On 2017-12-01 18:24:10 [+0000], Dave Martin wrote:

quoted

diff --git a/arch/arm64/crypto/Kconfig b/arch/arm64/crypto/Kconfig
index 70c517aa4501..2a5f05b5a19a 100644
--- a/arch/arm64/crypto/Kconfig
+++ b/arch/arm64/crypto/Kconfig

@@ -19,19 +19,19 @@ config CRYPTO_SHA512_ARM64

 config CRYPTO_SHA1_ARM64_CE
    tristate "SHA-1 digest algorithm (ARMv8 Crypto Extensions)"
-   depends on KERNEL_MODE_NEON
+   depends on KERNEL_MODE_NEON && !PREEMPT_RT_BASE
    select CRYPTO_HASH
    select CRYPTO_SHA1

Sebastian, can you piont to where sha1 (say) hits this issue?
I wonder whether this is really a sign that some refactoring is needed.

I disabled all NEON in one go. Looking at this, it shouldn't be a issue
with the block-walk. The only thing that might be a problem is that it
can do multiple blocks in one go.

Cheers
---Dave

Sebastian