https://github.com/VirtualBox/virtualbox/commit/33992f0e56b8a9bb565e0beecad91e87362ab390

From 33992f0e56b8a9bb565e0beecad91e87362ab390 Mon Sep 17 00:00:00 2001
From: Vadim Galitsyn <vadim.galitsyn@oracle.com>
Date: Tue, 17 Feb 2026 15:37:37 +0000
Subject: [PATCH] Linux host: Introduce initial support for kernel 6.19 (build
 fix for old kernels),bugref:11038.

svn:sync-xref-src-repo-rev: r172811
--- a/vboxguest/r0drv/linux/memobj-r0drv-linux.c
+++ b/vboxguest/r0drv/linux/memobj-r0drv-linux.c
@@ -181,7 +181,6 @@ static const struct
 *   Internal Functions                                                                                                           *
 *********************************************************************************************************************************/
 static void rtR0MemObjLinuxFreePages(PRTR0MEMOBJLNX pMemLnx);
-static void rtR0MemObjLinuxFlushTlbAll(void);
 
 
 /**
@@ -2245,15 +2244,17 @@ DECLHIDDEN(int) rtR0MemObjNativeMapUser(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJ p
     return rc;
 }
 
+#if defined(IPRT_USE_ALLOC_VM_AREA_FOR_EXEC) || defined(IPRT_USE_APPLY_TO_PAGE_RANGE_FOR_EXEC)
 static void rtR0MemObjLinuxFlushTlbAll(void)
 {
-#if RTLNX_VER_MIN(6,19,0)
+# if RTLNX_VER_MIN(6,19,0)
     if (RT_LIKELY(RT_VALID_PTR(g_pfnLinuxFlushTlbAll)))
         g_pfnLinuxFlushTlbAll();
-#else
+# else
     __flush_tlb_all();
-#endif
+# endif
 }
+#endif
 
 DECLHIDDEN(int) rtR0MemObjNativeProtect(PRTR0MEMOBJINTERNAL pMem, size_t offSub, size_t cbSub, uint32_t fProt)
 {