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sched/proxy: Switch proxy to use p->is_blocked
Rather than gate the proxy paths with p->blocked_on, use p->is_blocked. This opens up the state: '->is_blocked && !->blocked_on' for future use. Notably, only proxy and delayed tasks can be ->on_rq && ->is_blocked, and it is guaranteed that sched_class::pick_task() will never return a delayed task. Therefore any task returned from pick_next_task() that has ->is_blocked set, must be a proxy task. Suggested-by: K Prateek Nayak <kprateek.nayak@amd.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://patch.msgid.link/20260526113322.477954312%40infradead.org
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