tracing/filters: Add __field_ext() to TRACE_EVENT

Add __field_ext(), so a field can be assigned to a specific
filter_type, which matches a corresponding filter function.

For example, a later patch will allow this:
	__field_ext(const char *, str, FILTER_PTR_STR);

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <4A7B9272.6050709@cn.fujitsu.com>

[
  Fixed a -1 to FILTER_OTHER
  Forward ported to latest kernel.
]

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 8 insertions, 3 deletions

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 5740e90f4ca1..d33bcdeffe69 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -28,7 +28,8 @@ DEFINE_MUTEX(event_mutex);
 LIST_HEAD(ftrace_events);
 
 int trace_define_field(struct ftrace_event_call *call, const char *type,
-                       const char *name, int offset, int size, int is_signed)
+                       const char *name, int offset, int size, int is_signed,
+                       int filter_type)
 {
         struct ftrace_event_field *field;
 
@@ -44,7 +45,11 @@ int trace_define_field(struct ftrace_event_call *call, const char *type,
         if (!field->type)
                 goto err;
 
-        field->filter_type = filter_assign_type(type);
+        if (filter_type == FILTER_OTHER)
+                field->filter_type = filter_assign_type(type);
+        else
+                field->filter_type = filter_type;
+
         field->offset = offset;
         field->size = size;
         field->is_signed = is_signed;
@@ -68,7 +73,7 @@ EXPORT_SYMBOL_GPL(trace_define_field);
         ret = trace_define_field(call, #type, "common_" #item,          \
                                  offsetof(typeof(ent), item),           \
                                  sizeof(ent.item),                      \
-                                 is_signed_type(type));                 \
+                                 is_signed_type(type), FILTER_OTHER);   \
         if (ret)                                                        \
                 return ret;