Re: [PATCH 07/10] crypto: Use ARCH_DMA_MINALIGN instead of ARCH_KMALLOC_MINALIGN

Catalin Marinas
2022-04-12T11:38:43Z

On Tue, Apr 12, 2022 at 11:02:54AM +0100, Catalin Marinas wrote:
> On Tue, Apr 12, 2022 at 05:40:58PM +0800, Herbert Xu wrote:
> > I think if CRYPTO_MINALIGN makes those drivers work then so
> > should cra_alignmask. And that would be a relatively easy
> > patch to do.
>
> Yes, the patch would be simple, subject to figuring out which drivers
> and what alignment they actually need (any help appreciated).
>
> There are already arm64 vendor kernels that change ARCH_DMA_MINALIGN to
> 64, hence ARCH_KMALLOC_MINALIGN and CRYPTO_MINALIGN become 64. We also
> discussed a Kconfig option for this in the past. Would that have broken
> any crypto drivers that rely on a strict 128 byte alignment?

Actually, I think with a cra_alignmask of 127 (the arm64
CRYPTO_MINALIGN-1), crypto_check_alg() will fail since
MAX_ALGAPI_ALIGNMASK is 63.

--
Catalin