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| author | Joel Fernandes (Google) <joel@joelfernandes.org> | 2023-01-24 20:31:26 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-05-11 17:03:01 +0300 |
| commit | 3e7b8a723b0cd575f8eea0254210ee48d86db153 (patch) | |
| tree | ce82d54e0cdc5ebd190dd39a4b82593970654108 /drivers/base | |
| parent | c94e5baa989f687fd9f0acf95a15ab4aebbaf3b4 (diff) | |
| download | linux-3e7b8a723b0cd575f8eea0254210ee48d86db153.tar.xz | |
tick/nohz: Fix cpu_is_hotpluggable() by checking with nohz subsystem
commit 58d7668242647e661a20efe065519abd6454287e upstream.
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 <gregkh@linuxfoundation.org>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Frederic Weisbecker <frederic@kernel.org>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Zhouyi Zhou <zhouzhouyi@gmail.com>
Cc: Will Deacon <will@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: rcu <rcu@vger.kernel.org>
Cc: stable@vger.kernel.org
Fixes: 2987557f52b9 ("driver-core/cpu: Expose hotpluggability to the rest of the kernel")
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/cpu.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c index 4c98849577d4..7af8e33735a3 100644 --- a/drivers/base/cpu.c +++ b/drivers/base/cpu.c @@ -487,7 +487,8 @@ static const struct attribute_group *cpu_root_attr_groups[] = { bool cpu_is_hotpluggable(unsigned int 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); |