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Move x86_64 idle notifiers to generic

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Move the x86_64 idle notifiers originally by Andi Kleen and Venkatesh
Pallipadi to generic.

Change-Id: Idf29cda15be151f494ff245933c12462643388d5
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Todd Poynor <toddpoynor@google.com>
This commit is contained in:
Todd Poynor
2011-06-15 17:21:57 -07:00
committed by Arve Hjønnevåg
parent d343106d12
commit 302467bb15
4 changed files with 29 additions and 22 deletions
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7
arch/x86/include/asm/idle.h
View File

@@ -1,13 +1,6 @@
#ifndef _ASM_X86_IDLE_H
#define _ASM_X86_IDLE_H
#define IDLE_START 1
#define IDLE_END 2
struct notifier_block;
void idle_notifier_register(struct notifier_block *n);
void idle_notifier_unregister(struct notifier_block *n);
#ifdef CONFIG_X86_64
void enter_idle(void);
void exit_idle(void);

17
arch/x86/kernel/process.c
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@@ -40,19 +40,6 @@ DEFINE_PER_CPU_SHARED_ALIGNED(struct tss_struct, init_tss) = INIT_TSS;
#ifdef CONFIG_X86_64
static DEFINE_PER_CPU(unsigned char, is_idle);
static ATOMIC_NOTIFIER_HEAD(idle_notifier);
void idle_notifier_register(struct notifier_block *n)
{
atomic_notifier_chain_register(&idle_notifier, n);
}
EXPORT_SYMBOL_GPL(idle_notifier_register);
void idle_notifier_unregister(struct notifier_block *n)
{
atomic_notifier_chain_unregister(&idle_notifier, n);
}
EXPORT_SYMBOL_GPL(idle_notifier_unregister);
#endif
struct kmem_cache *task_xstate_cachep;
@@ -257,14 +244,14 @@ static inline void play_dead(void)
void enter_idle(void)
{
this_cpu_write(is_idle, 1);
atomic_notifier_call_chain(&idle_notifier, IDLE_START, NULL);
idle_notifier_call_chain(IDLE_START);
}
static void __exit_idle(void)
{
if (x86_test_and_clear_bit_percpu(0, is_idle) == 0)
return;
atomic_notifier_call_chain(&idle_notifier, IDLE_END, NULL);
idle_notifier_call_chain(IDLE_END);
}
/* Called from interrupts to signify idle end */

7
include/linux/cpu.h
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@@ -232,4 +232,11 @@ void arch_cpu_idle_enter(void);
void arch_cpu_idle_exit(void);
void arch_cpu_idle_dead(void);
#define IDLE_START 1
#define IDLE_END 2
void idle_notifier_register(struct notifier_block *n);
void idle_notifier_unregister(struct notifier_block *n);
void idle_notifier_call_chain(unsigned long val);
#endif /* _LINUX_CPU_H_ */

20
kernel/cpu.c
View File

@@ -726,3 +726,23 @@ void init_cpu_online(const struct cpumask *src)
{
cpumask_copy(to_cpumask(cpu_online_bits), src);
}
static ATOMIC_NOTIFIER_HEAD(idle_notifier);
void idle_notifier_register(struct notifier_block *n)
{
atomic_notifier_chain_register(&idle_notifier, n);
}
EXPORT_SYMBOL_GPL(idle_notifier_register);
void idle_notifier_unregister(struct notifier_block *n)
{
atomic_notifier_chain_unregister(&idle_notifier, n);
}
EXPORT_SYMBOL_GPL(idle_notifier_unregister);
void idle_notifier_call_chain(unsigned long val)
{
atomic_notifier_call_chain(&idle_notifier, val, NULL);
}
EXPORT_SYMBOL_GPL(idle_notifier_call_chain);