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

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Message-ID: <20200908121715.GS4400@dell>
Date:   Tue, 8 Sep 2020 13:17:15 +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 Tue, 08 Sep 2020, Kalle Valo wrote:

> 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.

Any idea if this results in anything different from making use of
__maybe_unused once compiled?

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