arch/x86/include/asm/runtime-const.h |  4 ++++
 arch/x86/include/asm/uaccess_64.h    | 10 +++++-----
 arch/x86/kernel/cpu/common.c         |  6 +++++-
 3 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/runtime-const.h b/arch/x86/include/asm/runtime-const.h
index 8d983cfd06ea..e5a13dc8816e 100644
--- a/arch/x86/include/asm/runtime-const.h
+++ b/arch/x86/include/asm/runtime-const.h
@@ -2,6 +2,10 @@
 #ifndef _ASM_RUNTIME_CONST_H
 #define _ASM_RUNTIME_CONST_H
 
+#ifdef MODULE
+  #error "Cannot use runtime-const infrastructure from modules"
+#endif
+
 #ifdef __ASSEMBLY__
 
 .macro RUNTIME_CONST_PTR sym reg
diff --git a/arch/x86/include/asm/uaccess_64.h b/arch/x86/include/asm/uaccess_64.h
index c8a5ae35c871..641f45c22f9d 100644
--- a/arch/x86/include/asm/uaccess_64.h
+++ b/arch/x86/include/asm/uaccess_64.h
@@ -12,12 +12,12 @@
 #include <asm/cpufeatures.h>
 #include <asm/page.h>
 #include <asm/percpu.h>
-#include <asm/runtime-const.h>
 
-/*
- * Virtual variable: there's no actual backing store for this,
- * it can purely be used as 'runtime_const_ptr(USER_PTR_MAX)'
- */
+#ifdef MODULE
+  #define runtime_const_ptr(sym) (sym)
+#else
+  #include <asm/runtime-const.h>
+#endif
 extern unsigned long USER_PTR_MAX;
 
 #ifdef CONFIG_ADDRESS_MASKING
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index c7d3512914ca..02d97834a1d4 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -78,6 +78,10 @@
 DEFINE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86, cpu_info);
 EXPORT_PER_CPU_SYMBOL(cpu_info);
 
+/* Used for modules: built-in code uses runtime constants */
+unsigned long USER_PTR_MAX;
+EXPORT_SYMBOL(USER_PTR_MAX);
+
 u32 elf_hwcap2 __read_mostly;
 
 /* Number of siblings per CPU package */
@@ -2579,7 +2583,7 @@ void __init arch_cpu_finalize_init(void)
 	alternative_instructions();
 
 	if (IS_ENABLED(CONFIG_X86_64)) {
-		unsigned long USER_PTR_MAX = TASK_SIZE_MAX;
+		USER_PTR_MAX = TASK_SIZE_MAX;
 
 		/*
 		 * Enable this when LAM is gated on LASS support