Index: /trunk/src/VBox/Additions/linux/sharedfolders/regops.c
===================================================================
--- /trunk/src/VBox/Additions/linux/sharedfolders/regops.c	(revision 80712)
+++ /trunk/src/VBox/Additions/linux/sharedfolders/regops.c	(revision 80713)
@@ -80,9 +80,4 @@
 #endif
 
-#ifdef RHEL_RELEASE_CODE
-# if RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(8, 1)
-#  define RHEL_81
-# endif
-#endif
 
 /*********************************************************************************************************************************
Index: /trunk/src/VBox/Runtime/r0drv/linux/memuserkernel-r0drv-linux.c
===================================================================
--- /trunk/src/VBox/Runtime/r0drv/linux/memuserkernel-r0drv-linux.c	(revision 80712)
+++ /trunk/src/VBox/Runtime/r0drv/linux/memuserkernel-r0drv-linux.c	(revision 80713)
@@ -35,9 +35,4 @@
 #include <iprt/errcore.h>
 
-#ifdef RHEL_RELEASE_CODE
-# if RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(8, 1)
-#  define RHEL_81
-# endif
-#endif
 
 RTR0DECL(int) RTR0MemUserCopyFrom(void *pvDst, RTR3PTR R3PtrSrc, size_t cb)
Index: /trunk/src/VBox/Runtime/r0drv/linux/the-linux-kernel.h
===================================================================
--- /trunk/src/VBox/Runtime/r0drv/linux/the-linux-kernel.h	(revision 80712)
+++ /trunk/src/VBox/Runtime/r0drv/linux/the-linux-kernel.h	(revision 80713)
@@ -466,4 +466,12 @@
 RTDECL(struct page *) rtR0MemObjLinuxVirtToPage(void *pv);
 
+/*
+ * Guest Additions changes specific to Red Hat 8.1 and later.
+ */
+#ifdef RHEL_RELEASE_CODE
+# if RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(8, 1)
+#  define RHEL_81
+# endif
+#endif
 
 #endif /* !IPRT_INCLUDED_SRC_r0drv_linux_the_linux_kernel_h */