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Due to an incomplete API set, only FIFO or LIFO operations are supported. The patches enhance the BPF list API, making it more list-like. Four new kfuncs have been added: bpf_list_del: remove a node from the list bpf_list_add_impl: insert a node after a given list node bpf_list_node_is_edge: check if a node is the first or last in the list bpf_list_empty: check if the list is empty refactor kfunc checks to table-driven approach, and add test cases for the aforementioned kfuncs. Changes in v6: - Merge [patch v5 (2,4,6)/6] into [patch v6 4/5] - If list_head was 0-initialized, init it - refactor kfunc checks to table-driven approach Changes in v5: - Fix bpf_obj leak on bpf_list_add_impl error Changes in v4: - [patch v3 1/6] Revert to version v1 - Change the parameters of bpf_list_add_impl to (head, new, prev, ...) Changes in v3: - Add a new lock_rec member to struct bpf_reference_state for lock holding detection. - Add test cases to verify that the verifier correctly restricts calls to bpf_list_del when the spin_lock is not held. Changes in v2: - Remove the head parameter from bpf_list_del - Add bpf_list_add/is_first/is_last/empty to API and test cases Link to v5: https://lore.kernel.org/all/20260304031606.43884-1-pilgrimtao@gmail.com/ Link to v4: https://lore.kernel.org/all/20260303135219.33726-1-pilgrimtao@gmail.com/ Link to v3: https://lore.kernel.org/all/20260302124028.82420-1-pilgrimtao@gmail.com/ Link to v2: https://lore.kernel.org/all/20260225092651.94689-1-pilgrimtao@gmail.com/ Link to v1: https://lore.kernel.org/all/20260209025250.55750-1-pilgrimtao@gmail.com/ Kaitao Cheng (5): bpf: Introduce the bpf_list_del kfunc. bpf: Add bpf_list_add_impl to insert node after a given list node bpf: Add bpf_list_is_edge/empty kfuncs selftests/bpf: Add test cases for bpf_list_del/add/is_edge/empty bpf/verifier: refactor kfunc checks to table-driven approach kernel/bpf/helpers.c | 98 ++++++++++ kernel/bpf/verifier.c | 103 +++++++--- .../testing/selftests/bpf/bpf_experimental.h | 39 ++++ .../selftests/bpf/progs/refcounted_kptr.c | 182 ++++++++++++++++++ 4 files changed, 398 insertions(+), 24 deletions(-) -- 2.50.1 (Apple Git-155)