linux-kernel - Re: [GIT PULL 3/6] ARM: SoC driver updates for 5.1

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Message-ID: <CAHk-=wgdJKaDt=Dp_DS+LL3bzRZUo2VHHMZU_VUMukSPzRJPUw@mail.gmail.com>
Date:   Wed, 6 Mar 2019 10:09:28 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     soc@...nel.org, Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        arm-soc <arm@...nel.org>
Subject: Re: [GIT PULL 3/6] ARM: SoC driver updates for 5.1

On Wed, Mar 6, 2019 at 7:34 AM Arnd Bergmann <arnd@...db.de> wrote:
>
>   git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc.git tags/armsoc-drivers

This caused a surprising number of kernel file rebuilds for me, and
the reason was

>  include/linux/mod_devicetable.h                                     |   9 +

It turns out that the above is indirectly included from a _lot_ of
code device header files.

The reason seems to be the various 'struct *_device_id' declarations,
that then all the different header files want.

So a tiny change in an oddball header file causes a lot of recompiles.

Oh well. I don't know if there is anything to be done, but I did react
to how some surprising changes cause a lot of build activity, and it's
not always obvious.

                Linus