Index: /trunk/include/iprt/cdefs.h
===================================================================
--- /trunk/include/iprt/cdefs.h	(revision 81648)
+++ /trunk/include/iprt/cdefs.h	(revision 81649)
@@ -1159,5 +1159,5 @@
  * @sa RT_FALL_THRU  */
 #if RT_GNUC_PREREQ(7, 0)
-# define RT_FALL_THROUGH()      __attribute__((fallthrough))
+# define RT_FALL_THROUGH()      __attribute__((__fallthrough__))
 #else
 # define RT_FALL_THROUGH()      (void)0
Index: /trunk/src/VBox/Additions/linux/drm/vbox_drv.c
===================================================================
--- /trunk/src/VBox/Additions/linux/drm/vbox_drv.c	(revision 81648)
+++ /trunk/src/VBox/Additions/linux/drm/vbox_drv.c	(revision 81649)
@@ -306,10 +306,14 @@
 
 static struct drm_driver driver = {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 4, 0)
 	.driver_features =
 	    DRIVER_MODESET | DRIVER_GEM | DRIVER_HAVE_IRQ |
-#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 1, 0) && !defined(RHEL_81)
+# if LINUX_VERSION_CODE < KERNEL_VERSION(5, 1, 0) && !defined(RHEL_81)
 	    DRIVER_IRQ_SHARED |
-#endif
+# endif /* < KERNEL_VERSION(5, 1, 0) && !defined(RHEL_81) */
 	    DRIVER_PRIME,
+#else /* >= KERNEL_VERSION(5, 4, 0) */
+        .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_HAVE_IRQ,
+#endif /* < KERNEL_VERSION(5, 4, 0) */
 	.dev_priv_size = 0,
 
Index: /trunk/src/VBox/Additions/linux/drm/vbox_main.c
===================================================================
--- /trunk/src/VBox/Additions/linux/drm/vbox_main.c	(revision 81648)
+++ /trunk/src/VBox/Additions/linux/drm/vbox_main.c	(revision 81649)
@@ -622,9 +622,11 @@
 static inline u64 vbox_bo_mmap_offset(struct vbox_bo *bo)
 {
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 12, 0) && !defined(RHEL_70)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 4, 0)
+        return drm_vma_node_offset_addr(&bo->bo.base.vma_node);
+#elif LINUX_VERSION_CODE < KERNEL_VERSION(3, 12, 0) && !defined(RHEL_70)
 	return bo->bo.addr_space_offset;
 #else
 	return drm_vma_node_offset_addr(&bo->bo.vma_node);
-#endif
+#endif /* >= KERNEL_VERSION(5, 4, 0) */
 }
 
Index: /trunk/src/VBox/HostDrivers/VBoxNetFlt/linux/VBoxNetFlt-linux.c
===================================================================
--- /trunk/src/VBox/HostDrivers/VBoxNetFlt/linux/VBoxNetFlt-linux.c	(revision 81648)
+++ /trunk/src/VBox/HostDrivers/VBoxNetFlt/linux/VBoxNetFlt-linux.c	(revision 81649)
@@ -925,6 +925,11 @@
     {
         skb_frag_t *pFrag = &skb_shinfo(pBuf)->frags[i];
+# if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 4, 0)
+        pSG->aSegs[iSeg].cb = pFrag->bv_len;
+        pSG->aSegs[iSeg].pv = VBOX_SKB_KMAP_FRAG(pFrag) + pFrag->bv_offset;
+# else /* < KERNEL_VERSION(5, 4, 0) */
         pSG->aSegs[iSeg].cb = pFrag->size;
         pSG->aSegs[iSeg].pv = VBOX_SKB_KMAP_FRAG(pFrag) + pFrag->page_offset;
+# endif /* >= KERNEL_VERSION(5, 4, 0) */
         Log6((" %p", pSG->aSegs[iSeg].pv));
         pSG->aSegs[iSeg++].Phys = NIL_RTHCPHYS;
@@ -941,6 +946,11 @@
         {
             skb_frag_t *pFrag = &skb_shinfo(pFragBuf)->frags[i];
+# if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 4, 0)
+            pSG->aSegs[iSeg].cb = pFrag->bv_len;
+            pSG->aSegs[iSeg].pv = VBOX_SKB_KMAP_FRAG(pFrag) + pFrag->bv_offset;
+# else /* < KERNEL_VERSION(5, 4, 0) */
             pSG->aSegs[iSeg].cb = pFrag->size;
             pSG->aSegs[iSeg].pv = VBOX_SKB_KMAP_FRAG(pFrag) + pFrag->page_offset;
+# endif /* >= KERNEL_VERSION(5, 4, 0) */
             Log6((" %p", pSG->aSegs[iSeg].pv));
             pSG->aSegs[iSeg++].Phys = NIL_RTHCPHYS;
Index: /trunk/src/VBox/Runtime/common/fs/ntfsvfs.cpp
===================================================================
--- /trunk/src/VBox/Runtime/common/fs/ntfsvfs.cpp	(revision 81648)
+++ /trunk/src/VBox/Runtime/common/fs/ntfsvfs.cpp	(revision 81649)
@@ -1053,5 +1053,5 @@
                     case 3: cClustersInRun |= (uint32_t)pbPairs[offPairs + 2] << 16; RT_FALL_THRU();
                     case 2: cClustersInRun |= (uint16_t)pbPairs[offPairs + 1] <<  8; RT_FALL_THRU();
-                    case 1: cClustersInRun |= (uint16_t)pbPairs[offPairs + 0] <<  0; RT_FALL_THRU();
+                    case 1: cClustersInRun |= (uint16_t)pbPairs[offPairs + 0] <<  0;
                 }
                 offPairs += cbRunField;
Index: /trunk/src/VBox/Runtime/r0drv/linux/thread2-r0drv-linux.c
===================================================================
--- /trunk/src/VBox/Runtime/r0drv/linux/thread2-r0drv-linux.c	(revision 81648)
+++ /trunk/src/VBox/Runtime/r0drv/linux/thread2-r0drv-linux.c	(revision 81649)
@@ -37,4 +37,7 @@
 #include "internal/thread.h"
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
+    #include <uapi/linux/sched/types.h>
+#endif /* >= KERNEL_VERSION(4, 11, 0) */
 
 RTDECL(RTTHREAD) RTThreadSelf(void)