[PATCH 2/2] crypto: arm/aes-neonbs - stop using the SIMD helper

[Eric Biggers]

On Wed, Apr 02, 2025 at 09:02:53AM +0200, Ard Biesheuvel wrote:
> From: Ard Biesheuvel <ardb at kernel.org>
> 
> Now that ARM permits use of the NEON unit in softirq context as well as
> task context, there is no longer a need to rely on the SIMD helper
> module to construct async skciphers wrapping the sync ones, as the
> latter can always be called directly.
> 
> So remove these wrappers and the dependency on the SIMD helper. This
> permits the use of these algorithms by callers that only support
> synchronous use.
> 
> Signed-off-by: Ard Biesheuvel <ardb at kernel.org>
> ---
>  arch/arm/crypto/Kconfig           |   1 -
>  arch/arm/crypto/aes-neonbs-glue.c | 114 +++---------------------------
>  2 files changed, 9 insertions(+), 106 deletions(-)
> 
> diff --git a/arch/arm/crypto/Kconfig b/arch/arm/crypto/Kconfig
> index 2fa8aba8dc12..ba1d1b67c727 100644
> --- a/arch/arm/crypto/Kconfig
> +++ b/arch/arm/crypto/Kconfig
> @@ -169,7 +169,6 @@ config CRYPTO_AES_ARM_BS
>  	select CRYPTO_AES_ARM
>  	select CRYPTO_SKCIPHER
>  	select CRYPTO_LIB_AES
> -	select CRYPTO_SIMD
>  	help
>  	  Length-preserving ciphers: AES cipher algorithms (FIPS-197)
>  	  with block cipher modes:
> diff --git a/arch/arm/crypto/aes-neonbs-glue.c b/arch/arm/crypto/aes-neonbs-glue.c
> index f6be80b5938b..63800257a7ea 100644
> --- a/arch/arm/crypto/aes-neonbs-glue.c
> +++ b/arch/arm/crypto/aes-neonbs-glue.c

The following includes can now be removed from this file:

    #include <crypto/ctr.h>
    #include <crypto/internal/simd.h>

Otherwise this patch looks good.  Thanks!

Reviewed-by: Eric Biggers <ebiggers at kernel.org>

- Eric