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crypto: powerpc - Re-enable non-REFLECTed CRCs

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When CRC32c was included in the kernel, Anton ripped out
the #ifdefs around reflected polynomials, because CRC32c
is always reflected. However, not all CRCs use reflection
so we'd like to make it optional.

Restore the REFLECT parts from Anton's original CRC32
implementation (https://github.com/antonblanchard/crc32-vpmsum)

That implementation is available under GPLv2+, so we're OK
from a licensing point of view:
https://github.com/antonblanchard/crc32-vpmsum/blob/master/LICENSE.TXT

As CRC32c requires REFLECT, add that #define.

Cc: Anton Blanchard <anton@samba.org>
Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Daniel Axtens
2017-03-15 23:37:35 +11:00
committed by Herbert Xu
parent de696a2643
commit 08c7dd1bd4
2 changed files with 31 additions and 1 deletions
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1
arch/powerpc/crypto/crc32c-vpmsum_asm.S
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@@ -842,4 +842,5 @@
.octa 0x00000000000000000000000105ec76f1
#define CRC_FUNCTION_NAME __crc32c_vpmsum
#define REFLECT
#include "crc32-vpmsum_core.S"