[PATCH 1/2] cgroup: Remove wrong comment on cgroup_enable_task_cg_list()

From: Frederic Weisbecker
Date: Tue Feb 07 2012 - 21:37:42 EST

Remove the stale comment about RCU protection. Many callers
(all of them?) of cgroup_enable_task_cg_list() don't seem
to be in an RCU read side critical section. Besides, RCU is
not helpful to protect against while_each_thread().

Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Li Zefan <lizf@xxxxxxxxxxxxxx>
Cc: Mandeep Singh Baines <msb@xxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
kernel/cgroup.c | 3 ---
1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 865d89a..6e4eb43 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2701,9 +2701,6 @@ static void cgroup_advance_iter(struct cgroup *cgrp,
* using their cgroups capability, we don't maintain the lists running
* through each css_set to its tasks until we see the list actually
* used - in other words after the first call to cgroup_iter_start().
- *
- * The tasklist_lock is not held here, as do_each_thread() and
- * while_each_thread() are protected by RCU.
static void cgroup_enable_task_cg_lists(void)

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