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sched_ext will soon add cgroup cpu.weigh support. The cgroup interface code is currently gated behind CONFIG_FAIR_GROUP_SCHED. As the fair class and/or SCX may implement the feature, put the interface code behind the new CONFIG_CGROUP_SCHED_WEIGHT which is selected by CONFIG_FAIR_GROUP_SCHED. This allows either sched class to enable the itnerface code without ading more complex CONFIG tests. When !CONFIG_FAIR_GROUP_SCHED, a dummy version of sched_group_set_shares() is added to support later CONFIG_CGROUP_SCHED_WEIGHT && !CONFIG_FAIR_GROUP_SCHED builds. No functional changes. Signed-off-by: Tejun Heo <tj@kernel.org>