diff options
author | Tejun Heo <tj@kernel.org> | 2014-05-07 21:31:17 -0400 |
---|---|---|
committer | Tejun Heo <tj@kernel.org> | 2014-05-13 11:26:27 -0400 |
commit | 5024ae29cd285ce9e736776414da645d3a91828c (patch) | |
tree | 0afef891029af86947869d25b8a3c0e10b6ead69 /include/xen/xenbus.h | |
parent | 36c38fb7144aa941dc072ba8f58b2dbe509c0345 (diff) | |
download | linux-5024ae29cd285ce9e736776414da645d3a91828c.tar.bz2 |
cgroup: introduce task_css_is_root()
Determining the css of a task usually requires RCU read lock as that's
the only thing which keeps the returned css accessible till its
reference is acquired; however, testing whether a task belongs to the
root can be performed without dereferencing the returned css by
comparing the returned pointer against the root one in init_css_set[]
which never changes.
Implement task_css_is_root() which can be invoked in any context.
This will be used by the scheduled cgroup_freezer change.
v2: cgroup no longer supports modular controllers. No need to export
init_css_set. Pointed out by Li.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Diffstat (limited to 'include/xen/xenbus.h')
0 files changed, 0 insertions, 0 deletions