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Date: Wed, 1 Jun 2016 10:07:07 +0900
From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: Minchan Kim <minchan@kernel.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>, linux-kernel@vger.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Subject: Re: [PATCH v2 4/8] zram: use crypto api to check alg availability
Message-ID: <20160601010707.GB461@swordfish>
References: <20160531122017.2878-1-sergey.senozhatsky@gmail.com>
 <20160531122017.2878-5-sergey.senozhatsky@gmail.com>
 <20160601000304.GF19976@bbox>
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Hello Minchan,

On (06/01/16 09:03), Minchan Kim wrote:
[..]
> So, if we do 'cat /sys/block/zram0/comp_algorithm", every crypto modules
> in the backend array are loaded in memory and not unloaded until admin
> executes rmmod? Right?

yes, I think so.

[..]
> If user load out-of-tree crypto compression module, what's status of
> comp_algorithm?
> 
> #> insmod foo_crypto.ko
> #> echo foo > /sys/block/zram0/comp_algorithm
> #> cat /sys/block/zram0/comp_algorithm
> lzo lz4 [foo]
> ?

yes, "lzo lz4 [out-of-tree-module-name]".

	-ss