linux-kernel - [PATCH] ftrace: Have tracing function args depend on PROBE_EVENTS_BTF

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Message-ID: <20250401113601.17fa1129@gandalf.local.home>
Date: Tue, 1 Apr 2025 11:36:01 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: LKML <linux-kernel@...r.kernel.org>, Linux Trace Kernel
 <linux-trace-kernel@...r.kernel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, Mark Rutland <mark.rutland@....com>,
 Christian Loehle <Christian.Loehle@....com>, Leon Romanovsky
 <leon@...nel.org>
Subject: [PATCH] ftrace: Have tracing function args depend on
 PROBE_EVENTS_BTF_ARGS

From: Steven Rostedt <rostedt@...dmis.org>

The option PROBE_EVENTS_BTF_ARGS enables the functions
btf_find_func_proto() and btf_get_func_param() which are used by the
function argument tracing code. The option FUNCTION_TRACE_ARGS was
dependent on the same configs that PROBE_EVENTS_BTF_ARGS was dependent on,
but it was also dependent on PROBE_EVENTS_BTF_ARGS. In fact, if
PROBE_EVENTS_BTF_ARGS is supported then FUNCTION_TRACE_ARGS is supported.

Just make FUNCTION_TRACE_ARGS depend on PROBE_EVENTS_BTF_ARGS.

Fixes: 533c20b062d7c ("ftrace: Add print_function_args()")
Closes: https://lore.kernel.org/all/DB9PR08MB75820599801BAD118D123D7D93AD2@DB9PR08MB7582.eurprd08.prod.outlook.com/
Reported-by: Christian Loehle <Christian.Loehle@....com>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/Kconfig | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 033fba0633cf..a3f35c7d83b6 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -265,8 +265,7 @@ config FUNCTION_GRAPH_RETADDR
 
 config FUNCTION_TRACE_ARGS
        bool
-	depends on HAVE_FUNCTION_ARG_ACCESS_API
-	depends on DEBUG_INFO_BTF
+	depends on PROBE_EVENTS_BTF_ARGS
 	default y
 	help
 	  If supported with function argument access API and BTF, then
-- 
2.47.2