linux-kernel - Re: linux-next: Fixes tags need some work in the pm tree

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Date:   Wed, 16 Jan 2019 00:06:59 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sinan Kaya <okaya@...nel.org>,
        Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: Re: linux-next: Fixes tags need some work in the pm tree

On Tuesday, January 15, 2019 11:43:05 PM CET Stephen Rothwell wrote:
> Hi Rafael,
> 
> On Tue, 15 Jan 2019 23:13:16 +0100 "Rafael J. Wysocki" <rjw@...ysocki.net> wrote:
> >
> > On Tuesday, January 15, 2019 9:55:40 PM CET Stephen Rothwell wrote:
> > > [I am experimenting with checking the Fixes tags in commits in linux-next.
> > > Please let me know if you think I am being too strict.]
> > > 
> > > Hi Rafael,
> > > 
> > > Commits
> > > 
> > >   62b33d57c534 ("drivers: thermal: int340x_thermal: Make PCI dependency explicit")
> > >   cd793ab22a93 ("x86/intel/lpss: Make PCI dependency explicit")
> > >   42ac19e7b81e ("ACPI: EC: Look for ECDT EC after calling acpi_load_tables()")
> > >   6c29b81b5695 ("platform/x86: apple-gmux: Make PCI dependency explicit")
> > >   34783dc0182a ("platform/x86: intel_pmc: Make PCI dependency explicit")
> > >   704658d1d3ae ("platform/x86: intel_ips: make PCI dependency explicit")
> > >   5df37f3a1aa9 ("vga-switcheroo: make PCI dependency explicit")
> > >   da1df6ee4296 ("ata: pata_acpi: Make PCI dependency explicit")
> > >   ce97a22a596b ("ACPI / LPSS: Make PCI dependency explicit")
> > > 
> > > Have malformed Fixes tags:
> > > 
> > > There should be double quotes around the commit subject.  
> > 
> > Well, where does this requirement come from?
> > 
> > It hasn't been there before AFAICS.
> 
> Documentation/process/submitting-patches.rst has the following, but I
> am sure people are happy to discuss changes and it does say "For
> example", so maybe I am being to strict?

If that's the source of it, then it's rather weak IMO.

Formal requirements should be documented as such and I would expect that
to happen through the usual process: patch submission, review, acceptance etc.

Moreover, extending advice on to how submit paches to formatting requirements
for commits feels like a bit of a stretch to me.

> The counter argument is that
> there are various (semi-)automated processes that use these tags and
> being consistent probably makes those processes (and life for those who
> run them) easier.

And frankly I wouldn't expect any of these to even look at the summary
lines as they have not been consistent historically and the SHA-1 ID should
be sufficient to identify the commit in question.

Anyway, I'm not against formalizing the Fixes: tags, but I would rather expect
that to be done in a, well, more formal way.

> ------------------------------------------------------------------------
> If your patch fixes a bug in a specific commit, e.g. you found an issue using
> ``git bisect``, please use the 'Fixes:' tag with the first 12 characters of
> the SHA-1 ID, and the one line summary.  For example::
> 
>         Fixes: e21d2170f366 ("video: remove unnecessary platform_set_drvdata()")
> 
> The following ``git config`` settings can be used to add a pretty format for
> outputting the above style in the ``git log`` or ``git show`` commands::
> 
>         [core]
>                 abbrev = 12
>         [pretty]
>                 fixes = Fixes: %h (\"%s\")
> ------------------------------------------------------------------------

Cheers,
Rafael