1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Ftrace header. For implementation details beyond the random comments 4 * scattered below, see: Documentation/trace/ftrace-design.rst 5 */ 6 7 #ifndef _LINUX_FTRACE_H 8 #define _LINUX_FTRACE_H 9 10 #include <linux/trace_recursion.h> 11 #include <linux/trace_clock.h> 12 #include <linux/jump_label.h> 13 #include <linux/kallsyms.h> 14 #include <linux/linkage.h> 15 #include <linux/bitops.h> 16 #include <linux/ptrace.h> 17 #include <linux/ktime.h> 18 #include <linux/sched.h> 19 #include <linux/types.h> 20 #include <linux/init.h> 21 #include <linux/fs.h> 22 23 #include <asm/ftrace.h> 24 25 /* 26 * If the arch supports passing the variable contents of 27 * function_trace_op as the third parameter back from the 28 * mcount call, then the arch should define this as 1. 29 */ 30 #ifndef ARCH_SUPPORTS_FTRACE_OPS 31 #define ARCH_SUPPORTS_FTRACE_OPS 0 32 #endif 33 34 #ifdef CONFIG_TRACING 35 extern void ftrace_boot_snapshot(void); 36 #else 37 static inline void ftrace_boot_snapshot(void) { } 38 #endif 39 40 struct ftrace_ops; 41 struct ftrace_regs; 42 struct dyn_ftrace; 43 44 char *arch_ftrace_match_adjust(char *str, const char *search); 45 46 #ifdef CONFIG_HAVE_FUNCTION_GRAPH_RETVAL 47 struct fgraph_ret_regs; 48 unsigned long ftrace_return_to_handler(struct fgraph_ret_regs *ret_regs); 49 #else 50 unsigned long ftrace_return_to_handler(unsigned long frame_pointer); 51 #endif 52 53 #ifdef CONFIG_FUNCTION_TRACER 54 /* 55 * If the arch's mcount caller does not support all of ftrace's 56 * features, then it must call an indirect function that 57 * does. Or at least does enough to prevent any unwelcome side effects. 58 * 59 * Also define the function prototype that these architectures use 60 * to call the ftrace_ops_list_func(). 61 */ 62 #if !ARCH_SUPPORTS_FTRACE_OPS 63 # define FTRACE_FORCE_LIST_FUNC 1 64 void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip); 65 #else 66 # define FTRACE_FORCE_LIST_FUNC 0 67 void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip, 68 struct ftrace_ops *op, struct ftrace_regs *fregs); 69 #endif 70 extern const struct ftrace_ops ftrace_nop_ops; 71 extern const struct ftrace_ops ftrace_list_ops; 72 struct ftrace_ops *ftrace_find_unique_ops(struct dyn_ftrace *rec); 73 #endif /* CONFIG_FUNCTION_TRACER */ 74 75 /* Main tracing buffer and events set up */ 76 #ifdef CONFIG_TRACING 77 void trace_init(void); 78 void early_trace_init(void); 79 #else 80 static inline void trace_init(void) { } 81 static inline void early_trace_init(void) { } 82 #endif 83 84 struct module; 85 struct ftrace_hash; 86 87 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_MODULES) && \ 88 defined(CONFIG_DYNAMIC_FTRACE) 89 const char * 90 ftrace_mod_address_lookup(unsigned long addr, unsigned long *size, 91 unsigned long *off, char **modname, char *sym); 92 #else 93 static inline const char * 94 ftrace_mod_address_lookup(unsigned long addr, unsigned long *size, 95 unsigned long *off, char **modname, char *sym) 96 { 97 return NULL; 98 } 99 #endif 100 101 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 102 int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value, 103 char *type, char *name, 104 char *module_name, int *exported); 105 #else 106 static inline int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value, 107 char *type, char *name, 108 char *module_name, int *exported) 109 { 110 return -1; 111 } 112 #endif 113 114 #ifdef CONFIG_FUNCTION_TRACER 115 116 extern int ftrace_enabled; 117 118 #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS 119 120 struct ftrace_regs { 121 struct pt_regs regs; 122 }; 123 #define arch_ftrace_get_regs(fregs) (&(fregs)->regs) 124 125 /* 126 * ftrace_regs_set_instruction_pointer() is to be defined by the architecture 127 * if to allow setting of the instruction pointer from the ftrace_regs when 128 * HAVE_DYNAMIC_FTRACE_WITH_ARGS is set and it supports live kernel patching. 