linux-kernel - Re: [PATCH 16/28] wireless: marvell: mwifiex: init: Move 'tos_to_tid

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Message-ID: <010101746d98d281-78bf23c9-db60-486f-ada9-fec0467131a4-000000@us-west-2.amazonses.com>
Date:   Tue, 8 Sep 2020 12:02:46 +0000
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     davem@...emloft.net, kuba@...nel.org, linux-kernel@...r.kernel.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        Amitkumar Karwar <amitkarwar@...il.com>,
        Ganapathi Bhat <ganapathi.bhat@....com>,
        Xinming Hu <huxinming820@...il.com>
Subject: Re: [PATCH 16/28] wireless: marvell: mwifiex: init: Move 'tos_to_tid_inv' to where it's used

Lee Jones <lee.jones@...aro.org> writes:

> On Mon, 31 Aug 2020, Kalle Valo wrote:
>
>> Lee Jones <lee.jones@...aro.org> wrote:
>> 
>> > 'tos_to_tid_inv' is only used in 2 of 17 files it's current being
>> > included into.
>> > 
>> > Fixes the following W=1 kernel build warning(s):
>> > 
>> >  In file included from drivers/net/wireless/marvell/mwifiex/main.c:23:
>> >  In file included from drivers/net/wireless/marvell/mwifiex/cmdevt.c:26:
>> >  In file included from drivers/net/wireless/marvell/mwifiex/util.c:25:
>> >  In file included from drivers/net/wireless/marvell/mwifiex/txrx.c:25:
>> >  In file included from drivers/net/wireless/marvell/mwifiex/11n.c:25:
>> >  In file included from drivers/net/wireless/marvell/mwifiex/wmm.c:25:
>> >  In file included from drivers/net/wireless/marvell/mwifiex/11n_aggr.c:25:
>> >  In file included from drivers/net/wireless/marvell/mwifiex/11n_rxreorder.c:25:
>> >  In file included from drivers/net/wireless/marvell/mwifiex/join.c:25:
>> >  In file included from drivers/net/wireless/marvell/mwifiex/sta_cmd.c:25:
>> >  In file included from drivers/net/wireless/marvell/mwifiex/sta_ioctl.c:25:
>> >  In file included from drivers/net/wireless/marvell/mwifiex/sta_event.c:25:
>> >  In file included from drivers/net/wireless/marvell/mwifiex/uap_txrx.c:23:
>> >  In file included from drivers/net/wireless/marvell/mwifiex/sdio.c:27:
>> >  In file included from drivers/net/wireless/marvell/mwifiex/sta_tx.c:25:
>> >  drivers/net/wireless/marvell/mwifiex/wmm.h:41:17: warning:
>> > ‘tos_to_tid_inv’ defined but not used [-Wunused-const-variable=]
>> >  41 | static const u8 tos_to_tid_inv[] = {
>> > 
>> >  NB: Snipped for brevity
>> > 
>> > Cc: Amitkumar Karwar <amitkarwar@...il.com>
>> > Cc: Ganapathi Bhat <ganapathi.bhat@....com>
>> > Cc: Xinming Hu <huxinming820@...il.com>
>> > Cc: Kalle Valo <kvalo@...eaurora.org>
>> > Cc: "David S. Miller" <davem@...emloft.net>
>> > Cc: Jakub Kicinski <kuba@...nel.org>
>> > Cc: linux-wireless@...r.kernel.org
>> > Cc: netdev@...r.kernel.org
>> > Signed-off-by: Lee Jones <lee.jones@...aro.org>
>> 
>> The patch creates two duplicate arrays, this makes it worse than it was
>> before.
>
> We have a choice (and you don't like either of them). :)
>
> Either add the variable into the file(s) they are used or tell the
> compiler that it's okay for other files to declare but not used them
> (mark as __maybe_unused).
>
> What is your preferred solution?

Yue already sent a patch for this (at least I think so, not 100% sure if
this is the same case):

https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers-next.git/commit/?id=d56ee19a148edaa9972ca12f817e395ba436078b

But that's the solution I like :) There's only one array and it's shared
by all the users.

-- 
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches