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Linux/include/linux/context_tracking_state.h

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  1 #ifndef _LINUX_CONTEXT_TRACKING_STATE_H
  2 #define _LINUX_CONTEXT_TRACKING_STATE_H
  3 
  4 #include <linux/percpu.h>
  5 #include <linux/static_key.h>
  6 
  7 struct context_tracking {
  8         /*
  9          * When active is false, probes are unset in order
 10          * to minimize overhead: TIF flags are cleared
 11          * and calls to user_enter/exit are ignored. This
 12          * may be further optimized using static keys.
 13          */
 14         bool active;
 15         int recursion;
 16         enum ctx_state {
 17                 CONTEXT_DISABLED = -1,  /* returned by ct_state() if unknown */
 18                 CONTEXT_KERNEL = 0,
 19                 CONTEXT_USER,
 20                 CONTEXT_GUEST,
 21         } state;
 22 };
 23 
 24 #ifdef CONFIG_CONTEXT_TRACKING
 25 extern struct static_key_false context_tracking_enabled;
 26 DECLARE_PER_CPU(struct context_tracking, context_tracking);
 27 
 28 static inline bool context_tracking_is_enabled(void)
 29 {
 30         return static_branch_unlikely(&context_tracking_enabled);
 31 }
 32 
 33 static inline bool context_tracking_cpu_is_enabled(void)
 34 {
 35         return __this_cpu_read(context_tracking.active);
 36 }
 37 
 38 static inline bool context_tracking_in_user(void)
 39 {
 40         return __this_cpu_read(context_tracking.state) == CONTEXT_USER;
 41 }
 42 #else
 43 static inline bool context_tracking_in_user(void) { return false; }
 44 static inline bool context_tracking_active(void) { return false; }
 45 static inline bool context_tracking_is_enabled(void) { return false; }
 46 static inline bool context_tracking_cpu_is_enabled(void) { return false; }
 47 #endif /* CONFIG_CONTEXT_TRACKING */
 48 
 49 #endif
 50 

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