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Message-ID: <20190301204042.GM29992@unicorn.suse.cz> Date: Fri, 1 Mar 2019 21:40:42 +0100 From: Michal Kubecek <mkubecek@...e.cz> To: Nick Desaulniers <ndesaulniers@...gle.com> Cc: netdev@...r.kernel.org, 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, LKML <linux-kernel@...r.kernel.org> Subject: Re: Clang warning in drivers/net/ethernet/intel/igc/igc_ethtool.c On Fri, Mar 01, 2019 at 10:28:35AM -0800, Nick Desaulniers wrote: > On Fri, Feb 8, 2019 at 6:34 AM Michal Kubecek <mkubecek@...e.cz> wrote: > > > > 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. > > So the variable declaration should get a `__unused` annotation then > (and maybe a comment)? I would rather suggest to add missing ethtool_ops handlers so that the flag can be actually shown and set using ethtool. Michal Kubecek
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