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Date: Wed, 19 Nov 2025 10:35:45 -0800
From: Jakub Kicinski <kuba@kernel.org>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: "Russell King (Oracle)" <linux@armlinux.org.uk>, Vladimir Oltean
 <vladimir.oltean@nxp.com>, netdev@vger.kernel.org, Andrew Lunn
 <andrew@lunn.ch>, Heiner Kallweit <hkallweit1@gmail.com>, "David S. Miller"
 <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, Paolo Abeni
 <pabeni@redhat.com>, linux-kernel@vger.kernel.org, Serge Semin
 <fancer.lancer@gmail.com>, Herve Codina <herve.codina@bootlin.com>, Rob
 Herring <robh@kernel.org>, Krzysztof Kozlowski <krzk+dt@kernel.org>, Conor
 Dooley <conor+dt@kernel.org>, devicetree@vger.kernel.org
Subject: Re: [PATCH net-next 14/15] net: dsa: sja1105: replace mdiobus-pcs
 with xpcs-plat driver
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On Wed, 19 Nov 2025 19:39:32 +0200 Andy Shevchenko wrote:
> On Wed, Nov 19, 2025 at 05:23:48PM +0000, Russell King (Oracle) wrote:
> > On Wed, Nov 19, 2025 at 06:17:48PM +0200, Andy Shevchenko wrote:  
> > > On Wed, Nov 19, 2025 at 08:11:12AM -0800, Jakub Kicinski wrote:  
> > I can say that stuff such as unused const variables gets found by
> > nipa, via -Wunused-const-variable, which as I understand it is a
> > W=1 thing.
> > 
> > I suspect CONFIG_WERROR=y isn't used (I don't know) as that would
> > stop the build on warnings, whereas what is done instead is that
> > the output of the build is analysed, and the number of warnings
> > counted and reported in patchwork. Note that the "build" stuff
> > reports number of errors/warnings before and after the patch.
> > 
> > Hope this answers your question.  
> 
> Pretty much, thanks!

We do:

prep_config() {
  make LLVM=1 O=$output_dir allmodconfig
  ./scripts/config --file $output_dir/.config -d werror
  ./scripts/config --file $output_dir/.config -d drm_werror
  ./scripts/config --file $output_dir/.config -d kvm_werror
}

I have strong feelings about people who think Werror is an acceptable
practice in 2025, but let me not violate the CoC here..