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do_div() does a 64-by-32 division. When the divisor is u64, do_div() truncates it to 32 bits, this means it can test non-zero and be truncated to zero for division. fix do_div.cocci warning: do_div() does a 64-by-32 division, please consider using div64_u64 instead. Signed-off-by: Wang Qing <wangqing@vivo.com> Signed-off-by: David S. Miller <davem@davemloft.net>