--- a/vmnet/Makefile
+++ b/vmnet/Makefile
@@ -43,7 +43,11 @@ INCLUDE      += -I$(SRCROOT)/shared
 endif
 
 
+ifdef KVERSION
+VM_UNAME = $(KVERSION)
+else
 VM_UNAME = $(shell uname -r)
+endif
 
 # Header directory for the running kernel
 ifdef LINUXINCLUDE
@@ -100,6 +104,13 @@ auto-build: $(DRIVER_KO)
 $(DRIVER): $(DRIVER_KO)
 	if [ $< -nt $@ ] || [ ! -e $@ ] ; then cp -f $< $@; fi
 
+# Use SUBDIRS on 2.x, 3.x, 4.x.  Use M on newer kernels.
+ifeq ($(filter-out 2 3 4,$(firstword $(subst ., ,$(VM_UNAME)))),)
+DIRVAR := SUBDIRS
+else
+DIRVAR := M
+endif
+
 # Pass gcc version down the chain, so we can detect if kernel attempts to use unapproved compiler
 VM_CCVER := $(VMCCVER)
 export VM_CCVER
@@ -117,7 +128,7 @@ prebuild:: ;
 postbuild:: ;
 
 $(DRIVER_KO): prebuild
-	$(MAKE) -C $(BUILD_DIR) SUBDIRS=$$PWD SRCROOT=$$PWD/$(SRCROOT) \
+	$(MAKE) -C $(BUILD_DIR) $(DIRVAR)=$$PWD SRCROOT=$$PWD/$(SRCROOT) \
 	  MODULEBUILDDIR=$(MODULEBUILDDIR) modules
 	$(MAKE) -C $$PWD SRCROOT=$$PWD/$(SRCROOT) \
 	  MODULEBUILDDIR=$(MODULEBUILDDIR) postbuild
--- a/vmnet/bridge.c
+++ b/vmnet/bridge.c
@@ -65,7 +65,7 @@
 #endif
 
 #if LOGLEVEL >= 4
-static struct timeval vnetTime;
+static u64 vnetTime;
 #endif
 
 typedef struct VNetBridge VNetBridge;
@@ -636,7 +636,7 @@ VNetBridgeReceiveFromVNet(VNetJack
 	 unsigned long flags;
 	 int i;
 
-	 atomic_inc(&clone->users);
+	 clone = skb_get(clone);
 
 	 clone->dev = dev;
 	 clone->protocol = eth_type_trans(clone, dev);
@@ -696,7 +696,7 @@ VNetBridgeReceiveFromVNet(VNetJack
 
 	 netif_rx_ni(clone);
 #	 if LOGLEVEL >= 4
-	 do_gettimeofday(&vnetTime);
+	 vnetTime = ktime_get_ns();
 #	 endif
       }
    }
@@ -1143,11 +1143,16 @@ VNetBridgeNotifyLogBridgeUpError(int err
 static int
 VNetBridgeNotify(struct notifier_block *this, // IN: callback data (bridge)
                  u_long msg,                  // IN: type of event
-                 void *data)                  // IN: device pertaining to event
+                 void *data)                  // IN: net_device or notifier info
 {
    VNetBridge *bridge = list_entry(this, VNetBridge, notifier);
-   struct net_device *dev = (struct net_device *) data;
+   struct net_device *dev;
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 11, 0)
+   dev = netdev_notifier_info_to_dev(data);
+#else
+   dev = (struct net_device *)data;
+#endif
    switch (msg) {
    case NETDEV_UNREGISTER:
       LOG(2, (KERN_DEBUG "bridge-%s: interface %s is unregistering\n",
@@ -1656,12 +1661,11 @@ VNetBridgeReceiveFromDev(struct sk_buff
 
 #  if LOGLEVEL >= 4
    {
-      struct timeval now;
-      do_gettimeofday(&now);
+      u64 now;
+
+      now = ktime_get_ns();
       LOG(3, (KERN_DEBUG "bridge-%s: time %d\n",
-	      bridge->name,
-	      (int)((now.tv_sec * 1000000 + now.tv_usec)
-                    - (vnetTime.tv_sec * 1000000 + vnetTime.tv_usec))));
+	      bridge->name, (int)((now - vnetTime) / NSEC_PER_USEC)));
    }
 #  endif
 
