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

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Message-ID: <CAOviyajqc_ip2Lpa5NTLLXxQ7JghYXg1UL3vXDdpbbnhmsfXEQ@mail.gmail.com>
Date:	Tue, 14 Apr 2015 10:33:41 +1000
From:	Aleksa Sarai <cyphar@...har.com>
To:	Tejun Heo <tj@...nel.org>
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

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
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.

--
Aleksa Sarai (cyphar)
www.cyphar.com
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