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bpf: Make bpf_cgroup_acquire() KF_RCU | KF_RET_NULL

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struct cgroup is already an RCU-safe type in the verifier. We can
therefore update bpf_cgroup_acquire() to be KF_RCU | KF_RET_NULL, and
subsequently remove bpf_cgroup_kptr_get(). This patch does the first of
these by updating bpf_cgroup_acquire() to be KF_RCU | KF_RET_NULL, and
also updates selftests accordingly.

Signed-off-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20230411041633.179404-1-void@manifault.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
David Vernet
2023-04-10 23:16:31 -05:00
committed by Alexei Starovoitov
parent 10fd5f70c3
commit 1d71283987
4 changed files with 40 additions and 10 deletions
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5
tools/testing/selftests/bpf/progs/cgrp_kfunc_common.h
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@@ -61,6 +61,11 @@ static inline int cgrps_kfunc_map_insert(struct cgroup *cgrp)
}
acquired = bpf_cgroup_acquire(cgrp);
if (!acquired) {
bpf_map_delete_elem(&__cgrps_kfunc_map, &id);
return -ENOENT;
}
old = bpf_kptr_xchg(&v->cgrp, acquired);
if (old) {
bpf_cgroup_release(old);