Commit 9784d82d authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Catalin Marinas
Browse files

lib/crc32: make core crc32() routines weak so they can be overridden 



Allow architectures to drop in accelerated CRC32 routines by making
the crc32_le/__crc32c_le entry points weak, and exposing non-weak
aliases for them that may be used by the accelerated versions as
fallbacks in case the instructions they rely upon are not available.

Acked-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent cbbac1c3

lib/crc32.c

+7 −4
Original line number Diff line number Diff line
@@ -183,21 +183,21 @@ static inline u32 __pure crc32_le_generic(u32 crc, unsigned char const *p, 
}



#if CRC_LE_BITS == 1

u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len)

u32 __pure __weak crc32_le(u32 crc, unsigned char const *p, size_t len)

{

	return crc32_le_generic(crc, p, len, NULL, CRC32_POLY_LE);

}

u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len)

u32 __pure __weak __crc32c_le(u32 crc, unsigned char const *p, size_t len)

{

	return crc32_le_generic(crc, p, len, NULL, CRC32C_POLY_LE);

}

#else

u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len)

u32 __pure __weak crc32_le(u32 crc, unsigned char const *p, size_t len)

{

	return crc32_le_generic(crc, p, len,

			(const u32 (*)[256])crc32table_le, CRC32_POLY_LE);

}

u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len)

u32 __pure __weak __crc32c_le(u32 crc, unsigned char const *p, size_t len)

{

	return crc32_le_generic(crc, p, len,

			(const u32 (*)[256])crc32ctable_le, CRC32C_POLY_LE);
@@ -206,6 +206,9 @@ u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len) 
EXPORT_SYMBOL(crc32_le);

EXPORT_SYMBOL(__crc32c_le);



u32 crc32_le_base(u32, unsigned char const *, size_t) __alias(crc32_le);

u32 __crc32c_le_base(u32, unsigned char const *, size_t) __alias(__crc32c_le);



/*

 * This multiplies the polynomials x and y modulo the given modulus.

 * This follows the "little-endian" CRC convention that the lsbit

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