linux-kernel - [RFC][PATCH v7 09/14] cgroup: move CSS_ID

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Message-Id: <1305276473-14780-10-git-send-email-gthelen@google.com>
Date:	Fri, 13 May 2011 01:47:48 -0700
From:	Greg Thelen <gthelen@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	containers@...ts.osdl.org, linux-fsdevel@...r.kernel.org,
	Andrea Righi <arighi@...eler.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Minchan Kim <minchan.kim@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Ciju Rajan K <ciju@...ux.vnet.ibm.com>,
	David Rientjes <rientjes@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Dave Chinner <david@...morbit.com>,
	Greg Thelen <gthelen@...gle.com>
Subject: [RFC][PATCH v7 09/14] cgroup: move CSS_ID_MAX to cgroup.h

This allows users of css_id() to know the largest possible css_id value.
This knowledge can be used to build per-cgroup bitmaps.

Signed-off-by: Greg Thelen <gthelen@...gle.com>
---
 include/linux/cgroup.h |    1 +
 kernel/cgroup.c        |    1 -
 2 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index ab4ac0c..5eb6543 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -624,6 +624,7 @@ bool css_is_ancestor(struct cgroup_subsys_state *cg,
 		     const struct cgroup_subsys_state *root);
 
 /* Get id and depth of css */
+#define CSS_ID_MAX	(65535)
 unsigned short css_id(struct cgroup_subsys_state *css);
 unsigned short css_depth(struct cgroup_subsys_state *css);
 struct cgroup_subsys_state *cgroup_css_from_dir(struct file *f, int id);
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 2731d11..ab7e7a7 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -129,7 +129,6 @@ static struct cgroupfs_root rootnode;
  * CSS ID -- ID per subsys's Cgroup Subsys State(CSS). used only when
  * cgroup_subsys->use_id != 0.
  */
-#define CSS_ID_MAX	(65535)
 struct css_id {
 	/*
 	 * The css to which this ID points. This pointer is set to valid value
-- 
1.7.3.1

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