sched: Wrap rq::lock access

mainline inclusion
from mainline-v5.14-rc1
commit 5cb9eaa3
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5OOWG
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5cb9eaa3d274f75539077a28cf01e3563195fa53



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In preparation of playing games with rq->lock, abstract the thing
using an accessor.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Don Hiatt <dhiatt@digitalocean.com>
Tested-by: Hongyu Ning <hongyu.ning@linux.intel.com>
Tested-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lkml.kernel.org/r/20210422123308.136465446@infradead.org


Conflicts:
	kernel/sched/core.c
	[Bugfix a7c81556("sched: Fix migrate_disable() vs rt/dl balancing")
	 is not applied.
	 Bugfix 565790d2("sched: Fix balance_callback()") is not applied.
	 Bugfix ae792702("sched: Optimize finish_lock_switch()") is not applied.
	 Bugfix 36c6e17b("sched/core: Print out straggler tasks in sched_cpu_dying()")
	 is not applied.
	 Feature 2558aacf("sched/hotplug: Ensure only per-cpu kthreads run
	 during hotplug") is not applied.
	 Feature f2469a1f("sched/core: Wait for tasks being pushed away on hotplug")
	 is not applied.]

	kernel/sched/deadline.c
	[Bugfix a7c81556("sched: Fix migrate_disable() vs rt/dl balancing")
	 is not applied.]

	kernel/sched/fair.c
	[Feature acf66d70("sched/fair: Provide can_migrate_task_llc")
	 Feature 0826530d("sched/fair: Remove update of blocked load from newidle_balance")
	 s not applied.
	 Feature 6864cf01("sched/fair: Steal work from an overloaded CPU when CPU goes idle")]

	kernel/sched/rt.c
	[Bugfix a7c81556("sched: Fix migrate_disable() vs rt/dl balancing")
	 is not applied.]

	kernel/sched/sched.h
	[[Bugfix a7c81556("sched: Fix migrate_disable() vs rt/dl balancing")
	 is not applied.]
Signed-off-by: Lin Shengwang <linshengwang1@huawei.com>
Reviewed-by: lihua <hucool.lihua@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>