linux-kernel - Re: [PATCH] lib/xz: Fix powerpc build with KERNEL

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Date:   Fri, 21 Sep 2018 12:00:36 +0930
From:   Joel Stanley <joel@....id.au>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        "Oliver O'Halloran" <oohall@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, christophe.leroy@....fr
Subject: Re: [PATCH] lib/xz: Fix powerpc build with KERNEL_XZ

On Wed, 19 Sep 2018 at 16:09, Krzysztof Kozlowski <krzk@...nel.org> wrote:
>
> On Wed, 19 Sep 2018 at 01:08, Joel Stanley <joel@....id.au> wrote:
> >
> > This partially reverts faa16bc404d72a5 ("lib: Use existing define with
> > polynomial").
> >
> > The cleanup added a dependency on include/linux, which broke the PowerPC
> > boot wrapper/decompresser when KERNEL_XZ is enabled:
> >
> >   BOOTCC  arch/powerpc/boot/decompress.o
> >  In file included from arch/powerpc/boot/../../../lib/decompress_unxz.c:233,
> >                  from arch/powerpc/boot/decompress.c:42:
> >  arch/powerpc/boot/../../../lib/xz/xz_crc32.c:18:10: fatal error:
> >  linux/crc32poly.h: No such file or directory
> >   #include <linux/crc32poly.h>
> >            ^~~~~~~~~~~~~~~~~~~
> >
> > The powerpc decompressor is a hairy corner of the kernel. Even while building
> > a 64-bit kernel it needs to build a 32-bit binary and therefore avoid including
> > files from include/linux.
>
> I fixed the build error here:
> https://lkml.org/lkml/2018/8/29/179
>
> If you choose to remove any includes from /linux, then go ahead but
> please use original reported-by :)

Okay. I'll try Christophe's suggestion instead.

Cheers,

Joel