linux: sysfs: use tracing_on as tracing_enabled is deprecated

tracing_enabled use in the kernel is being deprecated as per commit
6752ab4a9c30 [tracing: Deprecate tracing_enabled for tracing_on] in
the linux mainline kernel. tracing_enabled use will generate a warning
and may no longer function as expected, therefore move to use tracing_on.

Upstream-Status: Pending

Signed-off-by: Dennis Hall <dennis.hall@windriver.com>

Index: latencytop-0.5/fsync.c
===================================================================
--- latencytop-0.5.orig/fsync.c	2012-08-03 10:45:49.000000000 -0400
+++ latencytop-0.5/fsync.c	2012-08-03 10:48:39.000000000 -0400
@@ -149,19 +149,19 @@
  * cd /sys/kernel/debug/tracing
  * echo fsync > current_tracer
  * echo ftrace_printk > iter_ctrl 
- * echo 1 > tracing_enabled
+ * echo 1 > tracing_on
  */
 	ret = system("/bin/mount -t debugfs none /sys/kernel/debug/");
 	if (!ret) 
 		return -1;
 	write_to_file("/sys/kernel/debug/tracing/current_tracer", "fsync");	
 	write_to_file("/sys/kernel/debug/tracing/iter_ctrl", "ftrace_printk");	
-	write_to_file("/sys/kernel/debug/tracing/tracing_enabled", "1");
+	write_to_file("/sys/kernel/debug/tracing/tracing_on", "1");
 }
 
 int disable_fsync_tracer(void)
 {
-	write_to_file("/sys/kernel/debug/tracing/tracing_enabled", "0");
+	write_to_file("/sys/kernel/debug/tracing/tracing_on", "0");
 }
 
 
@@ -339,8 +339,8 @@
 		if (curduration > 5)
 			curduration = 5;
 		/* clear the ftrace buffer */
-		write_to_file("/sys/kernel/debug/tracing/tracing_enabled", "0");
-		write_to_file("/sys/kernel/debug/tracing/tracing_enabled", "1");
+		write_to_file("/sys/kernel/debug/tracing/tracing_on", "0");
+		write_to_file("/sys/kernel/debug/tracing/tracing_on", "1");
 		key = select(1, &rfds, NULL, NULL, &end);
 		parse_ftrace();
 		print_global_list();