bpf: Clarify bpf_arena comments.
Clarify two bpf_arena comments, use existing SZ_4G #define, improve page_cnt check. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Stanislav Fomichev <sdf@google.com> Link: https://lore.kernel.org/bpf/20240315021834.62988-2-alexei.starovoitov@gmail.com
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