linux-kernel - [PATCH bpf-next] bpftool: Add SPDX identifier to btf-dump-file output

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Message-Id: <1d2931e80c03f4d3f7263beaf8f19a4867e9fe32.1647212431.git.dxu@dxuuu.xyz>
Date:   Sun, 13 Mar 2022 16:01:26 -0700
From:   Daniel Xu <dxu@...uu.xyz>
To:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org
Cc:     Daniel Xu <dxu@...uu.xyz>, linux-kernel@...r.kernel.org
Subject: [PATCH bpf-next] bpftool: Add SPDX identifier to btf-dump-file output

A concern about potential GPL violations came up at the new $DAYJOB when
I tried to vendor the vmlinux.h output. The central point was that the
generated vmlinux.h does not embed a license string -- making the
licensing of the file non-obvious.

This commit adds a LGPL-2.1 OR BSD-2-Clause SPDX license identifier to
the generated vmlinux.h output. This is line with what bpftool generates
in object file skeletons.

Signed-off-by: Daniel Xu <dxu@...uu.xyz>
---
 tools/bpf/bpftool/btf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/bpf/bpftool/btf.c b/tools/bpf/bpftool/btf.c
index a2c665beda87..fca810a27768 100644
--- a/tools/bpf/bpftool/btf.c
+++ b/tools/bpf/bpftool/btf.c
@@ -425,6 +425,7 @@ static int dump_btf_c(const struct btf *btf,
 	if (err)
 		return err;

+	printf("/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */\n\n");
 	printf("#ifndef __VMLINUX_H__\n");
 	printf("#define __VMLINUX_H__\n");
 	printf("\n");
-- 
2.35.1