diff --git a/include/asm-x86/proto.h b/include/asm-x86/proto.h
index 8ed1ebf666bebdde9224955b18f7faa156b3f6c9..a47e526716f4862740325096c505ad6b0bfb2c52 100644
--- a/include/asm-x86/proto.h
+++ b/include/asm-x86/proto.h
@@ -51,11 +51,8 @@ extern void check_efer(void);
 extern unsigned long table_start, table_end;
 
 extern int exception_trace;
-extern unsigned cpu_khz;
-extern unsigned tsc_khz;
 
 extern int reboot_force;
-extern int notsc_setup(char *);
 
 extern int gsi_irq_sharing(int gsi);
 
diff --git a/include/asm-x86/tsc.h b/include/asm-x86/tsc.h
index 6baab30dc2c8be051e81286bcb9e0ce97d37d724..d7b1c4e7a1086e57f3f24b0aa1fd100deab78e64 100644
--- a/include/asm-x86/tsc.h
+++ b/include/asm-x86/tsc.h
@@ -73,8 +73,7 @@ int check_tsc_unstable(void);
 extern void check_tsc_sync_source(int cpu);
 extern void check_tsc_sync_target(void);
 
-#ifdef CONFIG_X86_64
 extern void tsc_calibrate(void);
-#endif
+extern int notsc_setup(char *);
 
 #endif