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It's possible that writer and the reader can manipulate the same sysctl knob concurrently. Using READ_ONCE() to prevent reading an old value. Signed-off-by: Jason Xing <kernelxing@tencent.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>