UPSTREAM: sched/fair: Fixup wake_up_sync() vs DELAYED_DEQUEUE

[ Upstream commit aa3ee4f0 ]

Delayed dequeued feature keeps a sleeping task enqueued until its
lag has elapsed. As a result, it stays also visible in rq->nr_running.
So when in wake_affine_idle(), we should use the real running-tasks
in rq to check whether we should place the wake-up task to
current cpu.
On the other hand, add a helper function to return the nr-delayed.

Fixes: 152e11f6 ("sched/fair: Implement delayed dequeue")
Change-Id: I239b550c02cfb46651cd44f698c2b3ba21ef4049
Signed-off-by: Xuewen Yan <xuewen.yan@unisoc.com>
Reviewed-and-tested-by: Tianchen Ding <dtcccc@linux.alibaba.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lore.kernel.org/r/20250303105241.17251-2-xuewen.yan@unisoc.com


Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit a2562bdd)
Bug: 437846539
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>