netdev - Re: Clang warning in drivers/net/ethernet/intel/igc/igc

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Message-ID: <20190208143403.GD7035@unicorn.suse.cz>
Date:   Fri, 8 Feb 2019 15:34:03 +0100
From:   Michal Kubecek <mkubecek@...e.cz>
To:     netdev@...r.kernel.org
Cc:     Nathan Chancellor <natechancellor@...il.com>,
        Sasha Neftin <sasha.neftin@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Aaron Brown <aaron.f.brown@...el.com>,
        intel-wired-lan@...ts.osuosl.org, linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: Clang warning in drivers/net/ethernet/intel/igc/igc_ethtool.c

On Thu, Feb 07, 2019 at 10:09:21PM -0700, Nathan Chancellor wrote:
> Hi all,
> 
> After commit 8c5ad0dae93c ("igc: Add ethtool support"), Clang warns:
> 
> drivers/net/ethernet/intel/igc/igc_ethtool.c:9:19: warning: variable 'igc_priv_flags_strings' is not needed and will not be emitted [-Wunneeded-internal-declaration]
> static const char igc_priv_flags_strings[][ETH_GSTRING_LEN] = {
>                   ^
> 1 warning generated.
> 
> igc_priv_flags_strings is only used in an ARRAY_SIZE macro, which is a
> compile time evaluation, so no reference to it is being emitted in the
> final assembly. Is it actually needed and was forgotten to be used
> somewhere or could it be eliminated so that Clang no longer warns?

That's because the driver provides get_priv_flags() and set_priv_flags()
callbacks in its ethtool_ops to allow querying and setting legacy-rx
private flag but it does not provide get_sset_count() and get_strings()
to provide list of private flags to userspace ethtool.

Michal Kubecek