[RFC PATCH 20/32] drivers: base: Implement weak arch_unregister_cpu()
From: James Morse <james.morse@arm.com>
Date: 2023-02-03 13:56:44
Also in:
kvm, kvmarm, linux-acpi, linux-arch, linux-pm, lkml, loongarch
Subsystem:
driver core, kobjects, debugfs and sysfs, loongarch, the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, Huacai Chen, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Add arch_unregister_cpu() to allow the ACPI machinery to call unregister_cpu(). This is enough for arm64, but needs to be overridden by x86 and ia64 who need to do more work. CC: Jean-Philippe Brucker <redacted> Signed-off-by: James Morse <james.morse@arm.com> --- arch/ia64/include/asm/cpu.h | 4 ---- arch/loongarch/include/asm/cpu.h | 6 ------ arch/x86/include/asm/cpu.h | 1 - drivers/base/cpu.c | 5 +++++ 4 files changed, 5 insertions(+), 11 deletions(-)
diff --git a/arch/ia64/include/asm/cpu.h b/arch/ia64/include/asm/cpu.h
index 6e9786c6ec98..3b36c6a382bb 100644
--- a/arch/ia64/include/asm/cpu.h
+++ b/arch/ia64/include/asm/cpu.h@@ -9,8 +9,4 @@ DECLARE_PER_CPU(int, cpu_state); -#ifdef CONFIG_HOTPLUG_CPU -extern void arch_unregister_cpu(int); -#endif - #endif /* _ASM_IA64_CPU_H_ */
diff --git a/arch/loongarch/include/asm/cpu.h b/arch/loongarch/include/asm/cpu.h
index 1e2c7c61dbea..754f28506791 100644
--- a/arch/loongarch/include/asm/cpu.h
+++ b/arch/loongarch/include/asm/cpu.h@@ -124,10 +124,4 @@ enum cpu_type_enum { #define LOONGARCH_CPU_GUESTID BIT_ULL(CPU_FEATURE_GUESTID) #define LOONGARCH_CPU_HYPERVISOR BIT_ULL(CPU_FEATURE_HYPERVISOR) -#if !defined(__ASSEMBLY__) -#ifdef CONFIG_HOTPLUG_CPU -extern void arch_unregister_cpu(int); -#endif -#endif /* ! __ASSEMBLY__ */ - #endif /* _ASM_CPU_H */
diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h
index 2955541abebb..e5d820be3b72 100644
--- a/arch/x86/include/asm/cpu.h
+++ b/arch/x86/include/asm/cpu.h@@ -24,7 +24,6 @@ static inline void prefill_possible_map(void) {} #endif /* CONFIG_SMP */ #ifdef CONFIG_HOTPLUG_CPU -extern void arch_unregister_cpu(int); extern void start_cpu0(void); #ifdef CONFIG_DEBUG_HOTPLUG_CPU0 extern int _debug_hotplug_cpu(int cpu, int action);
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 0ba646022a5e..bc2ce8c7f383 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c@@ -498,6 +498,11 @@ int __weak arch_register_cpu(int cpu) { return register_cpu(&per_cpu(cpu_devices, cpu), cpu); } + +void __weak arch_unregister_cpu(int num) +{ + unregister_cpu(&per_cpu(cpu_devices, num)); +} #endif static void __init cpu_dev_register_generic(void)
--
2.30.2
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