linux-kernel - [PATCH] lib/xz: Put CRC32_POLY_LE in xz

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Date:   Fri, 21 Sep 2018 12:24:31 +0930
From:   Joel Stanley <joel@....id.au>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        Michael Ellerman <mpe@...erman.id.au>,
        Christophe LEROY <christophe.leroy@....fr>,
        Meelis Roos <mroos@...ux.ee>, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] lib/xz: Put CRC32_POLY_LE in xz_private.h

This fixes a regression introduced by 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 decompresser 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.

This allows users of the xz library to avoid including headers from
'include/linux/' while still achieving the cleanup of the magic number.

Fixes: faa16bc404d72a5 ("lib: Use existing define with polynomial")
Reported-by: Meelis Roos <mroos@...ux.ee>
Reported-by: kbuild test robot <lkp@...el.com>
Suggested-by: Christophe LEROY <christophe.leroy@....fr>
Signed-off-by: Joel Stanley <joel@....id.au>
---
 lib/xz/xz_crc32.c   | 1 -
 lib/xz/xz_private.h | 4 ++++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/xz/xz_crc32.c b/lib/xz/xz_crc32.c
index 25a5d87e2e4c..912aae5fa09e 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"
 
 /*
diff --git a/lib/xz/xz_private.h b/lib/xz/xz_private.h
index 482b90f363fe..09360ebb510e 100644
--- a/lib/xz/xz_private.h
+++ b/lib/xz/xz_private.h
@@ -102,6 +102,10 @@
 #	endif
 #endif
 
+#ifndef CRC32_POLY_LE
+#define CRC32_POLY_LE 0xedb88320
+#endif
+
 /*
  * Allocate memory for LZMA2 decoder. xz_dec_lzma2_reset() must be used
  * before calling xz_dec_lzma2_run().
-- 
2.17.1