[PATCH bpf-next v2 05/15] bpf: Replace prog_list_prog() check with direct pl->prog and pl->link check
From: Amery Hung <hidden>
Date: 2026-06-23 17:50:16
Also in:
bpf
Subsystem:
bpf [general] (safe dynamic programs and tools), the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds
From: Martin KaFai Lau <martin.lau@kernel.org> prog_list_length() and compute_effective_progs() use !prog_list_prog(pl) to skip a 'detaching' pl. When pl->link is not NULL, prog_list_prog(pl) returns the pl->link->link.prog. This does not work for the upcoming struct_ops patch where pl->link is not NULL but pl->link->link.prog is NULL, because a struct_ops map is attached to the cgroup instead of a BPF prog. To prepare for the upcoming struct_ops patch, this patch replaces the prog_list_prog() test with the "!pl->prog && !pl->link". In __cgroup_bpf_detach(), both pl->prog and pl->link are set to NULL, so testing "!pl->prog && !pl->link" is the same test to tell if a pl is being detached. This change should be a no-op. Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Signed-off-by: Amery Hung <redacted> --- kernel/bpf/cgroup.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index b64f6757096c..b100c04cb9c8 100644
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c@@ -408,7 +408,7 @@ static u32 prog_list_length(struct hlist_head *head, int *preorder_cnt) u32 cnt = 0; hlist_for_each_entry(pl, head, node) { - if (!prog_list_prog(pl)) + if (!pl->prog && !pl->link) continue; if (preorder_cnt && (pl->flags & BPF_F_PREORDER)) (*preorder_cnt)++;
@@ -482,7 +482,7 @@ static int compute_effective_progs(struct cgroup *cgrp, init_bstart = bstart; hlist_for_each_entry(pl, &p->bpf.progs[atype], node) { - if (!prog_list_prog(pl)) + if (!pl->prog && !pl->link) continue; if (pl->flags & BPF_F_PREORDER) {
--
2.53.0-Meta