cgroup, cpuset: don't use ss->pre_attach()

->pre_attach() is supposed to be called before migration, which is
observed during process migration but task migration does it the other
way around.  The only ->pre_attach() user is cpuset which can do the
same operaitons in ->can_attach().  Collapse cpuset_pre_attach() into
cpuset_can_attach().

-v2: Patch contamination from later patch removed.  Spotted by Paul
     Menage.

Signed-off-by: Tejun Heo <[email protected]>
Reviewed-by: Frederic Weisbecker <[email protected]>
Acked-by: Paul Menage <[email protected]>
Cc: Li Zefan <[email protected]>

0 files changed, 0 insertions, 0 deletions