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Compilation on 32-bit ARM fails after commit992aa864dc("mlxsw: spectrum_ptp: Add implementation for physical hardware clock operations") because of 64-bit division: arm-linux-gnueabi-ld: drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.o: in function `mlxsw_sp1_ptp_phc_settime': spectrum_ptp.c:(.text+0x39c): undefined reference to `__aeabi_uldivmod' Fix by using div_u64(). Fixes:992aa864dc("mlxsw: spectrum_ptp: Add implementation for physical hardware clock operations") Signed-off-by: Shalom Toledo <shalomt@mellanox.com> Reviewed-by: Ido Schimmel <idosch@mellanox.com> Reported-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>