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

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Message-ID: <CAK7LNAQjukukcfz9-SyFhqZOZ1v18CJDVA8Zmn5RL92Q=73ZxA@mail.gmail.com>
Date:   Mon, 13 May 2019 22:55:17 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     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>,
        "Oliver O'Halloran" <oohall@...il.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 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.




-- 
Best Regards
Masahiro Yamada