tracing: Use defined fields and print_fmt to print formats

The calls ftrace_format_##call() and ftrace_define_fields_##call()
are almost duplicate in functionality. With the addition of the
print_fmt in previous patches, these two functions can be merged
into one.

The trace_define_field() defines the fields and links them into
the struct ftrace_event_call. The previous patches introduced
the print_fmt field and this can now be used with the trace_define_field()
to create the event format file fields and print_fmt field.

The struct ftrace_event_call->fields are used to print the fields
The struct ftrace_event_call->print_fmt is used to print
the "print fmt: XXXXXXXXXXX" line.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
LKML-Reference: <4B273D49.5000006@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 41 insertions, 24 deletions

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 189b09baf4f..250ec865d5f 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -528,33 +528,16 @@ extern char *__bad_type_size(void);
         #type, "common_" #name, offsetof(typeof(field), name),          \
                 sizeof(field.name), is_signed_type(type)
 
-static int trace_write_header(struct trace_seq *s)
-{
-        struct trace_entry field;
-
-        /* struct trace_entry */
-        return trace_seq_printf(s,
-                        "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\tsigned:%u;\n"
-                        "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\tsigned:%u;\n"
-                        "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\tsigned:%u;\n"
-                        "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\tsigned:%u;\n"
-                        "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\tsigned:%u;\n"
-                        "\n",
-                        FIELD(unsigned short, type),
-                        FIELD(unsigned char, flags),
-                        FIELD(unsigned char, preempt_count),
-                        FIELD(int, pid),
-                        FIELD(int, lock_depth));
-}
-
 static ssize_t
 event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
                   loff_t *ppos)
 {
         struct ftrace_event_call *call = filp->private_data;
+        struct ftrace_event_field *field;
         struct trace_seq *s;
+        int common_field_count = 5;
         char *buf;
-        int r;
+        int r = 0;
 
         if (*ppos)
                 return 0;
@@ -565,14 +548,48 @@ event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
 
         trace_seq_init(s);
 
-        /* If any of the first writes fail, so will the show_format. */
-
         trace_seq_printf(s, "name: %s\n", call->name);
         trace_seq_printf(s, "ID: %d\n", call->id);
         trace_seq_printf(s, "format:\n");
-        trace_write_header(s);
 
-        r = call->show_format(call, s);
+        list_for_each_entry_reverse(field, &call->fields, link) {
+                /*
+                 * Smartly shows the array type(except dynamic array).
+                 * Normal:
+                 *      field:TYPE VAR
+                 * If TYPE := TYPE[LEN], it is shown:
+                 *      field:TYPE VAR[LEN]
+                 */
+                const char *array_descriptor = strchr(field->type, '[');
+
+                if (!strncmp(field->type, "__data_loc", 10))
+                        array_descriptor = NULL;
+
+                if (!array_descriptor) {
+                        r = trace_seq_printf(s, "\tfield:%s %s;\toffset:%u;"
+                                        "\tsize:%u;\tsigned:%d;\n",
+                                        field->type, field->name, field->offset,
+                                        field->size, !!field->is_signed);
+                } else {
+                        r = trace_seq_printf(s, "\tfield:%.*s %s%s;\toffset:%u;"
+                                        "\tsize:%u;\tsigned:%d;\n",
+                                        (int)(array_descriptor - field->type),
+                                        field->type, field->name,
+                                        array_descriptor, field->offset,
+                                        field->size, !!field->is_signed);
+                }
+
+                if (--common_field_count == 0)
+                        r = trace_seq_printf(s, "\n");
+
+                if (!r)
+                        break;
+        }
+
+        if (r)
+                r = trace_seq_printf(s, "\nprint fmt: %s\n",
+                                call->print_fmt);
+
         if (!r) {
                 /*
                  * ug!  The format output is bigger than a PAGE!!