linux-kernel - Re: [PATCH 1/2] export.h: remove defined(__KERNEL_

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Date:   Mon, 9 Sep 2019 22:21:22 -0400 (EDT)
From:   Nicolas Pitre <nico@...xnic.net>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Denis Efremov <efremov@...ux.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] export.h: remove defined(__KERNEL__)

On Tue, 10 Sep 2019, Masahiro Yamada wrote:

> On Tue, Sep 10, 2019 at 1:06 AM Nicolas Pitre <nico@...xnic.net> wrote:
> >
> > On Mon, 9 Sep 2019, Masahiro Yamada wrote:
> >
> > > Hi Nicolas,
> > >
> > > On Mon, Sep 9, 2019 at 10:48 PM Nicolas Pitre <nico@...xnic.net> wrote:
> > > >
> > > > On Mon, 9 Sep 2019, Masahiro Yamada wrote:
> > > >
> > > > > This line was touched by commit f235541699bc ("export.h: allow for
> > > > > per-symbol configurable EXPORT_SYMBOL()"), but the commit log did
> > > > > not explain why.
> > > > >
> > > > > CONFIG_TRIM_UNUSED_KSYMS works for me without defined(__KERNEL__).
> > > >
> > > > I'm pretty sure it was needed back then so not to interfere with users
> > > > of this file. My fault for not documenting it.
> > >
> > > Hmm, I did not see a problem in my quick build test.
> > >
> > > Do you remember which file was causing the problem?
> >
> > If you build commit 7ec925701f5f with CONFIG_TRIM_UNUSED_KSYMS=y and the
> > defined(__KERNEL__) test removed then you'll get:
> >
> >   HOSTCC  scripts/mod/modpost.o
> > In file included from scripts/mod/modpost.c:24:
> > scripts/mod/../../include/linux/export.h:81:10: fatal error: linux/kconfig.h: No such file or directory
> >
> >
> > Nicolas
> 
> 
> Thanks for explaining this.
> 
> It is not the case any more.
> 
> 
> I will reword the commit message as follows:
> 
> ------------------------>8---------------------------------------
> export.h: remove defined(__KERNEL__), which is no longer needed
> 
> The conditional define(__KERNEL__) was added by commit f235541699bc
> ("export.h: allow for per-symbol configurable EXPORT_SYMBOL()").
> 
> It was needed at that time to avoid the build error of modpost
> with CONFIG_TRIM_UNUSED_KSYMS=y.
> 
> Since commit b2c5cdcfd4bc ("modpost: remove symbol prefix support"),
> modpost no longer includes linux/export.h, thus the define(__KERNEL__)
> is unneeded.
> ------------------------>8---------------------------------------
> 

Acked-by: Nicolas Pitre <nico@...xnic.net>


Nicolas