tracing: Move event storage for array from macro to standalone function

The code that shows array fields for events is defined for all events.
This can add up quite a bit when you have over 500 events.

By making helper functions in the core kernel to do the work
instead, we can shrink the size of the kernel down a bit.

With a kernel configured with 502 events, the change in size was:

   text    data     bss     dec     hex filename
12990946        1913568 9785344 24689858        178bcc2 /tmp/vmlinux
12987390        1913504 9785344 24686238        178ae9e /tmp/vmlinux.patched

That's a total of 3556 bytes, which comes down to 7 bytes per event.
Although it's not much, this code is just called at initialization of
the events.

Link: http://lkml.kernel.org/r/20120810034708.084036335@goodmis.org

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

1 files changed, 4 insertions, 4 deletions

diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index a91ab93d7250..ffe642eb84fa 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -202,6 +202,10 @@ extern int ftrace_event_reg(struct ftrace_event_call *event,
 int ftrace_output_event(struct trace_iterator *iter, struct ftrace_event_call *event,
                         char *fmt, ...);
 
+int ftrace_event_define_field(struct ftrace_event_call *call,
+                              char *type, int len, char *item, int offset,
+                              int field_size, int sign, int filter);
+
 enum {
         TRACE_EVENT_FL_FILTERED_BIT,
         TRACE_EVENT_FL_CAP_ANY_BIT,
@@ -500,10 +504,6 @@ enum {
         FILTER_TRACE_FN,
 };
 
-#define EVENT_STORAGE_SIZE 128
-extern struct mutex event_storage_mutex;
-extern char event_storage[EVENT_STORAGE_SIZE];
-
 extern int trace_event_raw_init(struct ftrace_event_call *call);
 extern int trace_define_field(struct ftrace_event_call *call, const char *type,
                               const char *name, int offset, int size,