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cpu: Register a generic CPU device on architectures that currently do not

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frv, h8300, m68k, microblaze, openrisc, score, um and xtensa currently
do not register a CPU device.  Add the config option GENERIC_CPU_DEVICES
which causes a generic CPU device to be registered for each present CPU,
and make all these architectures select it.

Richard Weinberger <[email protected]> covered UML and suggested using
per_cpu.

Signed-off-by: Ben Hutchings <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ben Hutchings 2012-01-10 03:04:32 +00:00 • committed by Linus Torvalds
commit 9f13a1fd45
10 changed files with 31 additions and 0 deletions
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4
drivers/base/Kconfig
View file

@ -172,6 +172,10 @@ config SYS_HYPERVISOR
bool
default n
config GENERIC_CPU_DEVICES
bool
default n
source "drivers/base/regmap/Kconfig"
config DMA_SHARED_BUFFER

19
drivers/base/cpu.c
View file

@ -11,6 +11,7 @@
#include <linux/device.h>
#include <linux/node.h>
#include <linux/gfp.h>
#include <linux/percpu.h>
#include "base.h"
@ -275,11 +276,29 @@ bool cpu_is_hotpluggable(unsigned cpu)
}
EXPORT_SYMBOL_GPL(cpu_is_hotpluggable);
#ifdef CONFIG_GENERIC_CPU_DEVICES
static DEFINE_PER_CPU(struct cpu, cpu_devices);
#endif
static void __init cpu_dev_register_generic(void)
{
#ifdef CONFIG_GENERIC_CPU_DEVICES
int i;
for_each_possible_cpu(i) {
if (register_cpu(&per_cpu(cpu_devices, i), i))
panic("Failed to register CPU device");
}
#endif
}
void __init cpu_dev_init(void)
{
if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups))
panic("Failed to register CPU subsystem");
cpu_dev_register_generic();
#if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
sched_create_sysfs_power_savings_entries(cpu_subsys.dev_root);
#endif