--- a/vmnet/compat_netdevice.h
+++ b/vmnet/compat_netdevice.h
@@ -337,4 +337,11 @@ typedef netdev_features_t compat_netdev_
 typedef u32 compat_netdev_features_t;
 #endif
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 7, 0) || \
+    (defined(RHEL_RELEASE_CODE) && RHEL_RELEASE_CODE >= 0x0704)
+#define compat_netif_trans_update(d) netif_trans_update(d)
+#else
+#define compat_netif_trans_update(d) do { (d)->trans_start = jiffies; } while (0)
+#endif
+
 #endif /* __COMPAT_NETDEVICE_H__ */
--- a/vmnet/netif.c
+++ b/vmnet/netif.c
@@ -149,7 +149,7 @@ VNetNetIf_Create(char *devName,  // IN:
    memcpy(deviceName, devName, sizeof deviceName);
    NULL_TERMINATE_STRING(deviceName);
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0) || defined(NET_NAME_USER)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0)
    dev = alloc_netdev(sizeof *netIf, deviceName, NET_NAME_USER, VNetNetIfSetup);
 #else
    dev = alloc_netdev(sizeof *netIf, deviceName, VNetNetIfSetup);
@@ -465,7 +465,7 @@ VNetNetifStartXmit(struct sk_buff    *sk
    VNetSend(&netIf->port.jack, skb);
 
    netIf->stats.tx_packets++;
-   dev->trans_start = jiffies;
+   compat_netif_trans_update(dev);
 
    return 0;
 }
--- a/vmnet/procfs.c
+++ a/vmnet/procfs.c
@@ -137,6 +137,7 @@ VNetProcShow(struct seq_file *p, // IN:
 }
 
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 18, 0)
 /*
  *----------------------------------------------------------------------
  *
@@ -168,6 +169,7 @@ static struct file_operations fops = {
    .release = single_release,
 };
 #endif
+#endif
 
 
 /*
@@ -203,7 +205,12 @@ VNetProcMakeEntryInt(VNetProcEntry   *pa
       } else {
          ent->data   = data;
          ent->fn     = fn;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 18, 0)
+         ent->pde    = proc_create_single_data(name, mode, parent->pde,
+                                               VNetProcShow, ent);
+#else
          ent->pde    = proc_create_data(name, mode, parent->pde, &fops, ent);
+#endif
       }
       if (ent->pde != NULL) {
          *ret = ent;
--- a/vmnet/userif.c
+++ b/vmnet/userif.c
@@ -36,6 +36,9 @@
 #include <linux/slab.h>
 #include <linux/version.h>
 #include <linux/wait.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
+#include <linux/taskstats_kern.h>  // For <linux/sched/signal.h> without version dependency
+#endif
 
 #include <net/checksum.h>
 #include <net/sock.h>
@@ -81,11 +84,11 @@ static int  VNetUserIfSetUplinkState(VNe
 extern unsigned int  vnet_max_qlen;
 
 #if COMPAT_LINUX_VERSION_CHECK_LT(3, 2, 0)
-#   define compat_kmap(page) kmap(page)
-#   define compat_kunmap(page) kunmap(page)
-#else
-#   define compat_kmap(page) kmap((page).p)
-#   define compat_kunmap(page) kunmap((page).p)
+#   define skb_frag_page(frag) (frag)->page
+#   define skb_frag_size(frag) (frag)->size
+#endif
+#if COMPAT_LINUX_VERSION_CHECK_LT(5, 4, 0)
+#   define skb_frag_off(frag) (frag)->page_offset
 #endif
 
 /*
@@ -112,10 +115,7 @@ UserifLockPage(VA addr) // IN
    struct page *page = NULL;
    int retval;
 
-   down_read(&current->mm->mmap_sem);
-   retval = get_user_pages(current, current->mm, addr,
-			   1, 1, 0, &page, NULL);
-   up_read(&current->mm->mmap_sem);
+   retval = get_user_pages_fast(addr, 1, FOLL_WRITE, &page);
 
    if (retval != 1) {
       return NULL;
@@ -143,16 +143,21 @@ UserifLockPage(VA addr) // IN
  */
 
 static INLINE int
-VNetUserIfMapPtr(VA uAddr,        // IN: pointer to user memory
+VNetUserIfMapPtr(VA64 uAddr,      // IN: pointer to user memory
                  size_t size,     // IN: size of data
                  struct page **p, // OUT: locked page
                  void **ptr)      // OUT: kernel mapped pointer
 {
-   if (!access_ok(VERIFY_WRITE, (void *)uAddr, size) ||
-       (((uAddr + size - 1) & ~(PAGE_SIZE - 1)) !=
-        (uAddr & ~(PAGE_SIZE - 1)))) {
+   uint8 v;
+
+   /* Check area does not straddle two pages. */
+   if ((uAddr & (PAGE_SIZE - 1)) + size > PAGE_SIZE) {
       return -EINVAL;
    }
+   /* Check if it is user's area.  UserifLockPage() checks writability. */
+   if (copy_from_user(&v, (void *)(unsigned long)uAddr, sizeof v) != 0) {
+      return -EFAULT;
+   }
 
