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tick/nohz: Fix cpu_is_hotpluggable() by checking with nohz subsystem

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[ Upstream commit 58d7668242647e661a20efe065519abd6454287e ]

For CONFIG_NO_HZ_FULL systems, the tick_do_timer_cpu cannot be offlined.
However, cpu_is_hotpluggable() still returns true for those CPUs. This causes
torture tests that do offlining to end up trying to offline this CPU causing
test failures. Such failure happens on all architectures.

Fix the repeated error messages thrown by this (even if the hotplug errors are
harmless) by asking the opinion of the nohz subsystem on whether the CPU can be
hotplugged.

[ Apply Frederic Weisbecker feedback on refactoring tick_nohz_cpu_down(). ]

For drivers/base/ portion:
Acked-by: Greg Kroah-Hartman <[email protected]>
Acked-by: Frederic Weisbecker <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Cc: Zhouyi Zhou <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: rcu <[email protected]>
Cc: [email protected]
Fixes: 2987557f52 ("driver-core/cpu: Expose hotpluggability to the rest of the kernel")
Signed-off-by: Paul E. McKenney <[email protected]>
Signed-off-by: Joel Fernandes (Google) <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Joel Fernandes (Google) 2023-01-24 17:31:26 +00:00 • committed by Greg Kroah-Hartman
commit 352b152905
3 changed files with 12 additions and 4 deletions
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3
drivers/base/cpu.c
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@ -491,7 +491,8 @@ static const struct attribute_group *cpu_root_attr_groups[] = {
bool cpu_is_hotpluggable(unsigned cpu)
{
struct device *dev = get_cpu_device(cpu);
return dev && container_of(dev, struct cpu, dev)->hotpluggable;
return dev && container_of(dev, struct cpu, dev)->hotpluggable
&& tick_nohz_cpu_hotpluggable(cpu);
}
EXPORT_SYMBOL_GPL(cpu_is_hotpluggable);