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

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Message-ID: <YmELUguCXdxhK9ek@infradead.org>
Date:   Thu, 21 Apr 2022 00:44:18 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        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 Thu, Apr 21, 2022 at 09:36:46AM +0200, Arnd Bergmann wrote:
> Does this work on all 32-bit architectures as well? I see that you added
> swiotlb for ARM LPASE systems in 2019, but I don't know if that has any
> additional requirements for the other 32-bit architectures that don't
> select SWIOTLB today.

We'll need to call swiotlb_init for all these cases, but there is no other
fundamental requirement.  We can probably do with a way smaller buffer
if bouncing is only needed for misaligned allocations.