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Put cgroup_tryget_css() inside CONFIG_CGROUP_SCHED to fix the warning of 'cgroup_tryget_css' defined but not used [-Wunused-function] when CONFIG_CGROUP_SCHED is disabled. Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Reviewed-by: Kamalesh Babulal <kamalesh.babulal@oracle.com> Signed-off-by: Tejun Heo <tj@kernel.org>