stop_machine: mask sdei before running the callback

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8LQCC



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Kprobes use 'stop_machine' to modify code which could be ran in the
sdei_handler at the same time. This patch mask sdei before running the
stop_machine callback to avoid this race condition.

Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Wei Li <liwei391@huawei.com>
Reviewed-by: Cheng Jian <cj.chengjian@huawei.com>