[Linux-kernel-mentees] Alternative to checkpatch fix options

Lukas Bulwahn lukas.bulwahn at gmail.com
Mon Nov 23 12:07:07 UTC 2020

On Mon, Nov 23, 2020 at 12:48 PM Joe Perches <joe at perches.com> wrote:
> On Mon, 2020-11-23 at 10:33 +0100, Lukas Bulwahn wrote:
> > Dear Aditya and Dwaipayan,
> >
> > For creating fix options to checkpatch rules, please note that:
> []
> > it simply might be easier to invoke
> > clang-format with a limited rule set for specific formatting fixes
> > rather than trying to implement all of those syntactic fixes in
> > checkpatch itself.
> >
> > Aditya, Dwaipayan, can you please consider that option and investigate
> > the clang-format capability to do the fix before implementing that in
> > checkpatch?
> Which could be extremely cool if clang-format works on patch contexts.
> But as far as I know it does not.  clang-format-diff does.

I used the term "clang-format" in my mail as the overall term for
"clang-format" and "clang-format-diff".

> What maybe could happen is integration with checkpatch and the actual
> application of the patch to a temporary file and then using
> clang-format on the modified block similar to the integration of
> clang-format and vim or emacs with selected contexts.
> Maybe the integration of clang-format-diff could be done, but my
> reading of its help file seems to show the newly added line needs to
> be extracted without context. (ie: using -U0)
> Anyway, please do investigate the integration because as you've
> probably noticed, adding --fix rules to checkpatch can be painful.
> I'm not in any way against this concept or integration, but I do not
> expect this clang-format-diff integration to go particularly well
> unless the patch context provided is an entire statement.
> Maybe checkpatch could learn to apply patch series or could be
> integrated along with git to apply patch series to a test branch
> and clang-format-diff and the entire statement or function around
> any change could be extracted and again run through clang-format.
> I suggest you play with it and see what you can do.

I agree. It is by no means straightforward to run clang-format on a
patch (or on a git commit) and integrate it with checkpatch... it will
need a bit of exploration, investigation along those lines you

Aditya, Dwaipayan, feel free to explore and use the mentees list to
exchange ideas and investigations.


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