linux-kernel - [PATCH bpf 0/2] use rqspinlock for bpf lru map

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Message-ID: <20251030030010.95352-1-dongml2@chinatelecom.cn>
Date: Thu, 30 Oct 2025 11:00:08 +0800
From: Menglong Dong <menglong8.dong@...il.com>
To: martin.lau@...ux.dev,
	leon.hwang@...ux.dev
Cc: ast@...nel.org,
	daniel@...earbox.net,
	andrii@...nel.org,
	eddyz87@...il.com,
	song@...nel.org,
	yonghong.song@...ux.dev,
	john.fastabend@...il.com,
	kpsingh@...nel.org,
	sdf@...ichev.me,
	haoluo@...gle.com,
	jolsa@...nel.org,
	shuah@...nel.org,
	jiang.biao@...ux.dev,
	linux-kernel@...r.kernel.org,
	bpf@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH bpf 0/2] use rqspinlock for bpf lru map

Convert the raw_spinlock to rqspinlock to fix the possible deadlock in
[1] for bpf lru map. Meanwhile, add the testcase for the deadlock.

Link: https://lore.kernel.org/bpf/CAEf4BzbTJCUx0D=zjx6+5m5iiGhwLzaP94hnw36ZMDHAf4-U_w@mail.gmail.com/[1]
Menglong Dong (2):
  bpf: use rqspinlock for lru map
  selftests/bpf: test map deadlock caused by NMI

 kernel/bpf/bpf_lru_list.c                     |  47 +++---
 kernel/bpf/bpf_lru_list.h                     |   5 +-
 .../selftests/bpf/prog_tests/map_deadlock.c   | 134 ++++++++++++++++++
 .../selftests/bpf/progs/map_deadlock.c        |  52 +++++++
 4 files changed, 217 insertions(+), 21 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/map_deadlock.c
 create mode 100644 tools/testing/selftests/bpf/progs/map_deadlock.c

-- 
2.51.2