tracing: probeevent: Return consumed bytes of dynamic area

Cleanup string fetching routine so that returns the consumed
bytes of dynamic area and store the string information as
data_loc format instead of data_rloc.
This simplifies the fetcharg loop.

Link: http://lkml.kernel.org/r/152465874163.26224.12125143907501289031.stgit@devbox

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

kernel/trace/trace_probe.h

@@ -54,29 +54,15 @@
 #define TP_FLAG_PROFILE		2
 #define TP_FLAG_REGISTERED	4
 
+/* data_loc: data location, compatible with u32 */
+#define make_data_loc(len, offs)	\
+	(((u32)(len) << 16) | ((u32)(offs) & 0xffff))
+#define get_loc_len(dl)		((u32)(dl) >> 16)
+#define get_loc_offs(dl)	((u32)(dl) & 0xffff)
 
-/* data_rloc: data relative location, compatible with u32 */
-#define make_data_rloc(len, roffs)	\
-	(((u32)(len) << 16) | ((u32)(roffs) & 0xffff))
-#define get_rloc_len(dl)		((u32)(dl) >> 16)
-#define get_rloc_offs(dl)		((u32)(dl) & 0xffff)
-
-/*
- * Convert data_rloc to data_loc:
- *  data_rloc stores the offset from data_rloc itself, but data_loc
- *  stores the offset from event entry.
- */
-#define convert_rloc_to_loc(dl, offs)	((u32)(dl) + (offs))
-
-static nokprobe_inline void *get_rloc_data(u32 *dl)
-{
-	return (u8 *)dl + get_rloc_offs(*dl);
-}
-
-/* For data_loc conversion */
 static nokprobe_inline void *get_loc_data(u32 *dl, void *ent)
 {
-	return (u8 *)ent + get_rloc_offs(*dl);
+	return (u8 *)ent + get_loc_offs(*dl);
 }
 
 /* Printing function type */