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The output goes like this if I make samples/bpf: ...warning: no previous prototype for ‘get_cgroup_id_from_path’... Make this function static could solve the warning problem since no one outside of the file calls it. Signed-off-by: Jason Xing <kernelxing@tencent.com> Acked-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/r/20240406144613.4434-1-kerneljasonxing@gmail.com Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>