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Subject[PATCH 4.9 039/107] cpu/hotplug: Make bringup/teardown of smp threads symmetric
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Gleixner <tglx@linutronix.de>

commit c4de65696d865c225fda3b9913b31284ea65ea96 upstream

The asymmetry caused a warning to trigger if the bootup was stopped in state
CPUHP_AP_ONLINE_IDLE. The warning no longer triggers as kthread_park() can
now be invoked on already or still parked threads. But there is still no
reason to have this be asymmetric.

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>
---
kernel/cpu.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -817,7 +817,6 @@ static int takedown_cpu(unsigned int cpu

/* Park the smpboot threads */
kthread_park(per_cpu_ptr(&cpuhp_state, cpu)->thread);
- smpboot_park_threads(cpu);

/*
* Prevent irq alloc/free while the dying cpu reorganizes the
@@ -1389,7 +1388,7 @@ static struct cpuhp_step cpuhp_ap_states
[CPUHP_AP_SMPBOOT_THREADS] = {
.name = "smpboot/threads:online",
.startup.single = smpboot_unpark_threads,
- .teardown.single = NULL,
+ .teardown.single = smpboot_park_threads,
},
[CPUHP_AP_PERF_ONLINE] = {
.name = "perf:online",

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