diff mbox series

[09/21] drivers: base: add arch_cpu_is_hotpluggable()

Message ID E1r5R3M-00CszH-6r@rmk-PC.armlinux.org.uk (mailing list archive)
State New, archived
Headers show
Series Initial cleanups for vCPU hotplug | expand

Commit Message

Russell King (Oracle) Nov. 21, 2023, 1:44 p.m. UTC 
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>
---
 drivers/base/cpu.c  | 11 ++++++++++-
 include/linux/cpu.h |  1 +
 2 files changed, 11 insertions(+), 1 deletion(-)

Comments

Jonathan Cameron Nov. 30, 2023, 4:51 p.m. UTC | #1 
On Tue, 21 Nov 2023 13:44:36 +0000
"Russell King (Oracle)" <rmk+kernel@armlinux.org.uk> wrote:

> 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>
Gavin Shan Dec. 1, 2023, 3:47 a.m. UTC | #2 
On 11/22/23 00:44, Russell King (Oracle) wrote:
> 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>
> ---
>   drivers/base/cpu.c  | 11 ++++++++++-
>   include/linux/cpu.h |  1 +
>   2 files changed, 11 insertions(+), 1 deletion(-)
> 

Reviewed-by: Gavin Shan <gshan@redhat.com>
diff mbox series

Patch

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 58bb86091b34..221ffbeb1c9b 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -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
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 1e982d63eae8..dcb89c987164 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -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