kernel/trace/ftrace_internal.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_KERNEL_FTRACE_INTERNAL_H
   3 #define  _LINUX_KERNEL_FTRACE_INTERNAL_H
   4
   5 int __register_ftrace_function(struct ftrace_ops *ops);
   6 int __unregister_ftrace_function(struct ftrace_ops *ops);
   7
   8 #ifdef CONFIG_FUNCTION_TRACER
   9
  10 extern struct mutex ftrace_lock;
  11 extern struct ftrace_ops global_ops;
  12
  13 #ifdef CONFIG_DYNAMIC_FTRACE
  14
  15 int ftrace_startup(struct ftrace_ops *ops, int command);
  16 int ftrace_shutdown(struct ftrace_ops *ops, int command);
  17 int ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs);
  18
  19 #else /* !CONFIG_DYNAMIC_FTRACE */
  20
  21 /* Keep as macros so we do not need to define the commands */
  22 # define ftrace_startup(ops, command)                                   \
  23         ({                                                              \
  24                 int ___ret = __register_ftrace_function(ops);           \
  25                 if (!___ret)                                            \
  26                         (ops)->flags |= FTRACE_OPS_FL_ENABLED;          \
  27                 ___ret;                                                 \
  28         })
  29 # define ftrace_shutdown(ops, command)                                  \
  30         ({                                                              \
  31                 int ___ret = __unregister_ftrace_function(ops);         \
  32                 if (!___ret)                                            \
  33                         (ops)->flags &= ~FTRACE_OPS_FL_ENABLED;         \
  34                 ___ret;                                                 \
  35         })
  36 static inline int
  37 ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs)
  38 {
  39         return 1;
  40 }
  41 #endif /* CONFIG_DYNAMIC_FTRACE */
  42
  43 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
  44 extern int ftrace_graph_active;
  45 void update_function_graph_func(void);
  46 #else /* !CONFIG_FUNCTION_GRAPH_TRACER */
  47 # define ftrace_graph_active 0
  48 static inline void update_function_graph_func(void) { }
  49 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
  50
  51 #else /* !CONFIG_FUNCTION_TRACER */
  52 #endif /* CONFIG_FUNCTION_TRACER */
  53
  54 #endif