| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 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 | /* |
| 8 | * Traverse the ftrace_global_list, invoking all entries. The reason that we |
| 9 | * can use rcu_dereference_raw_check() is that elements removed from this list |
| 10 | * are simply leaked, so there is no need to interact with a grace-period |
| 11 | * mechanism. The rcu_dereference_raw_check() calls are needed to handle |
| 12 | * concurrent insertions into the ftrace_global_list. |
| 13 | * |
| 14 | * Silly Alpha and silly pointer-speculation compiler optimizations! |
| 15 | */ |
| 16 | #define do_for_each_ftrace_op(op, list) \ |
| 17 | op = rcu_dereference_raw_check(list); \ |
| 18 | do |
| 19 | |
| 20 | /* |
| 21 | * Optimized for just a single item in the list (as that is the normal case). |
| 22 | */ |
| 23 | #define while_for_each_ftrace_op(op) \ |
| 24 | while (likely(op = rcu_dereference_raw_check((op)->next)) && \ |
| 25 | unlikely((op) != &ftrace_list_end)) |
| 26 | |
| 27 | extern struct ftrace_ops __rcu *ftrace_ops_list; |
| 28 | extern struct ftrace_ops ftrace_list_end; |
| 29 | extern struct mutex ftrace_lock; |
| 30 | extern struct ftrace_ops global_ops; |
| 31 | |
| 32 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 33 | |
| 34 | int ftrace_startup(struct ftrace_ops *ops, int command); |
| 35 | int ftrace_shutdown(struct ftrace_ops *ops, int command); |
| 36 | int ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs); |
| 37 | |
| 38 | #else /* !CONFIG_DYNAMIC_FTRACE */ |
| 39 | |
| 40 | int __register_ftrace_function(struct ftrace_ops *ops); |
| 41 | int __unregister_ftrace_function(struct ftrace_ops *ops); |
| 42 | /* Keep as macros so we do not need to define the commands */ |
| 43 | # define ftrace_startup(ops, command) \ |
| 44 | ({ \ |
| 45 | int ___ret = __register_ftrace_function(ops); \ |
| 46 | if (!___ret) \ |
| 47 | (ops)->flags |= FTRACE_OPS_FL_ENABLED; \ |
| 48 | ___ret; \ |
| 49 | }) |
| 50 | # define ftrace_shutdown(ops, command) \ |
| 51 | ({ \ |
| 52 | int ___ret = __unregister_ftrace_function(ops); \ |
| 53 | if (!___ret) \ |
| 54 | (ops)->flags &= ~FTRACE_OPS_FL_ENABLED; \ |
| 55 | ___ret; \ |
| 56 | }) |
| 57 | static inline int |
| 58 | ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs) |
| 59 | { |
| 60 | return 1; |
| 61 | } |
| 62 | #endif /* CONFIG_DYNAMIC_FTRACE */ |
| 63 | |
| 64 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 65 | extern int ftrace_graph_active; |
| 66 | void update_function_graph_func(void); |
| 67 | #else /* !CONFIG_FUNCTION_GRAPH_TRACER */ |
| 68 | # define ftrace_graph_active 0 |
| 69 | static inline void update_function_graph_func(void) { } |
| 70 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
| 71 | |
| 72 | #else /* !CONFIG_FUNCTION_TRACER */ |
| 73 | #endif /* CONFIG_FUNCTION_TRACER */ |
| 74 | |
| 75 | #endif |