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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2019-09-17 09:50:00 +0100
committerHerbert Xu <herbert@gondor.apana.org.au>2019-10-01 23:06:42 +1000
commit3aa6d4abd4ebf07c36e0a9a507af0311fcb267dc (patch)
tree839e5488f495098249be4965f2e658447abea64b
parentbf6a7a5ad6fa69e48b735be75eeb90569d9584bb (diff)
downloadlinux-3aa6d4abd4ebf07c36e0a9a507af0311fcb267dc.tar.bz2
crypto: arm/aes-ce - build for v8 architecture explicitly
The NEON/Crypto Extensions based AES implementation for 32-bit ARM can be built in a kernel that targets ARMv6 CPUs and higher, even though the actual code will not be able to run on that generation, but it allows for a portable image to be generated that can will use the special instructions only when they are available. Since those instructions are part of a FPU profile rather than a CPU profile, we don't override the architecture in the assembler code, and most of the scalar code is simple enough to be ARMv6 compatible. However, that changes with commit c61b1607ed4fbbf2, which introduces calls to the movw/movt instructions, which are v7+ only. So override the architecture in the .S file to armv8-a, which matches the architecture specification in the crypto-neon-fp-armv8 FPU specificier that we already using. Note that using armv7-a here may trigger an issue with the upcoming Clang 10 release, which no longer permits .arch/.fpu combinations it views as incompatible. Reported-by: kbuild test robot <lkp@intel.com> Fixes: c61b1607ed4fbbf2 ("crypto: arm/aes-ce - implement ciphertext stealing ...") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
-rw-r--r--arch/arm/crypto/aes-ce-core.S1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/crypto/aes-ce-core.S b/arch/arm/crypto/aes-ce-core.S
index b978cdf133af..4d1707388d94 100644
--- a/arch/arm/crypto/aes-ce-core.S
+++ b/arch/arm/crypto/aes-ce-core.S
@@ -9,6 +9,7 @@
#include <asm/assembler.h>
.text
+ .arch armv8-a
.fpu crypto-neon-fp-armv8
.align 3