sched: Add rq::ttwu_pending
In preparation of removing rq->wake_list, replace the !list_empty(rq->wake_list) with rq->ttwu_pending. This is not fully equivalent as this new variable is racy. Signed-off-by:Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by:
Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20200526161908.070399698@infradead.org
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