Index: VirtualBox-5.2.6/src/VBox/Additions/common/VBoxGuest/VBoxGuest-linux.c
===================================================================
--- VirtualBox-5.2.6.orig/src/VBox/Additions/common/VBoxGuest/VBoxGuest-linux.c
+++ VirtualBox-5.2.6/src/VBox/Additions/common/VBoxGuest/VBoxGuest-linux.c
@@ -1058,7 +1058,11 @@ void VGDrvNativeISRMousePollEvent(PVBOXG
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
 
 /** log and dbg_log parameter setter. */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
+static int vgdrvLinuxParamLogGrpSet(const char *pszValue, const struct kernel_param *pParam)
+#else
 static int vgdrvLinuxParamLogGrpSet(const char *pszValue, struct kernel_param *pParam)
+#endif
 {
     if (g_fLoggerCreated)
     {
@@ -1073,7 +1077,11 @@ static int vgdrvLinuxParamLogGrpSet(cons
 }
 
 /** log and dbg_log parameter getter. */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
+static int vgdrvLinuxParamLogGrpGet(char *pszBuf, const struct kernel_param *pParam)
+#else
 static int vgdrvLinuxParamLogGrpGet(char *pszBuf, struct kernel_param *pParam)
+#endif
 {
     PRTLOGGER pLogger = pParam->name[0] == 'd' ? RTLogDefaultInstance() : RTLogRelGetDefaultInstance();
     *pszBuf = '\0';
@@ -1084,7 +1092,11 @@ static int vgdrvLinuxParamLogGrpGet(char
 
 
 /** log and dbg_log_flags parameter setter. */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
+static int vgdrvLinuxParamLogFlagsSet(const char *pszValue, const struct kernel_param *pParam)
+#else
 static int vgdrvLinuxParamLogFlagsSet(const char *pszValue, struct kernel_param *pParam)
+#endif
 {
     if (g_fLoggerCreated)
     {
@@ -1098,7 +1110,11 @@ static int vgdrvLinuxParamLogFlagsSet(co
 }
 
 /** log and dbg_log_flags parameter getter. */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
+static int vgdrvLinuxParamLogFlagsGet(char *pszBuf, const struct kernel_param *pParam)
+#else
 static int vgdrvLinuxParamLogFlagsGet(char *pszBuf, struct kernel_param *pParam)
+#endif
 {
     PRTLOGGER pLogger = pParam->name[0] == 'd' ? RTLogDefaultInstance() : RTLogRelGetDefaultInstance();
     *pszBuf = '\0';
@@ -1109,7 +1125,11 @@ static int vgdrvLinuxParamLogFlagsGet(ch
 
 
 /** log and dbg_log_dest parameter setter. */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
+static int vgdrvLinuxParamLogDstSet(const char *pszValue, const struct kernel_param *pParam)
+#else
 static int vgdrvLinuxParamLogDstSet(const char *pszValue, struct kernel_param *pParam)
+#endif
 {
     if (g_fLoggerCreated)
     {
@@ -1123,7 +1143,11 @@ static int vgdrvLinuxParamLogDstSet(cons
 }
 
 /** log and dbg_log_dest parameter getter. */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
+static int vgdrvLinuxParamLogDstGet(char *pszBuf, const struct kernel_param *pParam)
+#else
 static int vgdrvLinuxParamLogDstGet(char *pszBuf, struct kernel_param *pParam)
+#endif
 {
     PRTLOGGER pLogger = pParam->name[0] == 'd' ? RTLogDefaultInstance() : RTLogRelGetDefaultInstance();
     *pszBuf = '\0';
@@ -1134,7 +1158,11 @@ static int vgdrvLinuxParamLogDstGet(char
 
 
 /** r3_log_to_host parameter setter. */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
+static int vgdrvLinuxParamR3LogToHostSet(const char *pszValue, const struct kernel_param *pParam)
+#else
 static int vgdrvLinuxParamR3LogToHostSet(const char *pszValue, struct kernel_param *pParam)
+#endif
 {
     if (    pszValue == NULL
         || *pszValue == '\0'
@@ -1152,7 +1180,11 @@ static int vgdrvLinuxParamR3LogToHostSet
 }
 
 /** r3_log_to_host parameter getter. */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
+static int vgdrvLinuxParamR3LogToHostGet(char *pszBuf, const struct kernel_param *pParam)
+#else
 static int vgdrvLinuxParamR3LogToHostGet(char *pszBuf, struct kernel_param *pParam)
+#endif
 {
     strcpy(pszBuf, g_DevExt.fLoggingEnabled ? "enabled" : "disabled");
     return strlen(pszBuf);
Index: VirtualBox-5.2.6/src/VBox/Additions/linux/drm/vbox_mode.c
===================================================================
--- VirtualBox-5.2.6.orig/src/VBox/Additions/linux/drm/vbox_mode.c
+++ VirtualBox-5.2.6/src/VBox/Additions/linux/drm/vbox_mode.c
@@ -401,7 +401,11 @@ static struct drm_encoder *vbox_best_sin
 
 	/* pick the encoder ids */
 	if (enc_id)
-		return drm_encoder_find(connector->dev, enc_id);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
+        return drm_encoder_find(connector->dev, NULL, enc_id);
+#else
+        return drm_encoder_find(connector->dev, enc_id);
+#endif
 
 	return NULL;
 }