diff --git a/include/asm-x86/mmu.h b/include/asm-x86/mmu.h
index 00e88679e11f780af5654ae54f2bfafc7e572369..80a1dee5bea5ec67bb77adf6db286f471d8006e8 100644
--- a/include/asm-x86/mmu.h
+++ b/include/asm-x86/mmu.h
@@ -7,14 +7,9 @@
 /*
  * The x86 doesn't have a mmu context, but
  * we put the segment information here.
- *
- * cpu_vm_mask is used to optimize ldt flushing.
  */
 typedef struct {
 	void *ldt;
-#ifdef CONFIG_X86_64
-	rwlock_t ldtlock;
-#endif
 	int size;
 	struct mutex lock;
 	void *vdso;