netdev - Re: [PATCH net] docs: netdev: Document guidance on inline functions

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Message-ID: <20250203205039.15964b2f@foz.lan>
Date: Mon, 3 Feb 2025 20:50:39 +0100
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: Jonathan Corbet <corbet@....net>
Cc: Simon Horman <horms@...nel.org>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
 <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Alexandre Ferrieux
 <alexandre.ferrieux@...il.com>, netdev@...r.kernel.org,
 workflows@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH net] docs: netdev: Document guidance on inline functions

Em Mon, 03 Feb 2025 08:00:56 -0700
Jonathan Corbet <corbet@....net> escreveu:

> Simon Horman <horms@...nel.org> writes:
> 
> > Document preference for non inline functions in .c files.
> > This has been the preference for as long as I can recall
> > and I was recently surprised to discover that it is undocumented.
> >
> > Reported-by: Alexandre Ferrieux <alexandre.ferrieux@...il.com>
> > Closes: https://lore.kernel.org/all/9662e6fe-cc91-4258-aba1-ab5b016a041a@orange.com/
> > Signed-off-by: Simon Horman <horms@...nel.org>
> > ---
> >  Documentation/process/maintainer-netdev.rst | 11 +++++++++++
> >  1 file changed, 11 insertions(+)
> >
> > diff --git a/Documentation/process/maintainer-netdev.rst b/Documentation/process/maintainer-netdev.rst
> > index e497729525d5..1fbb8178b8cd 100644
> > --- a/Documentation/process/maintainer-netdev.rst
> > +++ b/Documentation/process/maintainer-netdev.rst
> > @@ -408,6 +408,17 @@ at a greater cost than the value of such clean-ups.
> >  
> >  Conversely, spelling and grammar fixes are not discouraged.
> >  
> > +Inline functions
> > +----------------
> > +
> > +The use of static inline functions in .c file is strongly discouraged
> > +unless there is a demonstrable reason for them, usually performance
> > +related. Rather, it is preferred to omit the inline keyword and allow the
> > +compiler to inline them as it sees fit.

You should probably point to chapter (12) of Documentation/process/coding-style.rst
where it mentions that inline for function prototypes and as a way to
replace macros are OK.

> > +
> > +This is a stricter requirement than that of the general Linux Kernel
> > +:ref:`Coding Style<codingstyle>`  
> 
> I have no objection to this change, but I do wonder if it does indeed
> belong in the central coding-style document.  I don't think anybody
> encourages use of "inline" these days...?

Indeed IMO this belongs to the coding style. I would place it close
to chapter (12) at Documentation/process/coding-style.rst.

Regards,

Thanks,
Mauro