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The new bpf_cpumask_weight() kfunc can be used to count the number of bits that are set in a struct cpumask* kptr. Let's add a selftest to verify its behavior. Signed-off-by: David Vernet <void@manifault.com> Acked-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/r/20231207210843.168466-3-void@manifault.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>