tracing: wrap arguments with PARAMS
Peter Zijlstra warned that TPPROTO and TPARGS might become something
other than a simple copy of itself. To prevent this from having
side effects in the TRACE_FORMAT macro in tracepoint.h, we add a
PARAMS() macro to be defined as just a wrapper.
Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 3de09fa..62d1339 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -153,7 +153,8 @@
synchronize_sched();
}
+#define PARAMS(args...) args
#define TRACE_FORMAT(name, proto, args, fmt) \
- DECLARE_TRACE(name, TPPROTO(proto), TPARGS(args))
+ DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
#endif