linux-kernel - Re: [PATCH] powerpc/boot: fix broken way to pass CONFIG options

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Date:   Tue, 14 May 2019 00:03:10 +1000
From:   Oliver <oohall@...il.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Rob Herring <robh@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Rodrigo R. Galvao" <rosattig@...ux.vnet.ibm.com>,
        Paul Mackerras <paulus@...ba.org>,
        Joel Stanley <joel@....id.au>,
        Mark Greer <mgreer@...malcreek.com>
Subject: Re: [PATCH] powerpc/boot: fix broken way to pass CONFIG options

On Mon, May 13, 2019 at 11:56 PM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
>
> On Mon, May 13, 2019 at 9:33 PM Masahiro Yamada
> <yamada.masahiro@...ionext.com> wrote:
> >
> > Commit 5e9dcb6188a4 ("powerpc/boot: Expose Kconfig symbols to wrapper")
> > was wrong, but commit e41b93a6be57 ("powerpc/boot: Fix build failures
> > with -j 1") was also wrong.
> >
> > Check-in source files never ever depend on build artifacts.
> >
> > The correct dependency is:
> >
> >   $(obj)/serial.o: $(obj)/autoconf.h
> >
> > However, copying autoconf.h to arch/power/boot/ is questionable
> > in the first place.
> >
> > arch/powerpc/Makefile adopted multiple ways to pass CONFIG options.
> >
> > arch/powerpc/boot/decompress.c references CONFIG_KERNEL_GZIP and
> > CONFIG_KERNEL_XZ, which are passed via the command line.
> >
> > arch/powerpc/boot/serial.c includes the copied autoconf.h to
> > reference a couple of CONFIG options.
> >
> > Do not do this.
> >
> > We should have already learned that including autoconf.h from each
> > source file is really fragile.
> >
> > In fact, it is already broken.
> >
> > arch/powerpc/boot/ppc_asm.h references CONFIG_PPC_8xx, but
> > arch/powerpc/boot/utils.S is not given any way to access CONFIG
> > options. So, CONFIG_PPC_8xx is never defined here.
> >
> > Just pass $(LINUXINCLUDE) and remove all broken code.
> >
> > I also removed the -traditional flag to make include/linux/kconfig.h
> > work. I do not understand why it needs to imitate the behavior of
> > pre-standard C preprocessors.
> >
> > Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> > ---
>
>
> I re-read my commit log, and I thought it was needlessly
> too offensive. Sorry about that.
>
> I will reword the commit log and send v2.
>

No worries. We know the bootwrapper is... not great.

>
>
>
> --
> Best Regards
> Masahiro Yamada