--- a/src/VBox/Runtime/r0drv/linux/mp-r0drv-linux.c.ORIG	2019-09-03 11:44:20.000000000 +0200
+++ b/src/VBox/Runtime/r0drv/linux/mp-r0drv-linux.c	2019-09-17 13:29:19.953980946 +0200
@@ -283,12 +283,16 @@
     if (RTCpuSetCount(&OnlineSet) > 1)
     {
         /* Fire the function on all other CPUs without waiting for completion. */
-# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 3, 0)
+       smp_call_function(rtmpLinuxAllWrapper, &Args, 0 /* wait */);
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
         int rc = smp_call_function(rtmpLinuxAllWrapper, &Args, 0 /* wait */);
-# else
+#else
         int rc = smp_call_function(rtmpLinuxAllWrapper, &Args, 0 /* retry */, 0 /* wait */);
-# endif
+#endif
+# if LINUX_VERSION_CODE < KERNEL_VERSION(5, 3, 0)
         Assert(!rc); NOREF(rc);
+#endif
     }
 #endif
 
@@ -326,7 +330,9 @@
 {
 #ifdef CONFIG_SMP
     IPRT_LINUX_SAVE_EFL_AC();
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 3, 0)
     int rc;
+#endif
     RTMPARGS Args;
 
     RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER;
@@ -337,14 +343,18 @@
     Args.cHits = 0;
 
     RTThreadPreemptDisable(&PreemptState);
-# if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 3, 0)
+    smp_call_function(rtmpLinuxWrapper, &Args, 1 /* wait */);
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
     rc = smp_call_function(rtmpLinuxWrapper, &Args, 1 /* wait */);
-# else /* older kernels */
+#else /* older kernels */
     rc = smp_call_function(rtmpLinuxWrapper, &Args, 0 /* retry */, 1 /* wait */);
-# endif /* older kernels */
+#endif /* older kernels */
     RTThreadPreemptRestore(&PreemptState);
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 3, 0)
     Assert(rc == 0); NOREF(rc);
+#endif
     IPRT_LINUX_RESTORE_EFL_AC();
 #else
     RT_NOREF(pfnWorker, pvUser1, pvUser2);