tracing/events: put TP_fast_assign into braces

Currently TP_fast_assign has a limitation that we can't define local
variables in it.

Here's one use case when we introduce __dynamic_array():

TP_fast_assign(
	type *p = __get_dynamic_array(item);

	foo(p);
	bar(p);
),

[ Impact: allow defining local variables in TP_fast_assign ]

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <4A2384B1.90100@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 9276ec4..ee92682 100644 (file)
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -471,7 +471,7 @@ static void ftrace_raw_event_##call(proto)                          \
                return;                                                 \
        entry   = ring_buffer_event_data(event);                        \
                                                                        \
-       assign;                                                         \
+       { assign; }                                                     \
                                                                        \
        if (!filter_current_check_discard(event_call, entry, event))    \
                trace_nowake_buffer_unlock_commit(event, irq_flags, pc); \