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Date:   Tue, 12 Apr 2022 11:20:08 +0100
From:   Catalin Marinas <catalin.marinas@arm.com>
To:     Herbert Xu <herbert@gondor.apana.org.au>
Cc:     Ard Biesheuvel <ardb@kernel.org>, Will Deacon <will@kernel.org>,
        Marc Zyngier <maz@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org,
        "David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH 07/10] crypto: Use ARCH_DMA_MINALIGN instead of
 ARCH_KMALLOC_MINALIGN
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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