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

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Message-ID: <1491519117.11399.10.camel@sipsolutions.net>
Date:   Fri, 07 Apr 2017 00:51:57 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Matthias Kaehlcke <mka@...omium.org>
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

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.

johannes