diff --git a/include/asm-arm/ptrace.h b/include/asm-arm/ptrace.h
index 604e3a1..4377e22 100644
--- a/include/asm-arm/ptrace.h
+++ b/include/asm-arm/ptrace.h
@@ -142,11 +142,8 @@
 #endif
 
 #ifdef __KERNEL__
-extern void show_regs(struct pt_regs *);
-
-#define predicate(x)	(x & 0xf0000000)
+#define predicate(x)		((x) & 0xf0000000)
 #define PREDICATE_ALWAYS	0xe0000000
-
 #endif
 
 #endif /* __ASSEMBLY__ */
diff --git a/include/asm-arm/system.h b/include/asm-arm/system.h
index b573129..b13a8da 100644
--- a/include/asm-arm/system.h
+++ b/include/asm-arm/system.h
@@ -99,6 +99,9 @@
 #define tas(ptr) (xchg((ptr),1))
 
 extern asmlinkage void __backtrace(void);
+extern asmlinkage void c_backtrace(unsigned long fp, int pmode);
+extern void show_pte(struct mm_struct *mm, unsigned long addr);
+extern void __show_regs(struct pt_regs *);
 
 extern int cpu_architecture(void);