linux-kernel - [PATCH v4 1/3] ftrace: Build trace_btf.c when CONFIG_DEBUG_INFO

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Message-Id: <20251215034153.2367756-2-dolinux.peng@gmail.com>
Date: Mon, 15 Dec 2025 11:41:51 +0800
From: Donglin Peng <dolinux.peng@...il.com>
To: rostedt@...dmis.org
Cc: mhiramat@...nel.org,
	linux-trace-kernel@...r.kernel.org,
	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	pengdonglin <pengdonglin@...omi.com>,
	Xiaoqin Zhang <zhangxiaoqin@...omi.com>
Subject: [PATCH v4 1/3] ftrace: Build trace_btf.c when CONFIG_DEBUG_INFO_BTF is enabled

From: pengdonglin <pengdonglin@...omi.com>

The trace_btf.c file provides BTF helper functions used by the ftrace
subsystem. This change makes its compilation solely dependent on
CONFIG_DEBUG_INFO_BTF, allowing features like funcgraph-retval to also
utilize these helpers.

Additionally, the redundant dependency on CONFIG_PROBE_EVENTS_BTF_ARGS
is removed, as CONFIG_DEBUG_INFO_BTF already depends on
CONFIG_BPF_SYSCALL.

Cc: Steven Rostedt (Google) <rostedt@...dmis.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Xiaoqin Zhang <zhangxiaoqin@...omi.com>
Signed-off-by: pengdonglin <pengdonglin@...omi.com>
---
 kernel/trace/Kconfig  | 2 +-
 kernel/trace/Makefile | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index e1214b9dc990..653c1fcefa4c 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -755,7 +755,7 @@ config FPROBE_EVENTS
 config PROBE_EVENTS_BTF_ARGS
 	depends on HAVE_FUNCTION_ARG_ACCESS_API
 	depends on FPROBE_EVENTS || KPROBE_EVENTS
-	depends on DEBUG_INFO_BTF && BPF_SYSCALL
+	depends on DEBUG_INFO_BTF
 	bool "Support BTF function arguments for probe events"
 	default y
 	help
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index fc5dcc888e13..6c4bf5a6c4f3 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -116,7 +116,7 @@ obj-$(CONFIG_KGDB_KDB) += trace_kdb.o
 endif
 obj-$(CONFIG_DYNAMIC_EVENTS) += trace_dynevent.o
 obj-$(CONFIG_PROBE_EVENTS) += trace_probe.o
-obj-$(CONFIG_PROBE_EVENTS_BTF_ARGS) += trace_btf.o
+obj-$(CONFIG_DEBUG_INFO_BTF) += trace_btf.o
 obj-$(CONFIG_UPROBE_EVENTS) += trace_uprobe.o
 obj-$(CONFIG_BOOTTIME_TRACING) += trace_boot.o
 obj-$(CONFIG_FTRACE_RECORD_RECURSION) += trace_recursion_record.o
-- 
2.34.1