linux-kernel - Re: [PATCH 0/4] arm64: wire CRC32 instructions into core crc32 routines

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Message-ID: <20180827145352.GF2311@thunk.org>
Date:   Mon, 27 Aug 2018 10:53:52 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
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,
        herbert@...dor.apana.org.au, ebiggers@...gle.com,
        suzuki.poulose@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] arm64: wire CRC32 instructions into core crc32
 routines

On Mon, Aug 27, 2018 at 01:02:41PM +0200, Ard Biesheuvel wrote:
> While this is not known to cause performance issues, calling a table based
> time variant implementation with a non-negligible D-cache footprint (8 KB)
> is wasteful in any case, and now that the crc32 instructions have been made
> mandatory in the architecture, let's wire them up into the core crc routines.

Stupid question --- are there any arm64 SOC's out there which do *not*
have the crc32 instructions?  Presumably there won't be in the future,
because it's now mandatory --- but where there any in the past?

	     	 	       	   	 - Ted