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

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Message-ID: <YlvRbvWSWMTtBJiN@gondor.apana.org.au>
Date:   Sun, 17 Apr 2022 16:35:58 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Ard Biesheuvel <ardb@...nel.org>, 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 Memory Management List <linux-mm@...ck.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 07/10] crypto: Use ARCH_DMA_MINALIGN instead of
 ARCH_KMALLOC_MINALIGN

On Sun, Apr 17, 2022 at 09:31:09AM +0100, Catalin Marinas wrote:
>
> Not with my series, the non-sharing of cache lines is preserved.
> kmalloc() still returns objects aligned to a cache-line.
> ARCH_DMA_MINALIGN was chosen as the cover-all value for all SoCs
> supported but I want to reduce the kmalloc() alignment to a cache line
> size if a platform has a cache line smaller than ARCH_DMA_MINALIGN (most
> arm64 SoCs have a cache line of 64 bytes rather than 128).

OK, but then you don't need to play with CRYPTO_MINALIGN at all,
right? All you need to do is add the padding between the Crypto
API fields and the context structure, right?

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt