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>

diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index df5b085c415068bac6bf099a9317a274c4b11731..0440bea8f6bb678e620faa922ee43afa598d35ec 100644 (file)
--- 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 127400255e4c3400ef95245f09e9848c640505e0..1b1f742a604528c0f35832799a55eebc8f651b79 100644 (file)
--- 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 5740e90f4ca11ae1aace7a759998da68431234ac..d33bcdeffe699d5423b4682df767fb00e63d257b 100644 (file)
--- 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 22e6d822bbaa4ba6a348cf265a5201ef8c387852..8a8e576733fc175b15511646b081d37f4785758d 100644 (file)
--- 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 70875303ae463301e57ee12029f73d1ae7c4a1d8..029a91f422874ca91d2f4da2406f597368ddf578 100644 (file)
--- 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 46c1b977a2cba2195c480a9af1a60415a5619412..97a2454760b00571edba7bd9724cc6f8ec186e25 100644 (file)
--- 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;
 }