENTHANDLER_REGISTER(
-	    ifnet_link_event, linux_handle_ifnet_link_event, nb, 0);
-	nb->tags[NETDEV_REGISTER] = EVENTHANDLER_REGISTER(
-	    ifnet_arrival_event, linux_handle_ifnet_arrival_event, nb, 0);
-	nb->tags[NETDEV_UNREGISTER] = EVENTHANDLER_REGISTER(
-	    ifnet_departure_event, linux_handle_ifnet_departure_event, nb, 0);
-	nb->tags[NETDEV_CHANGEADDR] = EVENTHANDLER_REGISTER(
-	    iflladdr_event, linux_handle_iflladdr_event, nb, 0);
-
-	return (0);
-}
-
-int
-register_inetaddr_notifier(struct notifier_block *nb)
-{
-
-	nb->tags[NETDEV_CHANGEIFADDR] = EVENTHANDLER_REGISTER(
-	    ifaddr_event, linux_handle_ifaddr_event, nb, 0);
-	return (0);
-}
-
-int
-unregister_netdevice_notifier(struct notifier_block *nb)
-{
-
-	EVENTHANDLER_DEREGISTER(ifnet_link_event,
-	    nb->tags[NETDEV_UP]);
-	EVENTHANDLER_DEREGISTER(ifnet_arrival_event,
-	    nb->tags[NETDEV_REGISTER]);
-	EVENTHANDLER_DEREGISTER(ifnet_departure_event,
-	    nb->tags[NETDEV_UNREGISTER]);
-	EVENTHANDLER_DEREGISTER(iflladdr_event,
-	    nb->tags[NETDEV_CHANGEADDR]);
-
-	return (0);
-}
-
-int
-unregister_inetaddr_notifier(struct notifier_block *nb)
-{
-
-	EVENTHANDLER_DEREGISTER(ifaddr_event,
-	    nb->tags[NETDEV_CHANGEIFADDR]);
-
-	return (0);
-}
-
-struct list_sort_thunk {
-	int (*cmp)(void *, struct list_head *, struct list_head *);
-	void *priv;
-};
-
-static inline int
-linux_le_cmp(void *priv, const void *d1, const void *d2)
-{
-	struct list_head *le1, *le2;
-	struct list_sort_thunk *thunk;
-
-	thunk = priv;
-	le1 = *(__DECONST(struct list_head **, d1));
-	le2 = *(__DECONST(struct list_head **, d2));
-	return ((thunk->cmp)(thunk->priv, le1, le2));
-}
-
-void
-list_sort(void *priv, struct list_head *head, int (*cmp)(void *priv,
-    struct list_head *a, struct list_head *b))
-{
-	struct list_sort_thunk thunk;
-	struct list_head **ar, *le;
-	size_t count, i;
-
-	count = 0;
-	list_for_each(le, head)
-		count++;
-	ar = malloc(sizeof(struct list_head *) * count, M_KMALLOC, M_WAITOK);
-	i = 0;
-	list_for_each(le, head)
-		ar[i++] = le;
-	thunk.cmp = cmp;
-	thunk.priv = priv;
-	qsort_r(ar, count, sizeof(struct list_head *), &thunk, linux_le_cmp);
-	INIT_LIST_HEAD(head);
-	for (i = 0; i < count; i++)
-		list_add_tail(ar[i], head);
-	free(ar, M_KMALLOC);
-}
-
-void
-linux_irq_handler(void *ent)
-{
-	struct irq_ent *irqe;
-
-	if (linux_set_current_flags(curthread, M_NOWAIT))
-		return;
-
-	irqe = ent;
-	irqe->handler(irqe->irq, irqe->arg);
-}
-
-#if defined(__i386__) || defined(__amd64__)
-int
-linux_wbinvd_on_all_cpus(void)
-{
-
-	pmap_invalidate_cache();
-	return (0);
-}
-#endif
-
-int
-linux_on_each_cpu(void callback(void *), void *data)
-{
-
-	smp_rendezvous(smp_no_rendezvous_barrier, callback,
-	    smp_no_rendezvous_barrier, data);
-	return (0);
-}
-
-int
-linux_in_atomic(void)
-{
-
-	return ((curthread->td_pflags & TDP_NOFAULTING) != 0);
-}
-
-struct linux_cdev *
-linux_find_cdev(const char *name, unsigned major, unsigned minor)
-{
-	dev_t dev = MKDEV(major, minor);
-	struct cdev *cdev;
-
-	dev_lock();
-	LIST_FOREACH(cdev, &linuxcdevsw.d_devs, si_list) {
-		struct linux_cdev *ldev = cdev->si_drv1;
-		if (ldev->dev == dev &&
-		    strcmp(kobject_name(&ldev->kobj), name) == 0) {
-			break;
-		}
-	}
-	dev_unlock();
-
-	return (cdev != NULL ? cdev->si_drv1 : NULL);
-}
-
-int
-__register_chrdev(unsigned int major, unsigned int baseminor,
-    unsigned int count, const char *name,
-    const struct file_operations *fops)
-{
-	struct linux_cdev *cdev;
-	int ret = 0;
