linux-kernel - Re: [PATCH v2] powerpc/boot: pass CONFIG options in a simpler and more robust way

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Date:   Thu, 04 Jul 2019 10:26:48 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linuxppc-dev@...ts.ozlabs.org
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Rob Herring <robh@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linux-kernel@...r.kernel.org, Oliver O'Halloran <oohall@...il.com>,
        Paul Mackerras <paulus@...ba.org>,
        Joel Stanley <joel@....id.au>,
        Mark Greer <mgreer@...malcreek.com>
Subject: Re: [PATCH v2] powerpc/boot: pass CONFIG options in a simpler and more robust way

Masahiro Yamada <yamada.masahiro@...ionext.com> writes:

> 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.
>
> The correct dependency is:
>
>   $(obj)/serial.o: $(obj)/autoconf.h
>
> However, I do not see the reason why we need to copy autoconf.h to
> arch/power/boot/. Nor do I see consistency in the way of passing
> CONFIG options.
>
> decompress.c references CONFIG_KERNEL_GZIP and CONFIG_KERNEL_XZ, which
> are passed via the command line.
>
> serial.c includes autoconf.h to reference a couple of CONFIG options,
> but this is fragile because we often forget to include "autoconf.h"
> from source files.
>
> In fact, it is already broken.
>
> ppc_asm.h references CONFIG_PPC_8xx, but utils.S is not given any way
> to access CONFIG options. So, CONFIG_PPC_8xx is never defined here.
>
> Pass $(LINUXINCLUDE) to make sure CONFIG options are accessible from
> all .c and .S files in arch/powerpc/boot/.

This breaks our skiroot_defconfig, I don't know why yet:

  In file included from /kisskb/src/arch/powerpc/boot/../../../lib/decompress_unxz.c:236:0,
                   from /kisskb/src/arch/powerpc/boot/decompress.c:42:
  /kisskb/src/arch/powerpc/boot/../../../lib/xz/xz_dec_bcj.c: In function 'bcj_powerpc':
  /kisskb/src/arch/powerpc/boot/../../../lib/xz/xz_dec_bcj.c:166:11: warning: implicit declaration of function 'get_unaligned_be32' [-Wimplicit-function-declaration]
     instr = get_unaligned_be32(buf + i);


http://kisskb.ellerman.id.au/kisskb/buildresult/13862914/

cheers