Commit 6414464b authored Dec 27, 2023 by zhangnaichuan

x86/kdump: make crash kernel boot faster

euleros inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8RJ6X?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: zhangnaichuan <zhangnaichuan@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>

parent a60f40a8

arch/x86/kernel/reboot.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -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--;
		}