linux-kernel - Re: [PATCH -next v5 10/23] iio: imu: smi330: #undef field

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Message-ID: <20251102104326.0f1db96a@jic23-huawei>
Date: Sun, 2 Nov 2025 10:43:26 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Geert Uytterhoeven <geert+renesas@...der.be>
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Subject: Re: [PATCH -next v5 10/23] iio: imu: smi330: #undef
 field_{get,prep}() before definition

On Mon, 27 Oct 2025 19:41:44 +0100
Geert Uytterhoeven <geert+renesas@...der.be> wrote:

> Prepare for the advent of globally available common field_get() and
> field_prep() macros by undefining the symbols before defining local
> variants.  This prevents redefinition warnings from the C preprocessor
> when introducing the common macros later.
> 
> Suggested-by: Yury Norov <yury.norov@...il.com>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>

So this is going to make a mess of merging your series given this is
queued up for next merge window.

I can pick this one up perhaps and we loop back to the replacement of
these in a future patch?  Or perhaps go instead with a rename
of these two which is probably nicer in the intermediate state than
undefs.

> --
> v5:
>   - New.
> ---
>  drivers/iio/imu/smi330/smi330_core.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/iio/imu/smi330/smi330_core.c b/drivers/iio/imu/smi330/smi330_core.c
> index d9178725ade3da83..a79964fe68fadf47 100644
> --- a/drivers/iio/imu/smi330/smi330_core.c
> +++ b/drivers/iio/imu/smi330/smi330_core.c
> @@ -68,7 +68,9 @@
>  #define SMI330_SOFT_RESET_DELAY 2000
>  
>  /* Non-constant mask variant of FIELD_GET() and FIELD_PREP() */
> +#undef field_get
>  #define field_get(_mask, _reg) (((_reg) & (_mask)) >> (ffs(_mask) - 1))
> +#undef field_prep
>  #define field_prep(_mask, _val) (((_val) << (ffs(_mask) - 1)) & (_mask))
>  
>  #define SMI330_ACCEL_CHANNEL(_axis) {					\