linux-kernel - Re: [PATCH 4/4] crypto: arm64/crc32 - remove PMULL based CRC32 driver

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Message-ID: <20180904052109.bprmzgstknh6yecz@gondor.apana.org.au>
Date:   Tue, 4 Sep 2018 13:21:09 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
        will.deacon@....com, catalin.marinas@....com, ebiggers@...gle.com,
        suzuki.poulose@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] crypto: arm64/crc32 - remove PMULL based CRC32 driver

On Mon, Aug 27, 2018 at 01:02:45PM +0200, Ard Biesheuvel wrote:
> Now that the scalar fallbacks have been moved out of this driver into
> the core crc32()/crc32c() routines, we are left with a CRC32 crypto API
> driver for arm64 that is based only on 64x64 polynomial multiplication,
> which is an optional instruction in the ARMv8 architecture, and is less
> and less likely to be available on cores that do not also implement the
> CRC32 instructions, given that those are mandatory in the architecture
> as of ARMv8.1.
> 
> Since the scalar instructions do not require the special handling that
> SIMD instructions do, and since they turn out to be considerably faster
> on some cores (Cortex-A53) as well, there is really no point in keeping
> this code around so let's just remove it.
> 
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>

Patch applied.  Thanks.
-- 
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