netdev - Re: [PATCH] ath9k: remove set but not used variable 'acq'

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Date:   Mon, 25 Feb 2019 12:59:26 +0200
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     YueHaibing <yuehaibing@...wei.com>,
        QCA ath9k Development <ath9k-devel@....qualcomm.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] ath9k: remove set but not used variable 'acq'

Toke Høiland-Jørgensen <toke@...hat.com> writes:

> Kalle Valo <kvalo@...eaurora.org> writes:
>
>> Toke Høiland-Jørgensen <toke@...hat.com> writes:
>>
>>> YueHaibing <yuehaibing@...wei.com> writes:
>>>
>>>> Fixes gcc '-Wunused-but-set-variable' warning:
>>>>
>>>> drivers/net/wireless/ath/ath9k/recv.c: In function 'ath_rx_count_airtime':
>>>> drivers/net/wireless/ath/ath9k/recv.c:1010:18: warning:
>>>>  variable 'acq' set but not used [-Wunused-but-set-variable]
>>>>
>>>> It's not used after 89cea7493a34 ("ath9k: Switch to mac80211 TXQ scheduling
>>>> and airtime APIs"). Also remove related variables.
>>>
>>> Ah, right, seems I forgot to clean that up. I wonder why I didn't get a
>>> compiler warning for it.
>>
>> I think the warning is not enabled by default and you need to use W=1
>> Makefile variable to enable it.
>
> Hmm, right, thanks! Guess I should get into the habit of compiling with
> warnings enabled before submitting patches :)

But you might get a lot of warnings and it could be difficult to find
new warnings from all the noise. In ath10k I just fixed all W=1 warnings
which I saw with gcc 8.1 and only now I was able to enable W=1 on my
build script.

-- 
Kalle Valo