diff --git a/Documentation/kbuild/kbuild.rst b/Documentation/kbuild/kbuild.rst
index 08f575e6236c..1afb6424f310 100644
--- a/Documentation/kbuild/kbuild.rst
+++ b/Documentation/kbuild/kbuild.rst
@@ -32,6 +32,11 @@ Additional options to pass when preprocessing. The preprocessing options
 will be used in all cases where kbuild does preprocessing including
 building C files and assembler files.
 
+KCPPFLAGS_COMPAT
+----------------
+Additional options to pass to $(CC_COMPAT) when preprocessing C and assembler
+files.
+
 KAFLAGS
 -------
 Additional options to the assembler (for built-in and modules).
diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile
index 36c8f66cad25..93d05dbaa286 100644
--- a/arch/arm64/kernel/vdso32/Makefile
+++ b/arch/arm64/kernel/vdso32/Makefile
@@ -106,6 +106,10 @@ VDSO_LDFLAGS += -z max-page-size=4096 -z common-page-size=4096
 VDSO_LDFLAGS += -shared --hash-style=sysv --build-id=sha1
 VDSO_LDFLAGS += --orphan-handling=warn
 
+# Add user-supplied KCPPFLAGS_COMPAT as the last assignments
+VDSO_CFLAGS += $(KCPPFLAGS_COMPAT)
+VDSO_AFLAGS += $(KCPPFLAGS_COMPAT)
+
 
 # Borrow vdsomunge.c from the arm vDSO
 # We have to use a relative path because scripts/Makefile.host prefixes