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Date:   Mon, 11 Nov 2019 03:32:55 +0100
From:   Andrew Lunn <andrew@lunn.ch>
To:     Olof Johansson <olof@lixom.net>
Cc:     Florian Fainelli <f.fainelli@gmail.com>,
        Heiner Kallweit <hkallweit1@gmail.com>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        "David S . Miller" <davem@davemloft.net>
Subject: Re: [PATCH] net: mdio-octeon: Fix pointer/integer casts
Message-ID: <20191111023255.GY25889@lunn.ch>
References: <20191111004211.96425-1-olof@lixom.net>
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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?

Thanks
     Andrew