linux-kernel - [PATCH bpf-next v3 2/2] bpf: relocates the BPF net tracepoint definitions

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Message-ID: <20250414161153.14990-2-jiayuan.chen@linux.dev>
Date: Tue, 15 Apr 2025 00:11:46 +0800
From: Jiayuan Chen <jiayuan.chen@...ux.dev>
To: bpf@...r.kernel.org
Cc: mrpre@....com,
	Jiayuan Chen <jiayuan.chen@...ux.dev>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	John Fastabend <john.fastabend@...il.com>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Jakub Sitnicki <jakub@...udflare.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Subject: [PATCH bpf-next v3 2/2] bpf: relocates the BPF net tracepoint definitions

This commit relocates the BPF tracepoint definitions for XDP and sockmap
from the kernel directory to net/bpf.

This ensures that these tracepoints are controlled by the CONFIG_NET,
avoiding unnecessary function definitions when the CONFIG_NET is disabled.
Additionally, it prevents build failures caused by the use of net module
functions when CONFIG_NET is not enabled.

Signed-off-by: Jiayuan Chen <jiayuan.chen@...ux.dev>
---
 kernel/bpf/core.c       | 7 -------
 net/bpf/Makefile        | 1 +
 net/bpf/bpf_net_trace.c | 8 ++++++++
 3 files changed, 9 insertions(+), 7 deletions(-)
 create mode 100644 net/bpf/bpf_net_trace.c

diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index ba6b6118cf50..54e570f62606 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -3180,10 +3180,3 @@ late_initcall(bpf_global_ma_init);
 
 DEFINE_STATIC_KEY_FALSE(bpf_stats_enabled_key);
 EXPORT_SYMBOL(bpf_stats_enabled_key);
-
-/* All definitions of tracepoints related to BPF. */
-#define CREATE_TRACE_POINTS
-#include <linux/bpf_trace.h>
-
-EXPORT_TRACEPOINT_SYMBOL_GPL(xdp_exception);
-EXPORT_TRACEPOINT_SYMBOL_GPL(xdp_bulk_tx);
diff --git a/net/bpf/Makefile b/net/bpf/Makefile
index 1ebe270bde23..e95453053159 100644
--- a/net/bpf/Makefile
+++ b/net/bpf/Makefile
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_BPF_SYSCALL)	:= test_run.o
+obj-$(CONFIG_BPF_SYSCALL)	+= bpf_net_trace.o
 ifeq ($(CONFIG_BPF_JIT),y)
 obj-$(CONFIG_BPF_SYSCALL)	+= bpf_dummy_struct_ops.o
 endif
diff --git a/net/bpf/bpf_net_trace.c b/net/bpf/bpf_net_trace.c
new file mode 100644
index 000000000000..e7c0537dbffd
--- /dev/null
+++ b/net/bpf/bpf_net_trace.c
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/* All definitions of net tracepoints related to BPF. */
+#define CREATE_TRACE_POINTS
+#include <linux/bpf_trace.h>
+
+EXPORT_TRACEPOINT_SYMBOL_GPL(xdp_exception);
+EXPORT_TRACEPOINT_SYMBOL_GPL(xdp_bulk_tx);
-- 
2.47.1