From: Aleksa Sarai <cyphar@cyphar.com>
Date: Sat, 6 Jun 2015 00:02:14 +0000 (+1000)
Subject: cgroup: use bitmask to filter for_each_subsys
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~116^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cb4a31675270;p=pandora-kernel.git

cgroup: use bitmask to filter for_each_subsys

Add a new macro for_each_subsys_which that allows all enabled cgroup
subsystems to be filtered by a bitmask, such that mask & (1 << ssid)
determines if the subsystem is to be processed in the loop body (where
ssid is the unique id of the subsystem).

Also replace the need_forkexit_callback with two separate bitmasks for
each callback to make (ss->{fork,exit}) checks unnecessary.

tj: add a short comment for "if (!CGROUP_SUBSYS_COUNT)".

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
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