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

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Date:	Tue, 14 Apr 2015 08:17:32 -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,
	Frédéric Weisbecker <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

Hello,

On Tue, Apr 14, 2015 at 10:33:41AM +1000, Aleksa Sarai wrote:
> Hi Tejun,
> 
> > Ummm... is this really necessary?  Can't we do something like the
> > following?
> >
> > #define SUBSYS_TAG(tag)                                         \
> >         __##tag,                                                \
> >         tag = __##tag - 2,
> 
> Is which part necessary? That's what TAG() does. I can remove the

The complex macros.

> UNUSED_IDENT() if you want, that was just to make sure you don't get clashes
> with other unused idents. COUNT() is so that we don't have to manually add
> CGROUP_<TAG>_COUNT for every tag we add.

Let's please do the simple thing.  It just takes one two-liner macro.

Thanks.

-- 
tejun
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