Re: [RFC net-next v2 3/5] net: phy: nxp-c45-tja11xx add MACsec support

[Andrew Lunn]

> > > > +static bool nxp_c45_rx_sc_valid(struct nxp_c45_secy *phy_secy,
> > > > +				struct macsec_rx_sc *rx_sc)
> > > > +{
> > > > +	u16 port =  (__force u64)rx_sc->sci >> (ETH_ALEN * 8);
> > > 
> > > u64 sci = be64_to_cpu((__force __be64)rx_sc->sci);
> > 
> > why is the __force needed? What happens with a normal cast?
> > 
> 
> Sparse will print warnings if __force is missing.

What is the warning? I just want to make sure __force is the correct
solution, not that something has the wrong type and we should be
fixing a design issue.

       Andrew