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Sun, 29 Mar 2026 07:05:31 -0700 (PDT) From: Chengkaitao To: martin.lau@linux.dev, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, 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, linux-kselftest@vger.kernel.org Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf-next v9 2/9] bpf: refactor __bpf_list_del to take list node pointer Date: Sun, 29 Mar 2026 22:04:59 +0800 Message-ID: <20260329140506.9595-3-pilgrimtao@gmail.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260329140506.9595-1-pilgrimtao@gmail.com> References: <20260329140506.9595-1-pilgrimtao@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Kaitao Cheng Refactor __bpf_list_del to accept (head, struct list_head *n) instead of (head, bool tail). The caller now passes the specific node to remove: bpf_list_pop_front passes h->next, bpf_list_pop_back passes h->prev. Prepares for introducing bpf_list_del(head, node) kfunc to remove an arbitrary node when the user holds ownership. Signed-off-by: Kaitao Cheng --- kernel/bpf/helpers.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c index cb6d242bd093..94fcd4ab39e9 100644 --- a/kernel/bpf/helpers.c +++ b/kernel/bpf/helpers.c @@ -2426,22 +2426,25 @@ __bpf_kfunc int bpf_list_push_back_impl(struct bpf_= list_head *head, return __bpf_list_add(n, head, true, meta ? meta->record : NULL, off); } =20 -static struct bpf_list_node *__bpf_list_del(struct bpf_list_head *head, bo= ol tail) +static struct bpf_list_node *__bpf_list_del(struct bpf_list_head *head, + struct list_head *n) { - struct list_head *n, *h =3D (void *)head; + struct list_head *h =3D (void *)head; struct bpf_list_node_kern *node; =20 /* If list_head was 0-initialized by map, bpf_obj_init_field wasn't * called on its fields, so init here */ - if (unlikely(!h->next)) + if (unlikely(!h->next)) { INIT_LIST_HEAD(h); + return NULL; + } + if (list_empty(h)) return NULL; =20 - n =3D tail ? h->prev : h->next; node =3D container_of(n, struct bpf_list_node_kern, list_head); - if (WARN_ON_ONCE(READ_ONCE(node->owner) !=3D head)) + if (unlikely(READ_ONCE(node->owner) !=3D head)) return NULL; =20 list_del_init(n); @@ -2451,12 +2454,16 @@ static struct bpf_list_node *__bpf_list_del(struct = bpf_list_head *head, bool tai =20 __bpf_kfunc struct bpf_list_node *bpf_list_pop_front(struct bpf_list_head = *head) { - return __bpf_list_del(head, false); + struct list_head *h =3D (void *)head; + + return __bpf_list_del(head, h->next); } =20 __bpf_kfunc struct bpf_list_node *bpf_list_pop_back(struct bpf_list_head *= head) { - return __bpf_list_del(head, true); + struct list_head *h =3D (void *)head; + + return __bpf_list_del(head, h->prev); } =20 __bpf_kfunc struct bpf_list_node *bpf_list_front(struct bpf_list_head *hea= d) --=20 2.50.1 (Apple Git-155)