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cpu-hotplug: Provide prototypes for arch CPU registration

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Provide common prototypes for arch_register_cpu() and
arch_unregister_cpu(). These are called by acpi_processor.c, with weak
versions, so the prototype for this is already set. It is generally not
necessary for function prototypes to be conditional on preprocessor macros.

Some architectures (e.g. Loongarch) are missing the prototype for this, and
rather than add it to Loongarch's asm/cpu.h, do the job once for everyone.

Since this covers everyone, remove the now unnecessary prototypes in
asm/cpu.h, and therefore remove the 'static' from one of ia64's
arch_register_cpu() definitions.

[ tglx: Bring back the ia64 part and remove the ACPI prototypes ]

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/E1qkoRr-0088Q8-Da@rmk-PC.armlinux.org.uk
This commit is contained in:
Russell King (Oracle) 2023-09-25 17:28:39 +01:00 committed by Thomas Gleixner
parent 94f6f0550c
commit c4dd854f74
7 changed files with 5 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/ia64/include/asm/cpu.h
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@ -15,9 +15,4 @@ DECLARE_PER_CPU(struct ia64_cpu, cpu_devices);
DECLARE_PER_CPU(int, cpu_state);
#ifdef CONFIG_HOTPLUG_CPU
extern int arch_register_cpu(int num);
extern void arch_unregister_cpu(int);
#endif
#endif /* _ASM_IA64_CPU_H_ */

2
arch/ia64/kernel/topology.c
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@ -59,7 +59,7 @@ void __ref arch_unregister_cpu(int num)
}
EXPORT_SYMBOL(arch_unregister_cpu);
#else
static int __init arch_register_cpu(int num)
int __init arch_register_cpu(int num)
{
return register_cpu(&sysfs_cpus[num].cpu, num);
}

2
arch/x86/include/asm/cpu.h
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@ -28,8 +28,6 @@ struct x86_cpu {
};
#ifdef CONFIG_HOTPLUG_CPU
extern int arch_register_cpu(int num);
extern void arch_unregister_cpu(int);
extern void soft_restart_cpu(void);
#endif

2
arch/x86/kernel/topology.c
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@ -54,7 +54,7 @@ void arch_unregister_cpu(int num)
EXPORT_SYMBOL(arch_unregister_cpu);
#else /* CONFIG_HOTPLUG_CPU */
static int __init arch_register_cpu(int num)
int __init arch_register_cpu(int num)
{
return register_cpu(&per_cpu(cpu_devices, num).cpu, num);
}

1
drivers/acpi/acpi_processor.c
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@ -12,6 +12,7 @@
#define pr_fmt(fmt) "ACPI: " fmt
#include <linux/acpi.h>
#include <linux/cpu.h>
#include <linux/device.h>
#include <linux/dmi.h>
#include <linux/kernel.h>

5
include/acpi/processor.h
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@ -465,9 +465,4 @@ extern int acpi_processor_ffh_lpi_probe(unsigned int cpu);
extern int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi);
#endif
#ifdef CONFIG_ACPI_HOTPLUG_CPU
extern int arch_register_cpu(int cpu);
extern void arch_unregister_cpu(int cpu);
#endif
#endif

2
include/linux/cpu.h
View File

@ -80,6 +80,8 @@ extern __printf(4, 5)
struct device *cpu_device_create(struct device *parent, void *drvdata,
const struct attribute_group **groups,
const char *fmt, ...);
extern int arch_register_cpu(int cpu);
extern void arch_unregister_cpu(int cpu);
#ifdef CONFIG_HOTPLUG_CPU
extern void unregister_cpu(struct cpu *cpu);
extern ssize_t arch_cpu_probe(const char *, size_t);