sched/fair: Mark tg_is_idle() an inline in the !CONFIG_FAIR_GROUP_SCHED case
It's not actually used in the !CONFIG_FAIR_GROUP_SCHED case: kernel/sched/fair.c:488:12: warning: ‘tg_is_idle’ defined but not used [-Wunused-function] Keep around a placeholder nevertheless, for API completeness. Mark it inline, so the compiler doesn't think it must be used. Fixes: 30400039: ("sched: Cgroup SCHED_IDLE support") Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Josh Don <joshdon@google.com> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Vincent Guittot <vincent.guittot@linaro.org>
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