linux-kernel - Re: [PATCH 1/2] pinctrl: remove unneeded #ifdef around declarations

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Message-ID: <CAK7LNAQ4KmXd0J2UYfi9WiisnfGa4g62BH2S46ELn4fYG05UcA@mail.gmail.com>
Date:   Fri, 14 Jun 2019 23:59:45 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] pinctrl: remove unneeded #ifdef around declarations

On Fri, Jun 14, 2019 at 10:21 PM Enrico Weigelt, metux IT consult
<lkml@...ux.net> wrote:
>
> On 13.06.19 03:55, Masahiro Yamada wrote:
> > What is the point in surrounding the whole of declarations with
> > ifdef like this?
> >
> >   #ifdef CONFIG_FOO
> >   int foo(void);
> >   #endif
> >
> > If CONFIG_FOO is not defined, all callers of foo() will fail
> > with implicit declaration errors since the top Makefile adds
> > -Werror-implicit-function-declaration to KBUILD_CFLAGS.
> >
> > This breaks the build earlier when you are doing something wrong.
> > That's it.
>
> hmm, in general I like the idea of breaking the build as early as
> possible. depending on your available cpu power, a kernel build can
> take a while, and it could be a huge waste of time when having to
> wait for link stage, just to find out about missing functions.
>
> @linus: what's your oppinion ?
>
>
> --mtx
>
> --
> Enrico Weigelt, metux IT consult
> Free software and Linux embedded engineering
> info@...ux.net -- +49-151-27565287


My previous clean-up (http://patchwork.ozlabs.org/patch/1112656/)
broke this build.

And, this patch will fix the build issue.

Did you realize the madness of
surrounding the forward declarations with #ifdef ?


All GPIO/pinctrl headers are written in a bad way.

Linus Walleij must realize he was doing *wrong*.


-- 
Best Regards
Masahiro Yamada