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SubjectRe: [PATCH] lib/xz: Fix powerpc build with KERNEL_XZ
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Le 19/09/2018 à 01:07, Joel Stanley a écrit :
> 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.
>
> Fixes: faa16bc404d7 ("lib: Use existing define with polynomial")
> Signed-off-by: Joel Stanley <joel@jms.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;

Maybe avoid capital letters ?

What about adding something like the following in xz_private.h instead:

#define CRC32_POLY_LE 0xedb88320

Christophe

>
> uint32_t i;
> uint32_t j;
>

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