smp: Cleanup smp_call_function*()

mainline inclusion
from mainline-v5.11-rc1
commit 545b8c8d
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I3ZV2C


CVE: NA

-------------------------------------------------

Get rid of the __call_single_node union and cleanup the API a little
to avoid external code relying on the structure layout as much.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>

conflict:
	kernel/debug/debug_core.c
	kernel/sched/core.c
	kernel/smp.c: fix csd_lock_wait_getcpu() csd->node.dst

Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>
Reviewed-by: Chen Wandun <chenwandun@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>