linux-kernel - Re: [PATCH] mac80211: Fix clang warning about constant operand in logical operation

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Date:   Thu, 6 Apr 2017 16:07:26 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     "David S . Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, Grant Grundler <grundler@...omium.org>,
        Michael Davidson <md@...gle.com>,
        Greg Hackmann <ghackmann@...gle.com>
Subject: Re: [PATCH] mac80211: Fix clang warning about constant operand in
 logical operation

El Fri, Apr 07, 2017 at 12:51:57AM +0200 Johannes Berg ha dit:

> On Thu, 2017-04-06 at 15:42 -0700, Matthias Kaehlcke wrote:
> > 
> > Thanks, it would also require to move the initialization of
> > ieee80211_default_rc_algo into an ifdef. If you can live with such a
> > solution I'm happy to change it.
> 
> I think that'd be something I can live with, yeah.
> 
> > > 	git grep 'IS_ENABLED(' | grep '&&'
> > 
> > Indeed the warning is not triggered by these constructs. It seems
> > clang only emits the warning when the constant operand is not
> > boolean.
> 
> That points to just adding "> 0" to the condition here as another
> alternative solution, I guess? With a comment to make sure it's not
> removed again, that'd seem like the best thing to do.

Good point, that's more digestible. I'll send an updated change soon.

Matthias