From: Dan Carpenter <dan.carpenter@oracle.com>
To: Rajat Asthana <thisisrast7@gmail.com>
Cc: vaibhav.sr@gmail.com, mgreer@animalcreek.com, johan@kernel.org,
elder@kernel.org, gregkh@linuxfoundation.org,
greybus-dev@lists.linaro.org, linux-staging@lists.linux.dev,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] greybus: audio: Fix sparse warning.
Date: Wed, 19 May 2021 13:29:47 +0300 [thread overview]
Message-ID: <20210519102947.GU1955@kadam> (raw)
In-Reply-To: <20210519041624.824757-1-thisisrast7@gmail.com>
On Wed, May 19, 2021 at 09:46:24AM +0530, Rajat Asthana wrote:
> Enforce int type on SNDRV_CTL_ELEM_IFACE_MIXER to fix sparse warning:
> > warning: restricted snd_ctl_elem_iface_t degrades to integer
>
> The iface field in the gb_audio_control struct is of type __u8, but the
> values stored in it are of type int. So on conversion they are degraded.
> Adding (__force int) will enforce them not to be degraded.
>
The patch is fine, but the commit message is not very great. This
patch doesn't "enforce" anything or affect the compiled code at all,
it just silences a Sparse warning. Here is a better commit message.
Sparse complains that:
warning: restricted snd_ctl_elem_iface_t degrades to integer
I have looked at this code, and the code is fine as-is. Normally
we would frown on using the __force directive to silence Sparse
warnings but in this case it's fine. Case statements can't be
made into __bitwise types. We also can't change the type of
"ctl->iface" either because that is part of the user space API.
So just add a (__force int) to make the warning go away.
regards,
dan carpenter
next prev parent reply other threads:[~2021-05-19 10:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-19 4:16 [PATCH] greybus: audio: Fix sparse warning Rajat Asthana
2021-05-19 10:29 ` Dan Carpenter [this message]
2021-05-19 13:41 ` [PATCH v2] " Rajat Asthana
2021-05-19 13:47 ` Dan Carpenter
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=20210519102947.GU1955@kadam \
--to=dan.carpenter@oracle.com \
--cc=elder@kernel.org \
--cc=gregkh@linuxfoundation.org \
--cc=greybus-dev@lists.linaro.org \
--cc=johan@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-staging@lists.linux.dev \
--cc=mgreer@animalcreek.com \
--cc=thisisrast7@gmail.com \
--cc=vaibhav.sr@gmail.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).