[PATCH 1/3] Subject: nohz: Expose tick_nohz_enabled

Jean Delvare
2016-01-11T16:40:37Z

The cpuidle subsystem needs it.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Zhang Rui <rui.zhang@intel.com>
---
include/linux/tick.h | 2 ++
kernel/time/tick-sched.c | 2 +-
2 files changed, 3 insertions(+), 1 deletion(-)

--- linux-4.4.orig/include/linux/tick.h 2016-01-11 00:01:32.000000000 +0100
+++ linux-4.4/include/linux/tick.h 2016-01-11 15:10:46.334547548 +0100
@@ -98,6 +98,7 @@ static inline void tick_broadcast_exit(v
}

#ifdef CONFIG_NO_HZ_COMMON
+extern int tick_nohz_enabled;
extern int tick_nohz_tick_stopped(void);
extern void tick_nohz_idle_enter(void);
extern void tick_nohz_idle_exit(void);
@@ -106,6 +107,7 @@ extern ktime_t tick_nohz_get_sleep_lengt
extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);
#else /* !CONFIG_NO_HZ_COMMON */
+#define tick_nohz_enabled (0)
static inline int tick_nohz_tick_stopped(void) { return 0; }
static inline void tick_nohz_idle_enter(void) { }
static inline void tick_nohz_idle_exit(void) { }
--- linux-4.4.orig/kernel/time/tick-sched.c 2016-01-11 15:06:54.776653477 +0100
+++ linux-4.4/kernel/time/tick-sched.c 2016-01-11 15:09:19.022700899 +0100
@@ -387,7 +387,7 @@ void __init tick_nohz_init(void)
/*
* NO HZ enabled ?
*/
-static int tick_nohz_enabled __read_mostly = 1;
+int tick_nohz_enabled __read_mostly = 1;
unsigned long tick_nohz_active __read_mostly;
/*
* Enable / Disable tickless mode