linux-kernel - Re: [PATCH 1/2] crypto: export crypto_alg

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Message-ID: <20150813031954.GA19481@gondor.apana.org.au>
Date:	Thu, 13 Aug 2015 11:19:54 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Joonsoo Kim <js1304@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>,
	Nitin Gupta <ngupta@...are.org>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Stephan Mueller <smueller@...onox.de>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH 1/2] crypto: export crypto_alg_list and rwsem

On Thu, Aug 13, 2015 at 11:24:13AM +0900, Joonsoo Kim wrote:
> Until now, zram uses compression algorithm through direct call
> to core algorithm function, but, it has drawback that we need to add
> compression algorithm manually to zram. If we don't do that, we cannot
> utilize various compression algorithms in the system. To improve this
> situation, zram will be changed to use crypto subsystem in following
> patch. There is one problem with this change. Zram has a interface
> that what compression algorithm it can support. Although crypto subsystem
> has /proc interface to search all of crypto algorithm, but, there is
> no way to get just compression algorithm in cryto subsystem. To implement
> it on zram-side, crypto_alg_list and rwsem should be exported so
> this patch do it.
> 
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Nack.  We already have a netlink interface that can be used to
query algorithms and the type information is present in the report.
The interface is crypto_user and should be used instead of exporting
the raw list.

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
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