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Message-ID: <CAK8P3a3O1KLzxSTn1xqi2HjUVw2Utf6m5PZWd1ns7xsExxbJOA@mail.gmail.com>
Date:   Fri, 19 Nov 2021 17:27:17 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     "Alejandro Colomar (man-pages)" <alx.manpages@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Ajit Khaparde <ajit.khaparde@...adcom.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Borislav Petkov <bp@...e.de>,
        Corey Minyard <cminyard@...sta.com>, Chris Mason <clm@...com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        David Sterba <dsterba@...e.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Jason Wang <jasowang@...hat.com>,
        Jitendra Bhivare <jitendra.bhivare@...adcom.com>,
        John Hubbard <jhubbard@...dia.com>,
        "John S . Gruber" <JohnSGruber@...il.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Josef Bacik <josef@...icpanda.com>,
        Kees Cook <keescook@...omium.org>,
        Ketan Mukadam <ketan.mukadam@...adcom.com>,
        Len Brown <lenb@...nel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Russell King <linux@...linux.org.uk>,
        Somnath Kotur <somnath.kotur@...adcom.com>,
        Sriharsha Basavapatna <sriharsha.basavapatna@...adcom.com>,
        Subbu Seetharaman <subbu.seetharaman@...adcom.com>,
        Intel Graphics <intel-gfx@...ts.freedesktop.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
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Subject: Re: [PATCH 00/17] Add memberof(), split some headers, and slightly
 simplify code

On Fri, Nov 19, 2021 at 5:22 PM Alejandro Colomar (man-pages)
<alx.manpages@...il.com> wrote:
> On 11/19/21 17:18, Arnd Bergmann wrote:
> > On Fri, Nov 19, 2021 at 5:10 PM Andy Shevchenko
> > <andriy.shevchenko@...ux.intel.com> wrote:
> >> On Fri, Nov 19, 2021 at 04:57:46PM +0100, Arnd Bergmann wrote:
> >
> >>> The main problem with this approach is that as soon as you start
> >>> actually reducing the unneeded indirect includes, you end up with
> >>> countless .c files that no longer build because they are missing a
> >>> direct include for something that was always included somewhere
> >>> deep underneath, so I needed a second set of scripts to add
> >>> direct includes to every .c file.
> >>
> >> Can't it be done with cocci support?
> >
> > There are many ways of doing it, but they all tend to suffer from the
> > problem of identifying which headers are actually needed based on
> > the contents of a file, and also figuring out where to put the extra
> > #include if there are complex #ifdefs.
> >
> > For reference, see below for the naive pattern matching I tried.
> > This is obviously incomplete and partially wrong.
>
> FYI, if you may not know the tool,
> theres include-what-you-use(1) (a.k.a. iwyu(1))[1],
> although it is still not mature,
> and I'm helping improve it a bit.

Yes, I know that one, I tried using it as well, but it did not really
scale to the size of the kernel as it requires having all files to use
the correct set of #include, and to know about all the definitions.

       Arnd

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