linux-kernel - RE: [PATCH 3/3] [PATCH] staging: greybus: __u8 is sufficient for snd_ctl_elem_type_t and snd_ctl_elem_iface

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Date:   Sat, 26 Sep 2020 10:11:59 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Coiby Xu' <coiby.xu@...il.com>
CC:     "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        Vaibhav Agarwal <vaibhav.sr@...il.com>,
        Mark Greer <mgreer@...malcreek.com>,
        Johan Hovold <johan@...nel.org>, Alex Elder <elder@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        "moderated list:GREYBUS SUBSYSTEM" <greybus-dev@...ts.linaro.org>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:SOUND" <alsa-devel@...a-project.org>
Subject: RE: [PATCH 3/3] [PATCH] staging: greybus: __u8 is sufficient for
 snd_ctl_elem_type_t and snd_ctl_elem_iface_t

From: Coiby Xu
> Sent: 25 September 2020 15:11
> 
> On Thu, Sep 24, 2020 at 10:54:50AM +0000, David Laight wrote:
> >From: Coiby Xu
> >> Sent: 24 September 2020 11:21
> >> Use __8 to replace int and remove the unnecessary __bitwise type attribute.
> >>
> >> Found by sparse,
> >...
> >> 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 */
> >
> >WTF is all that about anyway??
> >What is wrong with:
> >#define	SNDRV_CTL_ELEM_TYPE_NONE	0u /* invalid */
> 
> I'm sorry I don't quite understand you. Are you suggesting SNDRV_CTL_ELEM_TYPE_NONE
> isn't needed in the first place?

No, just remove all the casts from the constants.
Are the types even used anywhere else?

	David

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