diff options
Diffstat (limited to 'Documentation/bpf')
| -rw-r--r-- | Documentation/bpf/kfuncs.rst | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/Documentation/bpf/kfuncs.rst b/Documentation/bpf/kfuncs.rst index ca96ef3f6896..226313747be5 100644 --- a/Documentation/bpf/kfuncs.rst +++ b/Documentation/bpf/kfuncs.rst @@ -583,13 +583,17 @@ Here's an example of how it can be used: ---- -Another kfunc available for interacting with ``struct cgroup *`` objects is -bpf_cgroup_ancestor(). This allows callers to access the ancestor of a cgroup, -and return it as a cgroup kptr. +Other kfuncs available for interacting with ``struct cgroup *`` objects are +bpf_cgroup_ancestor() and bpf_cgroup_from_id(), allowing callers to access +the ancestor of a cgroup and find a cgroup by its ID, respectively. Both +return a cgroup kptr. .. kernel-doc:: kernel/bpf/helpers.c :identifiers: bpf_cgroup_ancestor +.. kernel-doc:: kernel/bpf/helpers.c + :identifiers: bpf_cgroup_from_id + Eventually, BPF should be updated to allow this to happen with a normal memory load in the program itself. This is currently not possible without more work in the verifier. bpf_cgroup_ancestor() can be used as follows: |