linux-kernel - Re: [PATCH] crypto: caam - enable hash api only on ARM platforms per default

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Message-ID: <20240710065104.q5qh2bmf3r7wi7bz@pengutronix.de>
Date: Wed, 10 Jul 2024 08:51:04 +0200
From: Marco Felsch <m.felsch@...gutronix.de>
To: Herbert Xu <herbert@...dor.apana.org.au>
Cc: Horia Geanta <horia.geanta@....com>,
	Pankaj Gupta <pankaj.gupta@....com>,
	Gaurav Jain <gaurav.jain@....com>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] crypto: caam - enable hash api only on ARM platforms per
 default

On 24-07-10, Herbert Xu wrote:
> On Tue, Jul 09, 2024 at 10:54:54AM +0200, Marco Felsch wrote:
> >
> > We had an patch exactly doing this but depending on the SoC the default
> > prio may valid since the CAAM is used on ARMv7 and ARMv8 NXP SoCs. To
> > not cause any regression we went this way.
> 
> I don't understand.  Why not just set the priority depending on
> IS_ENABLED(CONFIG_ARM)? 

Argh.. you're right. I had something other in my mind, sry.

> That way it's strictly better than the Kconfig patch:
> 
> 1) If the driver is indeed slower then you'd have achieved the same
> result of preferring the non-driver algorithm.
> 
> 2) If the driver ends up being faster then at least the admin can
> adjust the priorities.
> 
> Or perhaps your Kconfig option should set the priority.

NACK since no admin knows the prios. I will go with the "IS_ENABLED"
solution, thank you!

Regards,
  Marco

> 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
>