linux-kernel - Re: [PATCH 0/10] crypto: Driver conversions for DMA alignment

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Date:   Tue, 6 Dec 2022 16:34:11 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        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>,
        LinuxKernelMailingList@...dor.apana.org.au,
        linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>
Subject: Re: [PATCH 0/10] crypto: Driver conversions for DMA alignment

On Mon, Dec 05, 2022 at 10:27:58PM -0800, Christoph Hellwig wrote:
.
> But GFP_DMA never did do anything at all about alignment.  It picks
> allocations from ZONE_DMA (which on x86 is the first 16MB only).

Right.  I'm not arguing that they are correct or anything.  I'm
just saying that they are currently working on arm64 because of
the large minimum kmalloc alignment, and they will all be broken
afterwards.

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