tracing: rename ftrace_printk() => trace_printk()

Impact: cleanup

Use a more generic name - this also allows the prototype to move
to kernel.h and be generally available to kernel developers who
want to do some quick tracing.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/Documentation/ftrace.txt b/Documentation/ftrace.txt
index 2041ee9..22614be 100644
--- a/Documentation/ftrace.txt
+++ b/Documentation/ftrace.txt
@@ -1466,11 +1466,11 @@
 
 
 You can put some comments on specific functions by using
-ftrace_printk() For example, if you want to put a comment inside
+trace_printk() For example, if you want to put a comment inside
 the __might_sleep() function, you just have to include
-<linux/ftrace.h> and call ftrace_printk() inside __might_sleep()
+<linux/ftrace.h> and call trace_printk() inside __might_sleep()
 
-ftrace_printk("I'm a comment!\n")
+trace_printk("I'm a comment!\n")
 
 will produce: