Commit bb5e44fb authored by Russell King (Oracle)'s avatar Russell King (Oracle) Committed by Greg Kroah-Hartman
Browse files

drivers: base: add arch_cpu_is_hotpluggable() 



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: default avatarShaoqin Huang <shahuang@redhat.com>
Signed-off-by: default avatar"Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
Reviewed-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: default avatarGavin Shan <gshan@redhat.com>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/E1r5R3M-00CszH-6r@rmk-PC.armlinux.org.uk


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 866ec300

drivers/base/cpu.c

+10 −1
Original line number Diff line number Diff line
@@ -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

include/linux/cpu.h

+1 −0
Original line number Diff line number Diff line
@@ -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