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cpu/hotplug: Split do_cpu_down()

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commit cc1fe215e1efa406b03aa4389e6269b61342dec5 upstream

Split out the inner workings of do_cpu_down() to allow reuse of that
function for the upcoming SMT disabling mechanism.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Gleixner 2018-05-29 17:49:05 +02:00 committed by Greg Kroah-Hartman
parent 9333575fc4
commit 373b8def45
1 changed files with 8 additions and 9 deletions
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17
kernel/cpu.c
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@ -955,20 +955,19 @@ out:
return ret;
}
static int cpu_down_maps_locked(unsigned int cpu, enum cpuhp_state target)
{
if (cpu_hotplug_disabled)
return -EBUSY;
return _cpu_down(cpu, 0, target);
}
static int do_cpu_down(unsigned int cpu, enum cpuhp_state target)
{
int err;
cpu_maps_update_begin();
if (cpu_hotplug_disabled) {
err = -EBUSY;
goto out;
}
err = _cpu_down(cpu, 0, target);
out:
err = cpu_down_maps_locked(cpu, target);
cpu_maps_update_done();
return err;
}