linux-kernel - Re: [PATCH 09/23] cgroup: add subsys backlink pointer to cftype

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Message-ID: <20130805124951.GB2274@redhat.com>
Date:	Mon, 5 Aug 2013 08:49:51 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	lizefan@...wei.com, containers@...ts.linux-foundation.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH 09/23] cgroup: add subsys backlink pointer to cftype

On Thu, Aug 01, 2013 at 05:49:47PM -0400, Tejun Heo wrote:
> cgroup is transitioning to using css (cgroup_subsys_state) instead of
> cgroup as the primary subsystem handle.  The cgroupfs file interface
> will be converted to use css's which requires finding out the
> subsystem from cftype so that the matching css can be determined from
> the cgroup.
> 
> This patch adds cftype->ss which points to the subsystem the file
> belongs to.  The field is initialized while a cftype is being
> registered.  This makes it unnecessary to explicitly specify the
> subsystem for other cftype handling functions.  @ss argument dropped
> from various cftype handling functions.
> 
> This patch shouldn't introduce any behavior differences.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Vivek Goyal <vgoyal@...hat.com>
> Cc: Jens Axboe <axboe@...nel.dk>
> ---
>  block/blk-cgroup.c     |  2 +-

blk-cgroup bits are simple here. Ack for these.

Acked-by: Vivek Goyal <vgoyal@...hat.com>

Vivek
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