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>

Documentation/ftrace.txt

@@ -1466,11 +1466,11 @@ want, depending on your needs.
 
 
 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:
 

include/linux/ftrace.h

@@ -329,11 +329,11 @@ extern void
 ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
 
 /**
- * ftrace_printk - printf formatting in the ftrace buffer
+ * trace_printk - printf formatting in the ftrace buffer
  * @fmt: the printf format for printing
  *
- * Note: __ftrace_printk is an internal function for ftrace_printk and
- *       the @ip is passed in via the ftrace_printk macro.
+ * Note: __trace_printk is an internal function for trace_printk and
+ *       the @ip is passed in via the trace_printk macro.
  *
  * This function allows a kernel developer to debug fast path sections
  * that printk is not appropriate for. By scattering in various
@@ -341,14 +341,14 @@ ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);
  * where problems are occurring.
  *
  * This is intended as a debugging tool for the developer only.
- * Please refrain from leaving ftrace_printks scattered around in
+ * Please refrain from leaving trace_printks scattered around in
  * your code.
  */
-# define ftrace_printk(fmt...) __ftrace_printk(_THIS_IP_, fmt)
+# define trace_printk(fmt...) __trace_printk(_THIS_IP_, fmt)
 extern int
-__ftrace_printk(unsigned long ip, const char *fmt, ...)
+__trace_printk(unsigned long ip, const char *fmt, ...)
 	__attribute__ ((format (printf, 2, 3)));
-# define ftrace_vprintk(fmt, ap) __ftrace_printk(_THIS_IP_, fmt, ap)
+# define ftrace_vprintk(fmt, ap) __trace_printk(_THIS_IP_, fmt, ap)
 extern int
 __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);
 extern void ftrace_dump(void);
@@ -356,13 +356,13 @@ extern void ftrace_dump(void);
 static inline void
 ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }
 static inline int
-ftrace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
+trace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));
 
 static inline void tracing_start(void) { }
 static inline void tracing_stop(void) { }
 static inline void ftrace_off_permanent(void) { }
 static inline int
-ftrace_printk(const char *fmt, ...)
+trace_printk(const char *fmt, ...)
 {
 	return 0;
 }

kernel/trace/trace.c

@@ -48,7 +48,7 @@ unsigned long __read_mostly	tracing_thresh;
  * We need to change this state when a selftest is running.
  * A selftest will lurk into the ring-buffer to count the
  * entries inserted during the selftest although some concurrent
- * insertions into the ring-buffer such as ftrace_printk could occurred
+ * insertions into the ring-buffer such as trace_printk could occurred
  * at the same time, giving false positive or negative results.
  */
 static bool __read_mostly tracing_selftest_running;
@@ -291,7 +291,7 @@ static const char *trace_options[] = {
 	"block",
 	"stacktrace",
 	"sched-tree",
-	"ftrace_printk",
+	"trace_printk",
 	"ftrace_preempt",
 	"branch",
 	"annotate",
@@ -3768,7 +3768,7 @@ int trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args)
 }
 EXPORT_SYMBOL_GPL(trace_vprintk);
 
-int __ftrace_printk(unsigned long ip, const char *fmt, ...)
+int __trace_printk(unsigned long ip, const char *fmt, ...)
 {
 	int ret;
 	va_list ap;
@@ -3781,7 +3781,7 @@ int __ftrace_printk(unsigned long ip, const char *fmt, ...)
 	va_end(ap);
 	return ret;
 }
-EXPORT_SYMBOL_GPL(__ftrace_printk);
+EXPORT_SYMBOL_GPL(__trace_printk);
 
 int __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap)
 {

kernel/trace/trace.h

@@ -115,7 +115,7 @@ struct userstack_entry {
 };
 
 /*
- * ftrace_printk entry:
+ * trace_printk entry:
  */
 struct print_entry {
 	struct trace_entry	ent;