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Now that bpf_cgroup_acquire() is KF_RCU | KF_RET_NULL, bpf_cgroup_kptr_get() is redundant. Let's remove it, and update selftests to instead use bpf_cgroup_acquire() where appropriate. The next patch will update the BPF documentation to not mention bpf_cgroup_kptr_get(). Signed-off-by: David Vernet <void@manifault.com> Link: https://lore.kernel.org/r/20230411041633.179404-2-void@manifault.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>