Currently pcpu_mem_alloc() is implemented always return zeroed memory.
So rename it to make user like pcpu_get_pages_and_bitmap() know don't
reinit it.
Signed-off-by: NBob Liu <lliubbo@gmail.com>
Reviewed-by: NPekka Enberg <penberg@kernel.org>
Reviewed-by: NMichal Hocko <mhocko@suse.cz>
Signed-off-by: NTejun Heo <tj@kernel.org>