linux-kernel - Re: [PATCH (set 1) 00/20] Rid W=1 warnings from GPU

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Message-ID: <20230824120859.GT1380343@google.com>
Date:   Thu, 24 Aug 2023 13:08:59 +0100
From:   Lee Jones <lee@...nel.org>
To:     Jani Nikula <jani.nikula@...ux.intel.com>
Cc:     Karol Herbst <kherbst@...hat.com>, nouveau@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org,
        Mikko Perttunen <mperttunen@...dia.com>,
        Maíra Canal <mairacanal@...eup.net>,
        Thierry Reding <thierry.reding@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Mario Limonciello <mario.limonciello@....com>,
        Shashank Sharma <shashank.sharma@....com>,
        Michal Simek <michal.simek@...inx.com>,
        amd-gfx@...ts.freedesktop.org,
        Jonathan Hunter <jonathanh@...dia.com>,
        Luben Tuikov <luben.tuikov@....com>,
        Danilo Krummrich <dakr@...hat.com>,
        Ben Skeggs <bskeggs@...hat.com>, linux-media@...r.kernel.org,
        Stanley Yang <Stanley.Yang@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Maxime Ripard <mripard@...nel.org>,
        linaro-mm-sig@...ts.linaro.org, linux-tegra@...r.kernel.org,
        NXP Linux Team <linux-imx@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Hyun Kwon <hyun.kwon@...inx.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        "Pan, Xinhui" <Xinhui.Pan@....com>, linux-kernel@...r.kernel.org,
        Jerome Glisse <glisse@...edesktop.org>,
        Alex Deucher <alexander.deucher@....com>,
        Gourav Samaiya <gsamaiya@...dia.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Christian König <christian.koenig@....com>,
        Hawking Zhang <Hawking.Zhang@....com>
Subject: Re: [PATCH (set 1) 00/20] Rid W=1 warnings from GPU

On Thu, 24 Aug 2023, Lee Jones wrote:

> On Thu, 24 Aug 2023, Jani Nikula wrote:
> 
> > On Thu, 24 Aug 2023, Lee Jones <lee@...nel.org> wrote:
> > > This set is part of a larger effort attempting to clean-up W=1
> > > kernel builds, which are currently overwhelmingly riddled with
> > > niggly little warnings.
> > 
> > The next question is, how do we keep it W=1 clean going forward?
> 
> My plan was to fix them all, then move each warning to W=0.

Some history:

- Starting with v5.8-rc1:       18867
- 2020-07-01:                   18089
- 2020-07-07:                   17288
- 2020-07-17:                   15762
- 2020-07-20:                   15724
- 2020-07-23:                   15116
- 2020-08-12:                   15184
- 2020-10-19:                   10909
- 2020-11-04:                    9385
- 2021-01-04:                    5478
- 2021-01-12                     4749
- 2021-01-29                     4911
- 2021-04-07                     3594
- 2021-05-20                     2938
- 2021-07-01                     2587
- 2023-02-10                     2587
- 2023-08-22                     1650

> Arnd recently submitted a set doing just that for a bunch of them.
> 
> https://lore.kernel.org/all/20230811140327.3754597-1-arnd@kernel.org/
> 
> I like to think a bunch of this is built on top of my previous efforts.
> 
> GPU is a particularly tricky though - the warnings seem to come in faster
> than I can squash them.  Maybe the maintainers can find a way to test
> new patches on merge?
> 
> > Most people don't use W=1 because it's too noisy, so it's a bit of a
> > catch-22.
> > 
> > In i915, we enable a lot of W=1 warnings using subdir-ccflags-y in our
> > Makefile. For CI/developer use we also enable kernel-doc warnings by
> > default.
> > 
> > Should we start enabling some of those warning flags in drm/Makefile to
> > to keep the entire subsystem warning free?
> 
> That would we awesome!  We'd just need buy-in.

-- 
Lee Jones [李琼斯]