[PATCH RFC 09/22] drivers: base: add arch_cpu_is_hotpluggable()
From: Russell King (Oracle) <hidden>
Date: 2023-11-07 10:30:29
Also in:
kvmarm, linux-acpi, linux-arch, linux-arm-kernel, linux-pm, linux-riscv, lkml, loongarch
Subsystem:
cpu hotplug, driver core, kobjects, debugfs and sysfs, the rest · Maintainers:
Thomas Gleixner, Peter Zijlstra, Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, Linus Torvalds
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) <redacted> --- 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
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2.30.2