!9628 m68k: Fix spinlock race in kernel thread creation

Merge Pull Request from: @ci-robot 
 
PR sync from: Wang Wensheng <wangwensheng4@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/NZFDPZW4R7ZY5FSCZOKXOBYO3MX2UMGO/ 
 
https://gitee.com/src-openeuler/kernel/issues/IA6SFZ 
 
Link:https://gitee.com/openeuler/kernel/pulls/9628

 

Reviewed-by: Weilong Chen <chenweilong@huawei.com>
Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>