linux-kernel - Re: [PATCH v5 09/23] ALSA: usb-audio: #undef field

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Message-ID: <87o6prf1i9.wl-tiwai@suse.de>
Date: Tue, 28 Oct 2025 17:13:18 +0100
From: Takashi Iwai <tiwai@...e.de>
To: Geert Uytterhoeven <geert+renesas@...der.be>
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Subject: Re: [PATCH v5 09/23] ALSA: usb-audio: #undef field_{get,prep}() before local definition

On Mon, 27 Oct 2025 19:41:43 +0100,
Geert Uytterhoeven 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>
> --
> v5:
>   - New.
> ---
>  sound/usb/mixer_quirks.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
> index 828af3095b86ee0a..713a8498b975e1ac 100644
> --- a/sound/usb/mixer_quirks.c
> +++ b/sound/usb/mixer_quirks.c
> @@ -3312,7 +3312,9 @@ static int snd_bbfpro_controls_create(struct usb_mixer_interface *mixer)
>  #define RME_DIGIFACE_INVERT BIT(31)
>  
>  /* Nonconst helpers */
> +#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))
>  
>  static int snd_rme_digiface_write_reg(struct snd_kcontrol *kcontrol, int item, u16 mask, u16 val)

Acked-by: Takashi Iwai <tiwai@...e.de>


thanks,

Takashi