!3629 x86/kdump: make crash kernel boot faster

Merge Pull Request from: @ci-robot 
 
PR sync from: zhangnaichuan <zhangnaichuan@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/SNQHJG7ITXAZSZSI7D2R7HMYMNGIQUKM/ 
description:
If other cpus offline before handle the crash NMI, the
waiting_for_crash_ipi can not be decreased to 0, and
current cpu will wait 1 second. So break if all other
cpus offline.


-- 
2.33.0
 
https://gitee.com/openeuler/kernel/issues/I8RJ6X?from=project-issue 
 
Link:https://gitee.com/openeuler/kernel/pulls/3629

 

Reviewed-by: Wei Li <liwei391@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>