[PATCH AUTOSEL 5.4 062/350] crypto: aegis128-neon - use Clang compatible cflags for ARM

Sasha Levin
2019-12-10T21:51:22Z

From: Ard Biesheuvel <ard.biesheuvel@linaro.org>

[ Upstream commit 2eb2d198bd6cd0083a5363ce66272fb34a19928f ]

The next version of Clang will start policing compiler command line
options, and will reject combinations of -march and -mfpu that it
thinks are incompatible.

This results in errors like

clang-10: warning: ignoring extension 'crypto' because the 'armv7-a'
architecture does not support it [-Winvalid-command-line-argument]
/tmp/aegis128-neon-inner-5ee428.s: Assembler messages:
/tmp/aegis128-neon-inner-5ee428.s:73: Error: selected
processor does not support `aese.8 q2,q14' in ARM mode

when buiding the SIMD aegis128 code for 32-bit ARM, given that the
'armv7-a' -march argument is considered to be compatible with the
ARM crypto extensions. Instead, we should use armv8-a, which does
allow the crypto extensions to be enabled.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
crypto/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/Makefile b/crypto/Makefile
index fcb1ee6797822..aa740c8492b9d 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -93,7 +93,7 @@ obj-$(CONFIG_CRYPTO_AEGIS128) += aegis128.o
aegis128-y := aegis128-core.o

ifeq ($(ARCH),arm)
-CFLAGS_aegis128-neon-inner.o += -ffreestanding -march=armv7-a -mfloat-abi=softfp
+CFLAGS_aegis128-neon-inner.o += -ffreestanding -march=armv8-a -mfloat-abi=softfp
CFLAGS_aegis128-neon-inner.o += -mfpu=crypto-neon-fp-armv8
aegis128-$(CONFIG_CRYPTO_AEGIS128_SIMD) += aegis128-neon.o aegis128-neon-inner.o
endif
--
2.20.1