netdev - Re: [PATCH v2] mac80211: Fix clang warning about constant operand in logical operation

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Date:   Thu, 13 Apr 2017 08:27:30 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Matthias Kaehlcke <mka@...omium.org>,
        "David S . Miller" <davem@...emloft.net>
Cc:     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 v2] mac80211: Fix clang warning about constant operand
 in logical operation

On Thu, 2017-04-06 at 16:31 -0700, Matthias Kaehlcke wrote:
> When clang detects a non-boolean constant in a logical operation it
> generates a 'constant-logical-operand' warning. In
> ieee80211_try_rate_control_ops_get() the result of strlen(<const
> str>)
> is used in a logical operation, clang resolves the expression to an
> (integer) constant at compile time when clang's builtin strlen
> function
> is used.
> 
> Change the condition to check for strlen() > 0 to make the constant
> operand boolean and thus avoid the warning.
> 
Applied.

johannes