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