linux-kernel - [PATCH] tracing: Fix DECLARE_TRACE

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Message-ID: <20250128111926.303093-1-gmonaco@redhat.com>
Date: Tue, 28 Jan 2025 12:19:26 +0100
From: Gabriele Monaco <gmonaco@...hat.com>
To: Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Cc: Gabriele Monaco <gmonaco@...hat.com>
Subject: [PATCH] tracing: Fix DECLARE_TRACE_CONDITION

Commit 287050d39026 ("tracing: Add TRACE_EVENT_CONDITIONAL()") adds
macros to define conditional trace events (TRACE_EVENT_CONDITIONAL) and
tracepoints (DECLARE_TRACE_CONDITION), but sets up functionality for
direct use only for the former.
Any attempt to use DECLARE_TRACE_CONDITION fails the build.

Add preprocessor bits in define_trace.h to allow usage of
DECLARE_TRACE_CONDITION just like DECLARE_TRACE.

Fixes: 287050d39026 ("tracing: Add TRACE_EVENT_CONDITIONAL()")
Signed-off-by: Gabriele Monaco <gmonaco@...hat.com>
---
 include/trace/define_trace.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/trace/define_trace.h b/include/trace/define_trace.h
index e1c1079f8c8d..ed52d0506c69 100644
--- a/include/trace/define_trace.h
+++ b/include/trace/define_trace.h
@@ -76,6 +76,10 @@
 #define DECLARE_TRACE(name, proto, args)	\
 	DEFINE_TRACE(name, PARAMS(proto), PARAMS(args))
 
+#undef DECLARE_TRACE_CONDITION
+#define DECLARE_TRACE_CONDITION(name, proto, args, cond)	\
+	DEFINE_TRACE(name, PARAMS(proto), PARAMS(args))
+
 /* If requested, create helpers for calling these tracepoints from Rust. */
 #ifdef CREATE_RUST_TRACE_POINTS
 #undef DEFINE_RUST_DO_TRACE
@@ -108,6 +112,8 @@
 /* Make all open coded DECLARE_TRACE nops */
 #undef DECLARE_TRACE
 #define DECLARE_TRACE(name, proto, args)
+#undef DECLARE_TRACE_CONDITION
+#define DECLARE_TRACE_CONDITION(name, proto, args, cond)
 
 #ifdef TRACEPOINTS_ENABLED
 #include <trace/trace_events.h>
@@ -129,6 +135,7 @@
 #undef DEFINE_EVENT_CONDITION
 #undef TRACE_HEADER_MULTI_READ
 #undef DECLARE_TRACE
+#undef DECLARE_TRACE_CONDITION
 
 /* Only undef what we defined in this file */
 #ifdef UNDEF_TRACE_INCLUDE_FILE

base-commit: 9c5968db9e625019a0ee5226c7eebef5519d366a
-- 
2.48.1