From:   Toke =?utf-8?Q?H=C3=B8iland-J=C3=B8rgensen?= <toke@redhat.com>
To:     Kalle Valo <kvalo@codeaurora.org>
Cc:     YueHaibing <yuehaibing@huawei.com>,
        QCA ath9k Development <ath9k-devel@qca.qualcomm.com>,
        linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
        kernel-janitors@vger.kernel.org
Subject: Re: [PATCH] ath9k: remove set but not used variable 'acq'
In-Reply-To: <877edom8vl.fsf@kamboji.qca.qualcomm.com>
References: <20190225033246.127410-1-yuehaibing@huawei.com> <87lg24urgq.fsf@toke.dk> <87ftscmbh7.fsf@kamboji.qca.qualcomm.com> <87imx8uor2.fsf@toke.dk> <877edom8vl.fsf@kamboji.qca.qualcomm.com>
Date:   Mon, 25 Feb 2019 12:04:43 +0100
Message-ID: <877edouo1g.fsf@toke.dk>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8BIT
Sender: linux-wireless-owner@vger.kernel.org
Precedence: bulk

Kalle Valo <kvalo@codeaurora.org> writes:

> Toke Høiland-Jørgensen <toke@redhat.com> writes:
>
>> Kalle Valo <kvalo@codeaurora.org> writes:
>>
>>> Toke Høiland-Jørgensen <toke@redhat.com> writes:
>>>
>>>> YueHaibing <yuehaibing@huawei.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.

Ah, that was what that patch series was about :)

Right, well, I guess I'll give it a shot at some point and if it's not
too annoying I'll try to keep an eye on the warnings output...

-Toke