maillist inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6PKGM

Reference: https://lore.kernel.org/linux-mm/20220824071909.192535-1-wangkefeng.wang@huawei.com/

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The pgdat->kswapd could be accessed concurrently by kswapd_run() and
kcompactd(), it don't be protected by any lock, which could leads to
data races, adding READ/WRITE_ONCE() to slince it.
Signed-off-by: NKefeng Wang <wangkefeng.wang@huawei.com>

Conflicts:
	mm/compaction.c
	mm/vmscan.c
Signed-off-by: NZhangPeng <zhangpeng362@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NJialin Zhang <zhangjialin11@huawei.com>