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Verify these two cases: 1. Direct reading the data of read-only percpu data's percpu_array map is allowed. 2. Direct writing the data of read-only percpu data's percpu_array map is disallowed. Assisted-by: Codex:gpt-5.5-xhigh Signed-off-by: Leon Hwang <leon.hwang@linux.dev> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20260813152324.97937-9-leon.hwang@linux.dev