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Commit 45531757 authored by Daniel Lezcano's avatar Daniel Lezcano Committed by Linus Torvalds
Browse files

cgroup: notify ns_cgroup deprecated 



The ns_cgroup will be removed very soon.  Let's warn, for this version,
ns_cgroup is deprecated.

Make ns_cgroup and clone_children exclusive.  If the clone_children is set
and the ns_cgroup is mounted, let's fail with EINVAL when the ns_cgroup
subsys is created (a printk will help the user to understand why the
creation fails).

Update the feature remove schedule file with the deprecated ns_cgroup.

Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@free.fr>
Acked-by: default avatarPaul Menage <menage@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f4a2589f

Documentation/feature-removal-schedule.txt

+17 −0
Original line number Diff line number Diff line
@@ -526,6 +526,23 @@ Who: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> 


----------------------------



What:   namespace cgroup (ns_cgroup)

When:   2.6.38

Why:    The ns_cgroup leads to some problems:

	* cgroup creation is out-of-control

	* cgroup name can conflict when pids are looping

	* it is not possible to have a single process handling

	a lot of namespaces without falling in a exponential creation time

	* we may want to create a namespace without creating a cgroup



	The ns_cgroup is replaced by a compatibility flag 'clone_children',

	where a newly created cgroup will copy the parent cgroup values.

	The userspace has to manually create a cgroup and add a task to

	the 'tasks' file.

Who:    Daniel Lezcano <daniel.lezcano@free.fr>



----------------------------



What:	iwlwifi disable_hw_scan module parameters

When:	2.6.40

Why:	Hareware scan is the prefer method for iwlwifi devices for

kernel/ns_cgroup.c

+8 −0
Original line number Diff line number Diff line
@@ -85,6 +85,14 @@ static struct cgroup_subsys_state *ns_create(struct cgroup_subsys *ss, 
		return ERR_PTR(-EPERM);

	if (!cgroup_is_descendant(cgroup, current))

		return ERR_PTR(-EPERM);

	if (test_bit(CGRP_CLONE_CHILDREN, &cgroup->flags)) {

		printk("ns_cgroup can't be created with parent "

		       "'clone_children' set.\n");

		return ERR_PTR(-EINVAL);

	}



	printk_once("ns_cgroup deprecated: consider using the "

		    "'clone_children' flag without the ns_cgroup.\n");



	ns_cgroup = kzalloc(sizeof(*ns_cgroup), GFP_KERNEL);

	if (!ns_cgroup)