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

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Message-ID: <CAJKOXPd4dCyuXKxAz-V=ujtiuKcumHzAx28y5J+6m+L7ZRLsZQ@mail.gmail.com>
Date:   Wed, 19 Sep 2018 08:39:04 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     joel@....id.au
Cc:     herbert@...dor.apana.org.au, linux-kernel@...r.kernel.org,
        mpe@...erman.id.au, oohall@...il.com,
        linuxppc-dev@...ts.ozlabs.org,
        Christophe LEROY <christophe.leroy@....fr>
Subject: Re: [PATCH] lib/xz: Fix powerpc build with KERNEL_XZ

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 :)

Best regards,
Krzysztof

>
> Fixes: faa16bc404d7 ("lib: Use existing define with polynomial")
> Signed-off-by: Joel Stanley <joel@....id.au>
> ---
> We need to clean up the powerpc boot decompresser but that work will be
> more involved than we would include in a late -rc. Please consider
> merging this fix for 4.19. Thanks!
>
>  lib/xz/xz_crc32.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/lib/xz/xz_crc32.c b/lib/xz/xz_crc32.c
> index 25a5d87e2e4c..34532d14fd4c 100644
> --- a/lib/xz/xz_crc32.c
> +++ b/lib/xz/xz_crc32.c
> @@ -15,7 +15,6 @@
>   * but they are bigger and use more memory for the lookup table.
>   */
>
> -#include <linux/crc32poly.h>
>  #include "xz_private.h"
>
>  /*
> @@ -30,7 +29,7 @@ STATIC_RW_DATA uint32_t xz_crc32_table[256];
>
>  XZ_EXTERN void xz_crc32_init(void)
>  {
> -       const uint32_t poly = CRC32_POLY_LE;
> +       const uint32_t poly = 0xEDB88320;
>
>         uint32_t i;
>         uint32_t j;
> --
> 2.17.1
>