linux-kernel - Re: [PATCH v9 3/4] cgroups: allow a cgroup subsystem to reject a fork

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Message-ID: <20150413142439.GA2596@htj.duckdns.org>
Date:	Mon, 13 Apr 2015 10:24:39 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Aleksa Sarai <cyphar@...har.com>
Cc:	lizefan@...wei.com, mingo@...hat.com, peterz@...radead.org,
	richard@....at, fweisbec@...il.com, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org
Subject: Re: [PATCH v9 3/4] cgroups: allow a cgroup subsystem to reject a fork

On Sun, Apr 12, 2015 at 10:51:56AM +1000, Aleksa Sarai wrote:
> +/* list of all tags for subsystems */
> +enum cgroup_subsys_tag {
> +#define TAG_ID(_t) CGROUP_ ## _t
> +#define SUBSYS(_x) UNUSED_IDENT(_x),
> +#define TAG(_t) TAG_ID(_t), \
> +	UNUSED_IDENT(_t) = TAG_ID(_t) - 2,
> +#define _COUNT(_t, _i) _i, \
> +	CGROUP_ ## _t ## _COUNT = (TAG_ID(_t ## _END) - TAG_ID(_t ## _START)) + 1, \
> +	UNUSED_IDENT(_t) = _i - 1,
> +#define COUNT(_t) _COUNT(_t, UNUSED_IDENT(_t))
> +#include <linux/cgroup_subsys.h>
> +#undef COUNT
> +#undef TAG
> +#undef SUBSYS
> +#undef TAG_ID
> +};

Ummm... is this really necessary?  Can't we do something like the
following?

#define SUBSYS_TAG(tag)						\
	__##tag,						\
	tag = __##tag - 2,

-- 
tejun
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