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

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Message-ID: <YZfS4lCt8rMZ7UlS@smile.fi.intel.com>
Date:   Fri, 19 Nov 2021 18:37:54 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     "Alejandro Colomar (man-pages)" <alx.manpages@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>, 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 Fri, Nov 19, 2021 at 05:12:19PM +0100, Alejandro Colomar (man-pages) wrote:
> On 11/19/21 16:57, Arnd Bergmann wrote:

...

> > On the plus side, I did see something on the order of a 30%
> > compile speed improvement with clang, which is insane
> > given that this only removed dead definitions.
> 
> Huh!
> 
> I'd like to see the kernel some day
> not having _any_ hidden dependencies.

It's neither feasible nor practical. If we know the hard dependencies between
headers, why should we not use implicit inclusion?

We all know that bitmap.h includes bitops.h and this is good and a must, why
to avoid this?

-- 
With Best Regards,
Andy Shevchenko