[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / context_tracking.h

#ifndef _LINUX_CONTEXT_TRACKING_H
#define _LINUX_CONTEXT_TRACKING_H

#ifdef CONFIG_CONTEXT_TRACKING
#include <linux/sched.h>
#include <linux/percpu.h>

struct context_tracking {
	/*
	 * When active is false, probes are unset in order
	 * to minimize overhead: TIF flags are cleared
	 * and calls to user_enter/exit are ignored. This
	 * may be further optimized using static keys.
	 */
	bool active;
	enum {
		IN_KERNEL = 0,
		IN_USER,
	} state;
};

DECLARE_PER_CPU(struct context_tracking, context_tracking);

static inline bool context_tracking_in_user(void)
{
	return __this_cpu_read(context_tracking.state) == IN_USER;
}

static inline bool context_tracking_active(void)
{
	return __this_cpu_read(context_tracking.active);
}

extern void user_enter(void);
extern void user_exit(void);
extern void context_tracking_task_switch(struct task_struct *prev,
					 struct task_struct *next);
#else
static inline bool context_tracking_in_user(void) { return false; }
static inline void user_enter(void) { }
static inline void user_exit(void) { }
static inline void context_tracking_task_switch(struct task_struct *prev,
						struct task_struct *next) { }
#endif /* !CONFIG_CONTEXT_TRACKING */

#endif
Commit	Line	Data
91d1aa43 FW	1	#ifndef _LINUX_CONTEXT_TRACKING_H
	2	#define _LINUX_CONTEXT_TRACKING_H
	3
	4	#ifdef CONFIG_CONTEXT_TRACKING
	5	#include <linux/sched.h>
95a79fd4 FW	6	#include <linux/percpu.h>
	7
	8	struct context_tracking {
	9	/*
	10	* When active is false, probes are unset in order
	11	* to minimize overhead: TIF flags are cleared
	12	* and calls to user_enter/exit are ignored. This
	13	* may be further optimized using static keys.
	14	*/
	15	bool active;
	16	enum {
	17	IN_KERNEL = 0,
	18	IN_USER,
	19	} state;
	20	};
	21
	22	DECLARE_PER_CPU(struct context_tracking, context_tracking);
	23
	24	static inline bool context_tracking_in_user(void)
	25	{
	26	return __this_cpu_read(context_tracking.state) == IN_USER;
	27	}
	28
	29	static inline bool context_tracking_active(void)
	30	{
	31	return __this_cpu_read(context_tracking.active);
	32	}
91d1aa43 FW	33
	34	extern void user_enter(void);
	35	extern void user_exit(void);
	36	extern void context_tracking_task_switch(struct task_struct *prev,
	37	struct task_struct *next);
	38	#else
95a79fd4	39	static inline bool context_tracking_in_user(void) { return false; }
91d1aa43 FW	40	static inline void user_enter(void) { }
	41	static inline void user_exit(void) { }
	42	static inline void context_tracking_task_switch(struct task_struct *prev,
	43	struct task_struct *next) { }
	44	#endif /* !CONFIG_CONTEXT_TRACKING */
	45
	46	#endif