-	int i;
-
-	for (i = baseminor; i < baseminor + count; i++) {
-		cdev = cdev_alloc();
-		cdev->ops = fops;
-		kobject_set_name(&cdev->kobj, name);
-
-		ret = cdev_add(cdev, makedev(major, i), 1);
-		if (ret != 0)
-			break;
-	}
-	return (ret);
-}
-
-int
-__register_chrdev_p(unsigned int major, unsigned int baseminor,
-    unsigned int count, const char *name,
-    const struct file_operations *fops, uid_t uid,
-    gid_t gid, int mode)
-{
-	struct linux_cdev *cdev;
-	int ret = 0;
-	int i;
-
-	for (i = baseminor; i < baseminor + count; i++) {
-		cdev = cdev_alloc();
-		cdev->ops = fops;
-		kobject_set_name(&cdev->kobj, name);
-
-		ret = cdev_add_ext(cdev, makedev(major, i), uid, gid, mode);
-		if (ret != 0)
-			break;
-	}
-	return (ret);
-}
-
-void
-__unregister_chrdev(unsigned int major, unsigned int baseminor,
-    unsigned int count, const char *name)
-{
-	struct linux_cdev *cdevp;
-	int i;
-
-	for (i = baseminor; i < baseminor + count; i++) {
-		cdevp = linux_find_cdev(name, major, i);
-		if (cdevp != NULL)
-			cdev_del(cdevp);
-	}
-}
-
-void
-linux_dump_stack(void)
-{
-#ifdef STACK
-	struct stack st;
-
-	stack_zero(&st);
-	stack_save(&st);
-	stack_print(&st);
-#endif
-}
-
-int
-linuxkpi_net_ratelimit(void)
-{
-
-	return (ppsratecheck(&lkpi_net_lastlog, &lkpi_net_curpps,
-	   lkpi_net_maxpps));
-}
-
-#if defined(__i386__) || defined(__amd64__)
-bool linux_cpu_has_clflush;
-#endif
-
-static void
-linux_compat_init(void *arg)
-{
-	struct sysctl_oid *rootoid;
-	int i;
-
-#if defined(__i386__) || defined(__amd64__)
-	linux_cpu_has_clflush = (cpu_feature & CPUID_CLFSH);
-#endif
-	rw_init(&linux_vma_lock, "lkpi-vma-lock");
-
-	rootoid = SYSCTL_ADD_ROOT_NODE(NULL,
-	    OID_AUTO, "sys", CTLFLAG_RD|CTLFLAG_MPSAFE, NULL, "sys");
-	kobject_init(&linux_class_root, &linux_class_ktype);
-	kobject_set_name(&linux_class_root, "class");
-	linux_class_root.oidp = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(rootoid),
-	    OID_AUTO, "class", CTLFLAG_RD|CTLFLAG_MPSAFE, NULL, "class");
-	kobject_init(&linux_root_device.kobj, &linux_dev_ktype);
-	kobject_set_name(&linux_root_device.kobj, "device");
-	linux_root_device.kobj.oidp = SYSCTL_ADD_NODE(NULL,
-	    SYSCTL_CHILDREN(rootoid), OID_AUTO, "device",
-	    CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "device");
-	linux_root_device.bsddev = root_bus;
-	linux_class_misc.name = "misc";
-	class_register(&linux_class_misc);
-	INIT_LIST_HEAD(&pci_drivers);
-	INIT_LIST_HEAD(&pci_devices);
-	spin_lock_init(&pci_lock);
-	mtx_init(&vmmaplock, "IO Map lock", NULL, MTX_DEF);
-	for (i = 0; i < VMMAP_HASH_SIZE; i++)
-		LIST_INIT(&vmmaphead[i]);
-	init_waitqueue_head(&linux_bit_waitq);
-	init_waitqueue_head(&linux_var_waitq);
-}
-SYSINIT(linux_compat, SI_SUB_DRIVERS, SI_ORDER_SECOND, linux_compat_init, NULL);
-
-static void
-linux_compat_uninit(void *arg)
-{
-	linux_kobject_kfree_name(&linux_class_root);
-	linux_kobject_kfree_name(&linux_root_device.kobj);
-	linux_kobject_kfree_name(&linux_class_misc.kobj);
-
-	mtx_destroy(&vmmaplock);
-	spin_lock_destroy(&pci_lock);
-	rw_destroy(&linux_vma_lock);
-}
-SYSUNINIT(linux_compat, SI_SUB_DRIVERS, SI_ORDER_SECOND, linux_compat_uninit, NULL);
-
-/*
- * NOTE: Linux frequently uses "unsigned long" for pointer to integer
- * conversion and vice versa, where in FreeBSD "uintptr_t" would be
- * used. Assert these types have the same size, else some parts of the
- * LinuxKPI may not work like expected:
- */
-CTASSERT(sizeof(unsigned long) == sizeof(uintptr_t));