tracing/kprobe: Check registered state using kprobe

Change registered check only by trace_kprobe and remove
TP_FLAG_REGISTERED from trace_probe, since this feature
is only used for trace_kprobe.

Link: http://lkml.kernel.org/r/155931588704.28323.4952266828256245833.stgit@devnote2

Signed-off-by: Masami Hiramatsu <[e-mail]>
Signed-off-by: Steven Rostedt (VMware) <[e-mail]>

kernel/trace/trace_kprobe.c

···
 	return nhit;
 }
 
+static nokprobe_inline bool trace_kprobe_is_registered(struct trace_kprobe *tk)
+{
+	return !(list_empty(&tk->rp.kp.list) &&
+		 hlist_unhashed(&tk->rp.kp.hlist));
+}
+
 /* Return 0 if it fails to find the symbol address */
 static nokprobe_inline
 unsigned long trace_kprobe_address(struct trace_kprobe *tk)
···
 		tk->rp.kp.pre_handler = kprobe_dispatcher;
 
 	tk->rp.maxactive = maxactive;
+	INIT_HLIST_NODE(&tk->rp.kp.hlist);
+	INIT_LIST_HEAD(&tk->rp.kp.list);
 
 	ret = trace_probe_init(&tk->tp, event, group);
 	if (ret < 0)
···
 {
 	int ret = 0;
 
-	if (trace_probe_is_registered(&tk->tp) && !trace_kprobe_has_gone(tk)) {
+	if (trace_kprobe_is_registered(tk) && !trace_kprobe_has_gone(tk)) {
 		if (trace_kprobe_is_return(tk))
 			ret = enable_kretprobe(&tk->rp);
 		else
···
 	} else
 		trace_probe_clear_flag(tp, TP_FLAG_PROFILE);
 
-	if (!trace_probe_is_enabled(tp) && trace_probe_is_registered(tp)) {
+	if (!trace_probe_is_enabled(tp) && trace_kprobe_is_registered(tk)) {
 		if (trace_kprobe_is_return(tk))
 			disable_kretprobe(&tk->rp);
 		else
···
 {
 	int i, ret;
 
-	if (trace_probe_is_registered(&tk->tp))
+	if (trace_kprobe_is_registered(tk))
 		return -EINVAL;
 
 	if (within_notrace_func(tk)) {
···
 	else
 		ret = register_kprobe(&tk->rp.kp);
 
-	if (ret == 0)
-		trace_probe_set_flag(&tk->tp, TP_FLAG_REGISTERED);
 	return ret;
 }
 
 /* Internal unregister function - just handle k*probes and flags */
 static void __unregister_trace_kprobe(struct trace_kprobe *tk)
 {
-	if (trace_probe_is_registered(&tk->tp)) {
+	if (trace_kprobe_is_registered(tk)) {
 		if (trace_kprobe_is_return(tk))
 			unregister_kretprobe(&tk->rp);
 		else
 			unregister_kprobe(&tk->rp.kp);
-		trace_probe_clear_flag(&tk->tp, TP_FLAG_REGISTERED);
-		/* Cleanup kprobe for reuse */
+		/* Cleanup kprobe for reuse and mark it unregistered */
+		INIT_HLIST_NODE(&tk->rp.kp.hlist);
+		INIT_LIST_HEAD(&tk->rp.kp.list);
 		if (tk->rp.kp.symbol_name)
 			tk->rp.kp.addr = NULL;
 	}

kernel/trace/trace_probe.h

···
 /* Flags for trace_probe */
 #define TP_FLAG_TRACE		1
 #define TP_FLAG_PROFILE		2
-#define TP_FLAG_REGISTERED	4
 
 /* data_loc: data location, compatible with u32 */
 #define make_data_loc(len, offs)	\
···
 static inline bool trace_probe_is_enabled(struct trace_probe *tp)
 {
 	return trace_probe_test_flag(tp, TP_FLAG_TRACE | TP_FLAG_PROFILE);
-}
-
-static inline bool trace_probe_is_registered(struct trace_probe *tp)
-{
-	return trace_probe_test_flag(tp, TP_FLAG_REGISTERED);
 }
 
 static inline const char *trace_probe_name(struct trace_probe *tp)