linux-kernel - Re: [PATCH] dm ioctl: Remove double parentheses

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Date:   Mon, 3 Apr 2017 09:56:53 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Joe Perches <joe@...ches.com>
Cc:     Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>, dm-devel@...hat.com,
        Shaohua Li <shli@...nel.org>, linux-raid@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Grant Grundler <grundler@...omium.org>,
        Michael Davidson <md@...gle.com>,
        Greg Hackmann <ghackmann@...gle.com>
Subject: Re: [PATCH] dm ioctl: Remove double parentheses

Hi Joe,

El Fri, Mar 31, 2017 at 07:07:33PM -0700 Joe Perches ha dit:

> On Fri, 2017-03-31 at 18:50 -0700, Matthias Kaehlcke wrote:
> > El Thu, Mar 16, 2017 at 09:48:30AM -0700 Matthias Kaehlcke ha dit:
> > 
> > > The extra pair of parantheses is not needed and causes clang to generate
> > > the following warning:
> > > 
> > > drivers/md/dm-ioctl.c:1776:11: error: equality comparison with extraneous parentheses [-Werror,-Wparentheses-equality]
> > >         if ((cmd == DM_DEV_CREATE_CMD)) {
> > >              ~~~~^~~~~~~~~~~~~~~~~~~~
> > > drivers/md/dm-ioctl.c:1776:11: note: remove extraneous parentheses around the comparison to silence this warning
> > >         if ((cmd == DM_DEV_CREATE_CMD)) {
> > >             ~    ^                   ~
> > > drivers/md/dm-ioctl.c:1776:11: note: use '=' to turn this equality comparison into an assignment
> > >         if ((cmd == DM_DEV_CREATE_CMD)) {
> 
> There are dozens of these comparisons in the kernel.
> Are you fixing them all or just this one?

For now I focus on occurrences that pop up in my builds. So far there
have been two more:

https://patchwork.kernel.org/patch/9626833/
https://patchwork.kernel.org/patch/9631591/

Thanks

Matthias