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

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Message-ID: <20200908084953.GJ4400@dell>
Date:   Tue, 8 Sep 2020 09:49:53 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Kalle Valo <kvalo@...eaurora.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

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?

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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