tracing: Move find_event_field() into trace_events.c

By moving find_event_field() and trace_find_field() into trace_events.c,
the ftrace_common_fields list and trace_get_fields() can become local to
the trace_events.c file.

find_event_field() is renamed to trace_find_event_field() to conform to
the tracing global function names.

Link: http://lkml.kernel.org/r/513D8426.9070109@huawei.com

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
[ rostedt: Modified trace_find_field() to trace_find_event_field() ]
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

3 files changed, 32 insertions, 34 deletions

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 5cc52361bc9f..9e014582e763 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -995,8 +995,6 @@ struct filter_pred {
         unsigned short          right;
 };
 
-extern struct list_head ftrace_common_fields;
-
 extern enum regex_type
 filter_parse_regex(char *buff, int len, char **search, int *not);
 extern void print_event_filter(struct ftrace_event_call *call,
@@ -1009,8 +1007,8 @@ extern void print_subsystem_event_filter(struct event_subsystem *system,
                                          struct trace_seq *s);
 extern int filter_assign_type(const char *type);
 
-struct list_head *
-trace_get_fields(struct ftrace_event_call *event_call);
+struct ftrace_event_field *
+trace_find_event_field(struct ftrace_event_call *call, char *name);
 
 static inline int
 filter_check_discard(struct ftrace_event_call *call, void *rec,
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index c636523b1a59..ba523d7beea2 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -34,7 +34,7 @@ char event_storage[EVENT_STORAGE_SIZE];
 EXPORT_SYMBOL_GPL(event_storage);
 
 LIST_HEAD(ftrace_events);
-LIST_HEAD(ftrace_common_fields);
+static LIST_HEAD(ftrace_common_fields);
 
 #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO)
 
@@ -54,7 +54,7 @@ static struct kmem_cache *file_cachep;
 #define while_for_each_event_file()             \
         }
 
-struct list_head *
+static struct list_head *
 trace_get_fields(struct ftrace_event_call *event_call)
 {
         if (!event_call->class->get_fields)
@@ -62,6 +62,33 @@ trace_get_fields(struct ftrace_event_call *event_call)
         return event_call->class->get_fields(event_call);
 }
 
+static struct ftrace_event_field *
+__find_event_field(struct list_head *head, char *name)
+{
+        struct ftrace_event_field *field;
+
+        list_for_each_entry(field, head, link) {
+                if (!strcmp(field->name, name))
+                        return field;
+        }
+
+        return NULL;
+}
+
+struct ftrace_event_field *
+trace_find_event_field(struct ftrace_event_call *call, char *name)
+{
+        struct ftrace_event_field *field;
+        struct list_head *head;
+
+        field = __find_event_field(&ftrace_common_fields, name);
+        if (field)
+                return field;
+
+        head = trace_get_fields(call);
+        return __find_event_field(head, name);
+}
+
 static int __trace_define_field(struct list_head *head, const char *type,
                                 const char *name, int offset, int size,
                                 int is_signed, int filter_type)
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 2a22a177ab44..a6361178de5a 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -658,33 +658,6 @@ void print_subsystem_event_filter(struct event_subsystem *system,
         mutex_unlock(&event_mutex);
 }
 
-static struct ftrace_event_field *
-__find_event_field(struct list_head *head, char *name)
-{
-        struct ftrace_event_field *field;
-
-        list_for_each_entry(field, head, link) {
-                if (!strcmp(field->name, name))
-                        return field;
-        }
-
-        return NULL;
-}
-
-static struct ftrace_event_field *
-find_event_field(struct ftrace_event_call *call, char *name)
-{
-        struct ftrace_event_field *field;
-        struct list_head *head;
-
-        field = __find_event_field(&ftrace_common_fields, name);
-        if (field)
-                return field;
-
-        head = trace_get_fields(call);
-        return __find_event_field(head, name);
-}
-
 static int __alloc_pred_stack(struct pred_stack *stack, int n_preds)
 {
         stack->preds = kcalloc(n_preds + 1, sizeof(*stack->preds), GFP_KERNEL);
@@ -1337,7 +1310,7 @@ static struct filter_pred *create_pred(struct filter_parse_state *ps,
                 return NULL;
         }
 
-        field = find_event_field(call, operand1);
+        field = trace_find_event_field(call, operand1);
         if (!field) {
                 parse_error(ps, FILT_ERR_FIELD_NOT_FOUND, 0);
                 return NULL;