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>

6 files changed, 49 insertions, 22 deletions

diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index df5b085c4150..0440bea8f6bb 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -140,9 +140,16 @@ extern int filter_current_check_discard(struct ftrace_event_call *call,
                                         void *rec,
                                         struct ring_buffer_event *event);
 
+enum {
+        FILTER_OTHER = 0,
+        FILTER_STATIC_STRING,
+        FILTER_DYN_STRING,
+};
+
 extern int trace_define_field(struct ftrace_event_call *call,
                               const char *type, const char *name,
-                              int offset, int size, int is_signed);
+                              int offset, int size, int is_signed,
+                              int filter_type);
 extern int trace_define_common_fields(struct ftrace_event_call *call);
 
 #define is_signed_type(type)    (((type)(-1)) < 0)
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 127400255e4c..1b1f742a6045 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -21,6 +21,9 @@
 #undef __field
 #define __field(type, item)             type    item;
 
+#undef __field_ext
+#define __field_ext(type, item, filter_type)    type    item;
+
 #undef __array
 #define __array(type, item, len)        type    item[len];
 
@@ -62,7 +65,10 @@
  */
 
 #undef __field
-#define __field(type, item);
+#define __field(type, item)
+
+#undef __field_ext
+#define __field_ext(type, item, filter_type)
 
 #undef __array
 #define __array(type, item, len)
@@ -110,6 +116,9 @@
         if (!ret)                                                       \
                 return 0;
 
+#undef __field_ext
+#define __field_ext(type, item, filter_type)    __field(type, item)
+
 #undef __array
 #define __array(type, item, len)                                                \
         ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t"    \
@@ -265,28 +274,33 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags)	\
         
 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 
-#undef __field
-#define __field(type, item)                                             \
+#undef __field_ext
+#define __field_ext(type, item, filter_type)                            \
         ret = trace_define_field(event_call, #type, #item,              \
                                  offsetof(typeof(field), item),         \
-                                 sizeof(field.item), is_signed_type(type));     \
+                                 sizeof(field.item),                    \
+                                 is_signed_type(type), filter_type);    \
         if (ret)                                                        \
                 return ret;
 
+#undef __field
+#define __field(type, item)     __field_ext(type, item, FILTER_OTHER)
+
 #undef __array
 #define __array(type, item, len)                                        \
         BUILD_BUG_ON(len > MAX_FILTER_STR_VAL);                         \
         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
                                  offsetof(typeof(field), item),         \
-                                 sizeof(field.item), 0);                \
+                                 sizeof(field.item), 0, FILTER_OTHER);  \
         if (ret)                                                        \
                 return ret;
 
 #undef __dynamic_array
 #define __dynamic_array(type, item, len)                                       \
         ret = trace_define_field(event_call, "__data_loc " #type "[]", #item,  \
-                                offsetof(typeof(field), __data_loc_##item),    \
-                                 sizeof(field.__data_loc_##item), 0);
+                                 offsetof(typeof(field), __data_loc_##item),   \
+                                 sizeof(field.__data_loc_##item), 0,           \
+                                 FILTER_OTHER);
 
 #undef __string
 #define __string(item, src) __dynamic_array(char, item, -1)
@@ -320,6 +334,9 @@ ftrace_define_fields_##call(struct ftrace_event_call *event_call)	\
 #undef __field
 #define __field(type, item)
 
+#undef __field_ext
+#define __field_ext(type, item, filter_type)
+
 #undef __array
 #define __array(type, item, len)
 
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;
 
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 22e6d822bbaa..8a8e576733fc 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -475,12 +475,6 @@ static int filter_add_pred_fn(struct filter_parse_state *ps,
         return 0;
 }
 
-enum {
-        FILTER_OTHER = 0,
-        FILTER_STATIC_STRING,
-        FILTER_DYN_STRING,
-};
-
 int filter_assign_type(const char *type)
 {
         if (strstr(type, "__data_loc") && strstr(type, "char"))
diff --git a/kernel/trace/trace_export.c b/kernel/trace/trace_export.c
index 70875303ae46..029a91f42287 100644
--- a/kernel/trace/trace_export.c
+++ b/kernel/trace/trace_export.c
@@ -158,7 +158,8 @@ __attribute__((section("_ftrace_events"))) event_##call = {		\
 #define TRACE_FIELD(type, item, assign)                                 \
         ret = trace_define_field(event_call, #type, #item,              \
                                  offsetof(typeof(field), item),         \
-                                 sizeof(field.item), is_signed_type(type));     \
+                                 sizeof(field.item),                    \
+                                 is_signed_type(type), FILTER_OTHER);   \
         if (ret)                                                        \
                 return ret;
 
@@ -166,7 +167,7 @@ __attribute__((section("_ftrace_events"))) event_##call = {		\
 #define TRACE_FIELD_SPECIAL(type, item, len, cmd)                       \
         ret = trace_define_field(event_call, #type "[" #len "]", #item, \
                                  offsetof(typeof(field), item),         \
-                                 sizeof(field.item), 0);                \
+                                 sizeof(field.item), 0, FILTER_OTHER);  \
         if (ret)                                                        \
                 return ret;
 
@@ -174,7 +175,8 @@ __attribute__((section("_ftrace_events"))) event_##call = {		\
 #define TRACE_FIELD_SIGN(type, item, assign, is_signed)                 \
         ret = trace_define_field(event_call, #type, #item,              \
                                  offsetof(typeof(field), item),         \
-                                 sizeof(field.item), is_signed);        \
+                                 sizeof(field.item), is_signed,         \
+                                 FILTER_OTHER);                         \
         if (ret)                                                        \
                 return ret;
 
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 46c1b977a2cb..97a2454760b0 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -194,7 +194,8 @@ int syscall_enter_define_fields(struct ftrace_event_call *call)
         for (i = 0; i < meta->nb_args; i++) {
                 ret = trace_define_field(call, meta->types[i],
                                          meta->args[i], offset,
-                                         sizeof(unsigned long), 0);
+                                         sizeof(unsigned long), 0,
+                                         FILTER_OTHER);
                 offset += sizeof(unsigned long);
         }
 
@@ -210,7 +211,8 @@ int syscall_exit_define_fields(struct ftrace_event_call *call)
         if (ret)
                 return ret;
 
-        ret = trace_define_field(call, SYSCALL_FIELD(unsigned long, ret), 0);
+        ret = trace_define_field(call, SYSCALL_FIELD(unsigned long, ret), 0,
+                                 FILTER_OTHER);
 
         return ret;
 }