euleros inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8RJ6X?from=project-issue CVE: NA

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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: zhangnaichuan zhangnaichuan@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 830425e6d..16a23c140 100644 --- a/arch/x86/kernel/reboot.c +++ b/arch/x86/kernel/reboot.c @@ -925,6 +925,14 @@ 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--; }