cgroups: fix API thinko

Add cgroup_attach_task_all()

The existing cgroup_attach_task_current_cg() API is called by a thread to
attach another thread to all of its cgroups; this is unsuitable for cases
where a privileged task wants to attach itself to the cgroups of a less
privileged one, since the call must be made from the context of the target
task.

This patch adds a more generic cgroup_attach_task_all() API that allows
both the source task and to-be-moved task to be specified.
cgroup_attach_task_current_cg() becomes a specialization of the more
generic new function.

[[email protected]: rewrote changelog]
[[email protected]: address reviewer comments]
Signed-off-by: Michael S. Tsirkin <[email protected]>
Tested-by: Alex Williamson <[email protected]>
Acked-by: Paul Menage <[email protected]>
Cc: Li Zefan <[email protected]>
Cc: Ben Blum <[email protected]>
Cc: Sridhar Samudrala <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions