Release 4.12 include/linux/context_tracking_state.h

#ifndef _LINUX_CONTEXT_TRACKING_STATE_H

#define _LINUX_CONTEXT_TRACKING_STATE_H

#include <linux/percpu.h>
#include <linux/static_key.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;
	
int recursion;
	
enum ctx_state {
		
CONTEXT_DISABLED = -1,	/* returned by ct_state() if unknown */
		
CONTEXT_KERNEL = 0,
		
CONTEXT_USER,
		
CONTEXT_GUEST,
        } 
state;
};

#ifdef CONFIG_CONTEXT_TRACKING
extern struct static_key_false context_tracking_enabled;
DECLARE_PER_CPU(struct context_tracking, context_tracking);



static inline bool context_tracking_is_enabled(void)
{
	return static_branch_unlikely(&context_tracking_enabled);
}

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

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


static inline bool context_tracking_in_user(void) { return false; }
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static inline bool context_tracking_active(void) { return false; }
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static inline bool context_tracking_is_enabled(void) { return false; }
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static inline bool context_tracking_cpu_is_enabled(void) { return false; }
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#endif /* CONFIG_CONTEXT_TRACKING */

#endif
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Directory: include/linux

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