| Message ID | E1r0JLQ-00CTxK-Ln@rmk-PC.armlinux.org.uk (mailing list archive) |
|---|---|
| State | RFC, archived |
| Headers | show |
| Series | Initial cleanups for vCPU hotplug | expand |
On 11/7/23 18:30, 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. > > Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Reviewed-by: Shaoqin Huang <shahuang@redhat.com> > --- > drivers/base/cpu.c | 11 ++++++++++- > include/linux/cpu.h | 1 + > 2 files changed, 11 insertions(+), 1 deletion(-) > > 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
On 11/7/23 20:30, 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. > > 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>
On Tue, 07 Nov 2023 10:30:04 +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. > > Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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
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. 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(-)