linux-kernel - Re: [PATCH] crypto: tcrypt: add option to not exit on success

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Message-ID: <20090513113819.GA15662@gondor.apana.org.au>
Date:	Wed, 13 May 2009 21:38:19 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Neil Horman <nhorman@...driver.com>
Cc:	Jarod Wilson <jarod@...hat.com>, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: tcrypt: add option to not exit on success

On Wed, May 13, 2009 at 07:08:26AM -0400, Neil Horman wrote:
>
> Not really sure I agree with the logic here.  I agree that its pretty clear that
> its major value is for quickly testing all the algorithms in a system, but
> universally failing the loading of the module simply to save a few milliseconds
> seems like a poor choice.  In so doing you create an alias effect, as jarod
> noted between a non-existent module and a module that failed to load.  The
> aliasing can be resolved, if you want to parse dmesg, but if speed is the issue
> at hand, that parsing is a significant impact.  If you allow the module to load
> properly, then for the cost of an rmmod, you can tell simply from the exit code
> of modprobe:
> 1) If the module was found 
> 2) If the tests passed

As I said, tcrypt should no longer be used to test algorithms.
Algorithms are tested as they load, with the result available
in /proc/crypto.  tcrypt is just a relic that will be going away.

Do not rely on it.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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