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