From: Bin Wang <wangbin224@huawei.com> euleros inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I4SJBG?from=project-issue CVE: NA --------------------------- 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. Signed-off-by: Bin Wang <wangbin224@huawei.com> Reviewed-by: luo chunsheng <luochunsheng@huawei.com> Reviewed-by: Yang Jihong <yangjihong1@huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> --- arch/x86/kernel/reboot.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c index 798a6f73f894..e50da62a67a2 100644 --- a/arch/x86/kernel/reboot.c +++ b/arch/x86/kernel/reboot.c @@ -871,6 +871,14 @@ void nmi_shootdown_cpus(nmi_shootdown_cb callback) msecs = 1000; /* Wait at most a second for the other cpus to stop */ while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) { + /* + * 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. + */ + if (num_online_cpus() == 1) + break; mdelay(1); msecs--; } -- 2.20.1