From: Alex Elder <elder@linaro.org>
To: Coiby Xu <coiby.xu@gmail.com>, devel@driverdev.osuosl.org
Cc: "moderated list:SOUND" <alsa-devel@alsa-project.org>,
Alex Elder <elder@kernel.org>, Takashi Iwai <tiwai@suse.com>,
Johan Hovold <johan@kernel.org>, Jaroslav Kysela <perex@perex.cz>,
"moderated list:GREYBUS SUBSYSTEM" <greybus-dev@lists.linaro.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [greybus-dev] [PATCH 3/3] [PATCH] staging: greybus: __u8 is sufficient for snd_ctl_elem_type_t and snd_ctl_elem_iface_t
Date: Thu, 24 Sep 2020 08:01:09 -0500 [thread overview]
Message-ID: <772d78de-630f-4b0f-16cc-4e67b8f98907@linaro.org> (raw)
In-Reply-To: <20200924102039.43895-3-coiby.xu@gmail.com>
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 */
>
next prev parent reply other threads:[~2020-09-24 13:01 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-24 10:20 [PATCH 1/3] [PATCH] staging: greybus: fix warnings about endianness detected by sparse Coiby Xu
2020-09-24 10:20 ` [PATCH 2/3] staging: greybus: codecs: use SNDRV_PCM_FMTBIT_S16_LE for format bitmask Coiby Xu
2020-09-24 12:54 ` [greybus-dev] " Alex Elder
2020-09-24 10:20 ` [PATCH 3/3] [PATCH] staging: greybus: __u8 is sufficient for snd_ctl_elem_type_t and snd_ctl_elem_iface_t Coiby Xu
2020-09-24 10:54 ` David Laight
2020-09-25 14:11 ` Coiby Xu
2020-09-25 16:02 ` [greybus-dev] " Alex Elder
2020-09-26 4:01 ` Coiby Xu
2020-09-26 10:11 ` David Laight
2020-09-24 11:00 ` Greg Kroah-Hartman
2020-09-25 14:07 ` Coiby Xu
2020-09-25 15:57 ` Alex Elder
2020-09-26 5:09 ` Coiby Xu
2020-09-24 13:01 ` Alex Elder [this message]
2020-09-24 12:50 ` [greybus-dev] [PATCH 1/3] [PATCH] staging: greybus: fix warnings about endianness detected by sparse Alex Elder
2020-09-25 14:09 ` Coiby Xu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=772d78de-630f-4b0f-16cc-4e67b8f98907@linaro.org \
--to=elder@linaro.org \
--cc=alsa-devel@alsa-project.org \
--cc=coiby.xu@gmail.com \
--cc=devel@driverdev.osuosl.org \
--cc=elder@kernel.org \
--cc=greybus-dev@lists.linaro.org \
--cc=johan@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=perex@perex.cz \
--cc=tiwai@suse.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).