linux-kernel - Re: [PATCH 08/30] net: wireless: ath: carl9170: Mark 'ar9170_qmap' as __maybe

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Date:   Mon, 17 Aug 2020 10:26:16 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Christian Lamparter <chunkeey@...il.com>,
        Lee Jones <lee.jones@...aro.org>, davem@...emloft.net,
        kuba@...nel.org
Cc:     linux-kernel@...r.kernel.org,
        Christian Lamparter <chunkeey@...glemail.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Johannes Berg <johannes@...solutions.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 08/30] net: wireless: ath: carl9170: Mark 'ar9170_qmap' as
 __maybe_unused

On 14/08/2020 17.14, Christian Lamparter wrote:
> On 2020-08-14 13:39, Lee Jones wrote:
>> 'ar9170_qmap' is used in some source files which include carl9170.h,
>> but not all of them.  Mark it as __maybe_unused to show that this is
>> not only okay, it's expected.
>>
>> Fixes the following W=1 kernel build warning(s)
> 
> Is this W=1 really a "must" requirement? I find it strange having
> __maybe_unused in header files as this "suggests" that the
> definition is redundant.

In this case it seems one could replace the table lookup with a

static inline u8 ar9170_qmap(u8 idx) { return 3 - idx; }

gcc doesn't warn about unused static inline functions (or one would have
a million warnings to deal with). Just my $0.02.

Rasmus