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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>
This commit is contained in:
Vitaly Kuznetsov 2015-08-05 00:52:47 -07:00 committed by Greg Kroah-Hartman
parent 89af7ba574
commit 32145c4677
1 changed files with 2 additions and 1 deletions
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3
kernel/cpu.c
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@ -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? */