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Miller" , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org > >All the horrible casts go away, the driver is structured like every > >other driver, sparse is probably happy, etc. > > > > This looks more like a matter cosmetic preferences. I mean, I didn't > notice anything "horrible" in the code so far. #define bus_to_enetc_regs(bus) (struct enetc_mdio_regs __iomem *)((bus)->priv) You should not need a cast here, bus->priv is a void *. But bus->priv is being abused to hold a __iomem pointer. enetc_wr_reg(®s->mdio_cfg, mdio_cfg); This is also rather odd, passing the address of something to an IO operator? I also don't know the C standard well enough to know if it is guaranteed that: struct enetc_mdio_regs { u32 mdio_cfg; /* MDIO configuration and status */ u32 mdio_ctl; /* MDIO control */ u32 mdio_data; /* MDIO data */ u32 mdio_addr; /* MDIO address */ }; actually works. On a 64bit system is the compiler allowed to put in padding to keep the u32 64 bit aligned? > I actually find it more > ugly to define a new structure with only one element inside, like: > struct enetc_mdio_priv { > struct enetc_hw *hw; > } One advantage of this is that struct enetc_hw correctly has all the __iomem attributes. All the casts to __iomem go away, and sparse is happy. > Anyway, if others already did this in the kernel, what can I do? Clean it up. Make the code more readable and easy to maintain. Andrew _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel