Re: [PATCH] net: mdio-octeon: Fix pointer/integer casts

[Olof Johansson <olof@lixom.net>]

On Sun, Nov 10, 2019 at 6:32 PM Andrew Lunn <andrew@lunn.ch> wrote:
>
> On Sun, Nov 10, 2019 at 04:42:11PM -0800, Olof Johansson wrote:
> > Fixes a bunch of these warnings on arm allmodconfig:
> >
> > In file included from /build/drivers/net/phy/mdio-cavium.c:11:
> > /build/drivers/net/phy/mdio-cavium.c: In function 'cavium_mdiobus_set_mode':
> > /build/drivers/net/phy/mdio-cavium.h:114:37: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
> >   114 | #define oct_mdio_readq(addr)  readq((void *)addr)
> >       |                                     ^
> > /build/drivers/net/phy/mdio-cavium.c:21:16: note: in expansion of macro 'oct_mdio_readq'
> >    21 |  smi_clk.u64 = oct_mdio_readq(p->register_base + SMI_CLK);
> >       |                ^~~~~~~~~~~~~~
> >
> > Fixes: 171a9bae68c7 ("staging/octeon: Allow test build on !MIPS")
> > Signed-off-by: Olof Johansson <olof@lixom.net>
> > ---
> >  drivers/net/phy/mdio-cavium.h  | 14 +++++++-------
> >  drivers/net/phy/mdio-octeon.c  |  5 ++---
> >  drivers/net/phy/mdio-thunder.c |  2 +-
> >  3 files changed, 10 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/net/phy/mdio-cavium.h b/drivers/net/phy/mdio-cavium.h
> > index b7f89ad27465f..1cf81f0bc585f 100644
> > --- a/drivers/net/phy/mdio-cavium.h
> > +++ b/drivers/net/phy/mdio-cavium.h
> > @@ -90,7 +90,7 @@ union cvmx_smix_wr_dat {
> >
> >  struct cavium_mdiobus {
> >       struct mii_bus *mii_bus;
> > -     u64 register_base;
> > +     void __iomem *register_base;
> >       enum cavium_mdiobus_mode mode;
> >  };
> >
> > @@ -98,20 +98,20 @@ struct cavium_mdiobus {
> >
> >  #include <asm/octeon/octeon.h>
> >
> > -static inline void oct_mdio_writeq(u64 val, u64 addr)
> > +static inline void oct_mdio_writeq(u64 val, void __iomem *addr)
> >  {
> > -     cvmx_write_csr(addr, val);
> > +     cvmx_write_csr((u64)addr, val);
> >  }
>
> Hi Olof
>
> Humm. The warning goes away, but is it really any better?
>
> Did you try also changing the stub function in
> drivers/staging/octeon/octeon-stubs.h so it takes void __iomem?  Or
> did that cause a lot more warnings from other places?

That percolates through a bunch of MIPS code that I didn't feel like
getting into. So indeed, I stopped at that point.


-Olof