linux-kernel - Re: [PATCH 00/17] Add memberof(), split some headers, and slightly simplify code

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Date:   Fri, 19 Nov 2021 17:22:48 +0100
From:   "Alejandro Colomar (man-pages)" <alx.manpages@...il.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     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>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-btrfs <linux-btrfs@...r.kernel.org>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        "open list:DRM DRIVER FOR QEMU'S CIRRUS DEVICE" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH 00/17] Add memberof(), split some headers, and slightly
 simplify code



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.

If I understood better the kernel Makefiles,
I'd try it.

You can try it yourselves.
I still can't use it for my own code,
since it has a lot of false positives.

Cheers,
Alex

[1]: <https://include-what-you-use.org/>


-- 
Alejandro Colomar
Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/
http://www.alejandro-colomar.es/