Commit 32145c46 authored Aug 05, 2015 by Vitaly Kuznetsov Committed by Greg Kroah-Hartman Aug 05, 2015

cpu-hotplug: export cpu_hotplug_enable/cpu_hotplug_disable



Hyper-V module needs to disable cpu hotplug (offlining) as there is no
support from hypervisor side to reassign already opened event channels
to a different CPU. Currently it is been done by altering
smp_ops.cpu_disable but it is hackish.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 89af7ba5

kernel/cpu.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -194,6 +194,7 @@ void cpu_hotplug_disable(void)
		cpu_hotplug_disabled++;
		cpu_maps_update_done();
		}
		EXPORT_SYMBOL_GPL(cpu_hotplug_disable);

		void cpu_hotplug_enable(void)
		{
		@@ -201,7 +202,7 @@ void cpu_hotplug_enable(void)
		WARN_ON(--cpu_hotplug_disabled < 0);
		cpu_maps_update_done();
		}

		EXPORT_SYMBOL_GPL(cpu_hotplug_enable);
		#endif /* CONFIG_HOTPLUG_CPU */

		/* Need to know about CPUs going up/down? */

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