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SubjectRe: [greybus-dev] [PATCH 3/3] [PATCH] staging: greybus: __u8 is sufficient for snd_ctl_elem_type_t and snd_ctl_elem_iface_t
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On 9/24/20 5:20 AM, Coiby Xu wrote:
> Use __8 to replace int and remove the unnecessary __bitwise type attribute.
>
> Found by sparse,

Greg's right, don't change the public header.

You could try this in the Greybus code to eliminate the warning,
but I haven't tried it (and for all I know it's not a good idea):

uinfo->type = (__force snd_ctl_elem_type_t)info->type;

-Alex

> $ make C=2 drivers/staging/greybus/
> drivers/staging/greybus/audio_topology.c:185:24: warning: cast to restricted snd_ctl_elem_type_t
> drivers/staging/greybus/audio_topology.c:679:14: warning: restricted snd_ctl_elem_iface_t degrades to integer
> drivers/staging/greybus/audio_topology.c:906:14: warning: restricted snd_ctl_elem_iface_t degrades to integer
>
> Signed-off-by: Coiby Xu <coiby.xu@gmail.com>
> ---
> drivers/staging/greybus/audio_topology.c | 2 +-
> include/uapi/sound/asound.h | 4 ++--
> 2 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c
> index 56bf1a4f95ad..f6023ff390c2 100644
> --- a/drivers/staging/greybus/audio_topology.c
> +++ b/drivers/staging/greybus/audio_topology.c
> @@ -182,7 +182,7 @@ static int gbcodec_mixer_ctl_info(struct snd_kcontrol *kcontrol,
> /* update uinfo */
> uinfo->access = data->access;
> uinfo->count = data->vcount;
> - uinfo->type = (snd_ctl_elem_type_t)info->type;
> + uinfo->type = info->type;
>
> switch (info->type) {
> case GB_AUDIO_CTL_ELEM_TYPE_BOOLEAN:
> diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h
> index 535a7229e1d9..8e71a95644ab 100644
> --- a/include/uapi/sound/asound.h
> +++ b/include/uapi/sound/asound.h
> @@ -950,7 +950,7 @@ struct snd_ctl_card_info {
> unsigned char components[128]; /* card components / fine identification, delimited with one space (AC97 etc..) */
> };
>
> -typedef int __bitwise snd_ctl_elem_type_t;
> +typedef __u8 snd_ctl_elem_type_t;
> #define SNDRV_CTL_ELEM_TYPE_NONE ((__force snd_ctl_elem_type_t) 0) /* invalid */
> #define SNDRV_CTL_ELEM_TYPE_BOOLEAN ((__force snd_ctl_elem_type_t) 1) /* boolean type */
> #define SNDRV_CTL_ELEM_TYPE_INTEGER ((__force snd_ctl_elem_type_t) 2) /* integer type */
> @@ -960,7 +960,7 @@ typedef int __bitwise snd_ctl_elem_type_t;
> #define SNDRV_CTL_ELEM_TYPE_INTEGER64 ((__force snd_ctl_elem_type_t) 6) /* 64-bit integer type */
> #define SNDRV_CTL_ELEM_TYPE_LAST SNDRV_CTL_ELEM_TYPE_INTEGER64
>
> -typedef int __bitwise snd_ctl_elem_iface_t;
> +typedef __u8 snd_ctl_elem_iface_t;
> #define SNDRV_CTL_ELEM_IFACE_CARD ((__force snd_ctl_elem_iface_t) 0) /* global control */
> #define SNDRV_CTL_ELEM_IFACE_HWDEP ((__force snd_ctl_elem_iface_t) 1) /* hardware dependent device */
> #define SNDRV_CTL_ELEM_IFACE_MIXER ((__force snd_ctl_elem_iface_t) 2) /* virtual mixer device */
>

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