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ANDROID: idle_notifier: Add generic idle notifiers

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AOSP Change-ID: Idf29cda15be151f494ff245933c12462643388d5
moved x86_64 idle notifiers as generic so that they can
be used in interactive governor.

Upstream change 8e7a7ee9dd ("x86/idle: Remove idle_notifier")
removed x86_64 idle notifiers altogether. This patch add
generic idle notifiers again.

Fixes: android-4.9 commit bfd2a547fc17 ("ANDROID: ARM: Call idle notifiers")
Change-Id: I94a66c74616a4108f4ed49f9afb2447079599f90
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Liang Chen <cl@rock-chips.com>
(cherry picked from https://android.googlesource.com/kernel/msm
 commit c2461bc0a4001a35cc3876c62ff27220467efe66)
This commit is contained in:
Amit Pundir
2017-02-23 16:02:45 -08:00
committed by Liang Chen
parent fecf3d2a6c
commit f9144816b5
2 changed files with 27 additions and 0 deletions
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7
include/linux/cpu.h
View File

@@ -232,4 +232,11 @@ static inline int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval) { return 0;
extern bool cpu_mitigations_off(void);
extern bool cpu_mitigations_auto_nosmt(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

@@ -2913,3 +2913,23 @@ bool cpu_mitigations_auto_nosmt(void)
return cpu_mitigations == CPU_MITIGATIONS_AUTO_NOSMT;
}
EXPORT_SYMBOL_GPL(cpu_mitigations_auto_nosmt);
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);