bpf: extend bpf_prog_array to store pointers to the cgroup storage
This patch converts bpf_prog_array from an array of prog pointers to the array of struct bpf_prog_array_item elements. This allows to save a cgroup storage pointer for each bpf program efficiently attached to a cgroup. Signed-off-by: NRoman Gushchin <guro@fb.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Acked-by: NMartin KaFai Lau <kafai@fb.com> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
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