tracing: Add a helper function for event print functions

Move duplicate code in event print functions to a helper function.

This shrinks the size of the kernel by ~13K.

   text    data     bss     dec     hex filename
6596137 1743966 10138672        18478775        119f6b7 vmlinux.o.old
6583002 1743849 10138672        18465523        119c2f3 vmlinux.o.new

Link: http://lkml.kernel.org/r/51258746.2060304@huawei.com

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 6 insertions, 17 deletions

diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index e5d140a91fd7..17a77fcac2a2 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -227,29 +227,18 @@ static notrace enum print_line_t					\
 ftrace_raw_output_##call(struct trace_iterator *iter, int flags,        \
                          struct trace_event *trace_event)               \
 {                                                                       \
-        struct ftrace_event_call *event;                                \
         struct trace_seq *s = &iter->seq;                               \
+        struct trace_seq __maybe_unused *p = &iter->tmp_seq;            \
         struct ftrace_raw_##call *field;                                \
-        struct trace_entry *entry;                                      \
-        struct trace_seq *p = &iter->tmp_seq;                           \
         int ret;                                                        \
                                                                         \
-        event = container_of(trace_event, struct ftrace_event_call,     \
-                             event);                                    \
-                                                                        \
-        entry = iter->ent;                                              \
+        field = (typeof(field))iter->ent;                               \
                                                                         \
-        if (entry->type != event->event.type) {                         \
-                WARN_ON_ONCE(1);                                        \
-                return TRACE_TYPE_UNHANDLED;                            \
-        }                                                               \
-                                                                        \
-        field = (typeof(field))entry;                                   \
-                                                                        \
-        trace_seq_init(p);                                              \
-        ret = trace_seq_printf(s, "%s: ", event->name);                 \
+        ret = ftrace_raw_output_prep(iter, trace_event);                \
         if (ret)                                                        \
-                ret = trace_seq_printf(s, print);                       \
+                return ret;                                             \
+                                                                        \
+        ret = trace_seq_printf(s, print);                               \
         if (!ret)                                                       \
                 return TRACE_TYPE_PARTIAL_LINE;                         \
                                                                         \