linux-kernel - Re: [PATCH 07/10] crypto: Use ARCH_DMA_MINALIGN instead of ARCH_KMALLOC

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Message-ID: <Yk5/FpCR10sndTR1@n131-248-037.byted.org>
Date:   Thu, 7 Apr 2022 14:14:15 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 07/10] crypto: Use ARCH_DMA_MINALIGN instead of
 ARCH_KMALLOC_MINALIGN

On Tue, Apr 05, 2022 at 02:57:55PM +0100, Catalin Marinas wrote:
> ARCH_DMA_MINALIGN represents the minimum (static) alignment for safe DMA
> operations while ARCH_KMALLOC_MINALIGN is the minimum kmalloc() objects
> alignment.
> 
> Signed-off-by: Catalin Marinas <catalin.marinas@....com>
> Cc: Herbert Xu <herbert@...dor.apana.org.au>
> Cc: "David S. Miller" <davem@...emloft.net>
> ---
>  include/linux/crypto.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/crypto.h b/include/linux/crypto.h
> index 2324ab6f1846..654b9c355575 100644
> --- a/include/linux/crypto.h
> +++ b/include/linux/crypto.h
> @@ -167,7 +167,7 @@
>   * maintenance for non-coherent DMA (cache invalidation in particular) does not
>   * affect data that may be accessed by the CPU concurrently.
>   */
> -#define CRYPTO_MINALIGN ARCH_KMALLOC_MINALIGN
> +#define CRYPTO_MINALIGN ARCH_DMA_MINALIGN
>

I don't think this should be changed since ARCH_KMALLOC_MINALIGN is
already aligned with the size what you need.

Thanks.