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If there is no matched result, check_redundant() will return BFS_RNOMATCH. Signed-off-by: Xiongwei Song <sxwjean@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Boqun Feng <boqun.feng@gmail.com> Link: https://lkml.kernel.org/r/20210618130230.123249-1-sxwjean@me.com