From: Steven Rostedt on


This fixes the warning/error on PowerPC.

Please pull the latest tip/perf/core tree, which can be found at:


Steven Rostedt (1):
tracing: Add __used annotation to event variable

include/trace/ftrace.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
commit 49c177461bfbedeccbab22bf3905db2f9da7f1c3
Author: Steven Rostedt <srostedt(a)>
Date: Tue May 25 06:19:35 2010 -0700

tracing: Add __used annotation to event variable

The TRACE_EVENT() macros automate creation of trace events. To automate
initialization, the set up variables are loaded in a special section
that is read on boot up. GCC is not aware that these static variables
are used and will complain about them if we do not inform GCC that
they are indeed used.

One of the declarations of the event element was missing a __used
annotation. This patch adds it.

Reported-by: Ingo Molnar <mingo(a)>
Signed-off-by: Steven Rostedt <rostedt(a)>

diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 0152b86..34bead7 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -68,7 +68,7 @@

#define DEFINE_EVENT(template, name, proto, args) \
- static struct ftrace_event_call \
+ static struct ftrace_event_call __used \
__attribute__((__aligned__(4))) event_##name


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