Peter Zijlstra <peterz@xxxxxxxxxxxxx> writes:
> On Tue, Jun 23, 2015 at 04:57:05PM +0000, KY Srinivasan wrote:
>
>> > diff --git a/kernel/cpu.c b/kernel/cpu.c
>> > index 94bbe46..8f35ee6 100644
>> > --- a/kernel/cpu.c
>> > +++ b/kernel/cpu.c
>> > @@ -190,17 +190,19 @@ void cpu_hotplug_done(void)
>> > void cpu_hotplug_disable(void)
>> > {
>> > cpu_maps_update_begin();
>> > - cpu_hotplug_disabled = 1;
>> > + cpu_hotplug_disabled++;
>> > cpu_maps_update_done();
>> > }
>> > +EXPORT_SYMBOL_GPL(cpu_hotplug_disable);
>> >
>> > void cpu_hotplug_enable(void)
>> > {
>> > cpu_maps_update_begin();
>> > - cpu_hotplug_disabled = 0;
>> > + if (cpu_hotplug_disabled)
>> > + cpu_hotplug_disabled--;
>
> No that just papers over bugs.
>
Yes, but these bugs are not in Linux. I don't see any other way for a
platform to enable/disable cpu hotplug in runtime.
--
Vitaly
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