diff -u 2.5/arch/i386/kernel/cpu/mtrr/mtrr.h build-2.5/arch/i386/kernel/cpu/mtrr/mtrr.h
--- 2.5/arch/i386/kernel/cpu/mtrr/mtrr.h	Tue Jun 25 20:27:47 2002
+++ build-2.5/arch/i386/kernel/cpu/mtrr/mtrr.h	Tue Jun 25 21:22:15 2002
@@ -88,8 +88,8 @@
 extern u32 size_or_mask, size_and_mask;
 extern struct mtrr_ops * mtrr_if;
 
-#define is_cpu(vnd)	(mtrr_if->vendor == X86_VENDOR_##vnd)
-#define use_intel()	(mtrr_if->use_intel_if == 1)
+#define is_cpu(vnd)	(mtrr_if && mtrr_if->vendor == X86_VENDOR_##vnd)
+#define use_intel()	(mtrr_if && mtrr_if->use_intel_if == 1)
 
 extern unsigned int num_var_ranges;