Commit efa7cebd authored Feb 28, 2017 by Ard Biesheuvel Committed by Herbert Xu Mar 01, 2017

crypto: arm/crc32 - add build time test for CRC instruction support



The accelerated CRC32 module for ARM may use either the scalar CRC32
instructions, the NEON 64x64 to 128 bit polynomial multiplication
(vmull.p64) instruction, or both, depending on what the current CPU
supports.

However, this also requires support in binutils, and as it turns out,
versions of binutils exist that support the vmull.p64 instruction but
not the crc32 instructions.

So refactor the Makefile logic so that this module only gets built if
binutils has support for both.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

parent 1fb1683c

arch/arm/crypto/Makefile

+11 −1

Original line number	Diff line number	Diff line
		@@ -15,7 +15,17 @@ ce-obj-$(CONFIG_CRYPTO_SHA1_ARM_CE) += sha1-arm-ce.o
		ce-obj-$(CONFIG_CRYPTO_SHA2_ARM_CE) += sha2-arm-ce.o
		ce-obj-$(CONFIG_CRYPTO_GHASH_ARM_CE) += ghash-arm-ce.o
		ce-obj-$(CONFIG_CRYPTO_CRCT10DIF_ARM_CE) += crct10dif-arm-ce.o
		ce-obj-$(CONFIG_CRYPTO_CRC32_ARM_CE) += crc32-arm-ce.o
		crc-obj-$(CONFIG_CRYPTO_CRC32_ARM_CE) += crc32-arm-ce.o

		ifneq ($(crc-obj-y)$(crc-obj-m),)
		ifeq ($(call as-instr,.arch armv8-a\n.arch_extension crc,y,n),y)
		ce-obj-y += $(crc-obj-y)
		ce-obj-m += $(crc-obj-m)
		else
		$(warning These CRC Extensions modules need binutils 2.23 or higher)
		$(warning $(crc-obj-y) $(crc-obj-m))
		endif
		endif

		ifneq ($(ce-obj-y)$(ce-obj-m),)
		ifeq ($(call as-instr,.fpu crypto-neon-fp-armv8,y,n),y)