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drivers: base: add arch_cpu_is_hotpluggable()

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The differences between architecture specific implementations of
arch_register_cpu() are down to whether the CPU is hotpluggable or not.
Rather than overriding the weak version of arch_register_cpu(), provide
a function that can be used to provide this detail instead.

Reviewed-by: Shaoqin Huang <shahuang@redhat.com>
Signed-off-by: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/E1r5R3M-00CszH-6r@rmk-PC.armlinux.org.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Russell King (Oracle) 2023-11-21 13:44:36 +00:00 committed by Greg Kroah-Hartman
parent 866ec30086
commit bb5e44fb3b
2 changed files with 11 additions and 1 deletions
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11
drivers/base/cpu.c
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@ -527,9 +527,18 @@ EXPORT_SYMBOL_GPL(cpu_is_hotpluggable);
#ifdef CONFIG_GENERIC_CPU_DEVICES
DEFINE_PER_CPU(struct cpu, cpu_devices);
bool __weak arch_cpu_is_hotpluggable(int cpu)
{
return false;
}
int __weak arch_register_cpu(int cpu)
{
return register_cpu(&per_cpu(cpu_devices, cpu), cpu);
struct cpu *c = &per_cpu(cpu_devices, cpu);
c->hotpluggable = arch_cpu_is_hotpluggable(cpu);
return register_cpu(c, cpu);
}
#ifdef CONFIG_HOTPLUG_CPU

1
include/linux/cpu.h
View File

@ -80,6 +80,7 @@ extern __printf(4, 5)
struct device *cpu_device_create(struct device *parent, void *drvdata,
const struct attribute_group **groups,
const char *fmt, ...);
extern bool arch_cpu_is_hotpluggable(int cpu);
extern int arch_register_cpu(int cpu);
extern void arch_unregister_cpu(int cpu);
#ifdef CONFIG_HOTPLUG_CPU