linux-kernel - [PATCH v2 0/2] bpf: fix reuse of DEVMAP

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Message-ID: <20250813200912.3523279-1-yuka@yuka.dev>
Date: Wed, 13 Aug 2025 22:09:09 +0200
From: Yureka Lilian <yuka@...a.dev>
To: Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	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>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>
Cc: Yureka Lilian <yuka@...a.dev>,
	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/2] bpf: fix reuse of DEVMAP

This patch series includes the previous fix to libbpf for re-using DEVMAP
maps, but modifies it to preserve compatibility with older kernels, thanks
to the feedback given by Martin KaFai Lau.

Additionally adds a basic selftest covering the re-use of DEVMAP maps, as
requested by Eduard Zingerman.


Yureka Lilian (2):
  bpf: fix reuse of DEVMAP
  bpf: add test for DEVMAP reuse

 tools/lib/bpf/libbpf.c                        | 14 +++-
 .../bpf/prog_tests/pinning_devmap_reuse.c     | 68 +++++++++++++++++++
 .../selftests/bpf/progs/test_pinning_devmap.c | 20 ++++++
 3 files changed, 101 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/pinning_devmap_reuse.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_pinning_devmap.c

-- 
2.50.1