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([2620:10d:c090:500::2:8a9]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-30294adddaasm761840eec.13.2026.05.13.15.32.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 May 2026 15:32:59 -0700 (PDT) Message-ID: Subject: Re: [PATCH RESEND bpf-next v10 3/8] bpf: Introduce the bpf_list_del kfunc. From: Eduard Zingerman To: Kaitao cheng , ast@kernel.org, corbet@lwn.net, martin.lau@linux.dev, daniel@iogearbox.net, andrii@kernel.org, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, shuah@kernel.org, chengkaitao@kylinos.cn, skhan@linuxfoundation.org, memxor@gmail.com Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, vmalik@redhat.com, linux-kselftest@vger.kernel.org Date: Wed, 13 May 2026 15:32:57 -0700 In-Reply-To: <20260512055919.95716-4-kaitao.cheng@linux.dev> References: <20260512055919.95716-1-kaitao.cheng@linux.dev> <20260512055919.95716-4-kaitao.cheng@linux.dev> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.3 (3.58.3-1.fc43) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2026-05-12 at 13:59 +0800, Kaitao cheng wrote: > From: Kaitao Cheng >=20 > Allow users to remove any node from a linked list. >=20 > We have added an additional parameter bpf_list_head *head to > bpf_list_del, as the verifier requires the head parameter to > check whether the lock is being held. >=20 > Signed-off-by: Kaitao Cheng > --- Reviewed-by: Eduard Zingerman [...] > @@ -11456,7 +11459,8 @@ static bool check_kfunc_is_graph_node_api(struct = bpf_verifier_env *env, > =20 > switch (node_field_type) { > case BPF_LIST_NODE: > - ret =3D is_bpf_list_push_kfunc(kfunc_btf_id); > + ret =3D is_bpf_list_push_kfunc(kfunc_btf_id) || > + kfunc_btf_id =3D=3D special_kfunc_list[KF_bpf_list_del]; Nit: to keep everything in the same style, maybe add a is_bpf_list_del_kfun= c() helper? > break; > case BPF_RB_NODE: > ret =3D (is_bpf_rbtree_add_kfunc(kfunc_btf_id) ||