    *p = UserifLockPage(uAddr);
    if (*p == NULL) {
@@ -164,7 +169,7 @@ VNetUserIfMapPtr(VA uAddr,        // IN:
 }
 
 static INLINE int
-VNetUserIfMapUint32Ptr(VA uAddr,        // IN: pointer to user memory
+VNetUserIfMapUint32Ptr(VA64 uAddr,      // IN: pointer to user memory
                        struct page **p, // OUT: locked page
                        uint32 **ptr)    // OUT: kernel mapped pointer
 {
@@ -209,7 +214,7 @@ VNetUserIfSetupNotify(VNetUserIF *userIf
       return -EBUSY;
    }
 
-   if ((retval = VNetUserIfMapUint32Ptr((VA)vn->pollPtr, &pollPage,
+   if ((retval = VNetUserIfMapUint32Ptr(vn->pollPtr, &pollPage,
                                         &pollPtr)) < 0) {
       return retval;
    }
@@ -227,7 +232,7 @@ VNetUserIfSetupNotify(VNetUserIF *userIf
       goto error_free;
    }
 
-   if ((retval = VNetUserIfMapUint32Ptr((VA)vn->recvClusterPtr,
+   if ((retval = VNetUserIfMapUint32Ptr(vn->recvClusterPtr,
                                         &recvClusterPage,
                                         &recvClusterCount)) < 0) {
       goto error_free;
@@ -576,7 +581,12 @@ VNetCsumCopyDatagram(const struct sk_buf
       return -EINVAL;
    }
 
+#if COMPAT_LINUX_VERSION_CHECK_LT(5, 10, 0)
    csum = csum_and_copy_to_user(skb->data + offset, curr, len, 0, &err);
+#else
+   csum = csum_and_copy_to_user(skb->data + offset, curr, len);
+   err = (csum == 0) ? -EFAULT : 0;
+#endif
    if (err) {
       return err;
    }
@@ -585,20 +595,26 @@ VNetCsumCopyDatagram(const struct sk_buf
    for (frag = skb_shinfo(skb)->frags;
 	frag != skb_shinfo(skb)->frags + skb_shinfo(skb)->nr_frags;
 	frag++) {
-      if (frag->size > 0) {
+      if (skb_frag_size(frag) > 0) {
 	 unsigned int tmpCsum;
 	 const void *vaddr;
 
-	 vaddr = compat_kmap(frag->page);
-	 tmpCsum = csum_and_copy_to_user(vaddr + frag->page_offset,
-					 curr, frag->size, 0, &err);
-	 compat_kunmap(frag->page);
+	 vaddr = kmap(skb_frag_page(frag));
+#if COMPAT_LINUX_VERSION_CHECK_LT(5, 10, 0)
+	 tmpCsum = csum_and_copy_to_user(vaddr + skb_frag_off(frag),
+					 curr, skb_frag_size(frag), 0, &err);
+#else
+	 tmpCsum = csum_and_copy_to_user(vaddr + skb_frag_off(frag),
+					 curr, skb_frag_size(frag));
+	 err = (tmpCsum == 0) ? -EFAULT : 0;
+#endif
+	 kunmap(skb_frag_page(frag));
 
 	 if (err) {
 	    return err;
 	 }
 	 csum = csum_block_add(csum, tmpCsum, curr - buf);
-	 curr += frag->size;
+	 curr += skb_frag_size(frag);
       }
    }
 
--- a/vmnet/vmnetInt.h
+++ b/vmnet/vmnetInt.h
@@ -77,7 +77,7 @@
 
 
 extern struct proto vmnet_proto;
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0) || defined(sk_net_refcnt)
 #   define compat_sk_alloc(_bri, _pri) sk_alloc(&init_net, \
                                                 PF_NETLINK, _pri, &vmnet_proto, 1)
 #elif defined(VMW_NETDEV_HAS_NET)