Re: [PATCH 2/4] i2c: rcar: optimize cacheline to minimize HW race condition

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Hi Wolfram,

On Wed, Dec 23, 2020 at 6:22 PM Wolfram Sang
<wsa+renesas@xxxxxxxxxxxxxxxxxxxx> wrote:
> 'flags' and 'io' are needed first, so they should be at the beginning of
> the private struct.
>
> Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>

> --- a/drivers/i2c/busses/i2c-rcar.c
> +++ b/drivers/i2c/busses/i2c-rcar.c
> @@ -119,6 +119,7 @@ enum rcar_i2c_type {
>  };
>
>  struct rcar_i2c_priv {
> +       u32 flags;

Note that this adds a hole on 64-bit.

But if this really can make a difference, IMHO it is still broken

>         void __iomem *io;
>         struct i2c_adapter adap;
>         struct i2c_msg *msg;

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds



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