linux-kernel - Re: [PATCH 4/8] cgroup: export cgroup_get() and cgroup

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Date:	Tue, 24 Nov 2015 11:30:56 -0500
From:	Tejun Heo <tj@...nel.org>
To:	serge@...lyn.com
Cc:	linux-kernel@...r.kernel.org, adityakali@...gle.com,
	linux-api@...r.kernel.org, containers@...ts.linux-foundation.org,
	cgroups@...r.kernel.org, lxc-devel@...ts.linuxcontainers.org,
	akpm@...ux-foundation.org, ebiederm@...ssion.com
Subject: Re: [PATCH 4/8] cgroup: export cgroup_get() and cgroup_put()

Hello,

On Mon, Nov 16, 2015 at 01:51:41PM -0600, serge@...lyn.com wrote:
> From: Aditya Kali <adityakali@...gle.com>
> 
> move cgroup_get() and cgroup_put() into cgroup.h so that
> they can be called from other places.
> 
> Signed-off-by: Aditya Kali <adityakali@...gle.com>
> Acked-by: Serge Hallyn <serge.hallyn@...onical.com>
> ---
>  include/linux/cgroup.h |   21 +++++++++++++++++++++
>  kernel/cgroup.c        |   22 ----------------------
>  2 files changed, 21 insertions(+), 22 deletions(-)
> 
> diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
> index 29f0b02..99096be 100644
> --- a/include/linux/cgroup.h
> +++ b/include/linux/cgroup.h
> @@ -231,6 +231,27 @@ void css_task_iter_end(struct css_task_iter *it);
>  #define css_for_each_descendant_post(pos, css)				\
>  	for ((pos) = css_next_descendant_post(NULL, (css)); (pos);	\
>  	     (pos) = css_next_descendant_post((pos), (css)))

Please insert a blank line here.

> +/* convenient tests for these bits */

And I don't think the comment makes sense here.

> +static inline bool cgroup_is_dead(const struct cgroup *cgrp)
> +{
> +	return !(cgrp->self.flags & CSS_ONLINE);
> +}
> +
> +static inline void cgroup_get(struct cgroup *cgrp)
> +{
> +	WARN_ON_ONCE(cgroup_is_dead(cgrp));
> +	css_get(&cgrp->self);
> +}
> +
> +static inline bool cgroup_tryget(struct cgroup *cgrp)
> +{
> +	return css_tryget(&cgrp->self);
> +}
> +
> +static inline void cgroup_put(struct cgroup *cgrp)
> +{
> +	css_put(&cgrp->self);
> +}

So these are being exposed for cgroup NS support.  Hmmm... idk, does
cgroup NS support needs to be in a spearate file?  The added amount
isn't that big.  If we split cgroup.c, I'd much prefer to have
cgroup-internal.h for internally shared stuff than pushing them out to
cgroup.h.

Thanks.

-- 
tejun
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