ftrace: nmi safe code clean ups

Impact: cleanup

This patch cleans up the NMI safe code for dynamic ftrace as suggested
by Andrew Morton.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h
index f2ed6b7..a234681 100644
--- a/arch/x86/include/asm/ftrace.h
+++ b/arch/x86/include/asm/ftrace.h
@@ -22,16 +22,16 @@
 extern void ftrace_nmi_enter(void);
 extern void ftrace_nmi_exit(void);
 #else
-#define ftrace_nmi_enter()	do { } while (0)
-#define ftrace_nmi_exit()	do { } while (0)
+static inline void ftrace_nmi_enter(void) { }
+static inline void ftrace_nmi_exit(void) { }
 #endif
-#endif
+#endif /* __ASSEMBLY__ */
 
 #else /* CONFIG_FUNCTION_TRACER */
 
 #ifndef __ASSEMBLY__
-#define ftrace_nmi_enter()	do { } while (0)
-#define ftrace_nmi_exit()	do { } while (0)
+static inline void ftrace_nmi_enter(void) { }
+static inline void ftrace_nmi_exit(void) { }
 #endif
 
 #endif /* CONFIG_FUNCTION_TRACER */