129 */ 130 #define ftrace_regs_set_instruction_pointer(fregs, ip) do { } while (0) 131 #endif /* CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */ 132 133 static __always_inline struct pt_regs *ftrace_get_regs(struct ftrace_regs *fregs) 134 { 135 if (!fregs) 136 return NULL; 137 138 return arch_ftrace_get_regs(fregs); 139 } 140 141 /* 142 * When true, the ftrace_regs_{get,set}_*() functions may be used on fregs. 143 * Note: this can be true even when ftrace_get_regs() cannot provide a pt_regs. 144 */ 145 static __always_inline bool ftrace_regs_has_args(struct ftrace_regs *fregs) 146 { 147 if (IS_ENABLED(CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS)) 148 return true; 149 150 return ftrace_get_regs(fregs) != NULL; 151 } 152 153 #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS 154 #define ftrace_regs_get_instruction_pointer(fregs) \ 155 instruction_pointer(ftrace_get_regs(fregs)) 156 #define ftrace_regs_get_argument(fregs, n) \ 157 regs_get_kernel_argument(ftrace_get_regs(fregs), n) 158 #define ftrace_regs_get_stack_pointer(fregs) \ 159 kernel_stack_pointer(ftrace_get_regs(fregs)) 160 #define ftrace_regs_return_value(fregs) \ 161 regs_return_value(ftrace_get_regs(fregs)) 162 #define ftrace_regs_set_return_value(fregs, ret) \ 163 regs_set_return_value(ftrace_get_regs(fregs), ret) 164 #define ftrace_override_function_with_return(fregs) \ 165 override_function_with_return(ftrace_get_regs(fregs)) 166 #define ftrace_regs_query_register_offset(name) \ 167 regs_query_register_offset(name) 168 #endif 169 170 typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip, 171 struct ftrace_ops *op, struct ftrace_regs *fregs); 172 173 ftrace_func_t ftrace_ops_get_func(struct ftrace_ops *ops); 174 175 /* 176 * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are 177 * set in the flags member. 178 * CONTROL, SAVE_REGS, SAVE_REGS_IF_SUPPORTED, RECURSION, STUB and 179 * IPMODIFY are a kind of attribute flags which can be set only before 180 * registering the ftrace_ops, and can not be modified while registered. 181 * Changing those attribute flags after registering ftrace_ops will 182 * cause unexpected results. 183 * 184 * ENABLED - set/unset when ftrace_ops is registered/unregistered 185 * DYNAMIC - set when ftrace_ops is registered to denote dynamically 186 * allocated ftrace_ops which need special care 187 * SAVE_REGS - The ftrace_ops wants regs saved at each function called 188 * and passed to the callback. If this flag is set, but the 189 * architecture does not support passing regs 190 * (CONFIG_DYNAMIC_FTRACE_WITH_REGS is not defined), then the 191 * ftrace_ops will fail to register, unless the next flag 192 * is set. 193 * SAVE_REGS_IF_SUPPORTED - This is the same as SAVE_REGS, but if the 194 * handler can handle an arch that does not save regs 195 * (the handler tests if regs == NULL), then it can set 196 * this flag instead. It will not fail registering the ftrace_ops 197 * but, the regs field will be NULL if the arch does not support 198 * passing regs to the handler. 199 * Note, if this flag is set, the SAVE_REGS flag will automatically 200 * get set upon registering the ftrace_ops, if the arch supports it. 201 * RECURSION - The ftrace_ops can set this to tell the ftrace infrastructure 202 * that the call back needs recursion protection. If it does 203 * not set this, then the ftrace infrastructure will assume 204 * that the callback can handle recursion on its own. 205 * STUB - The ftrace_ops is just a place holder. 206 * INITIALIZED - The ftrace_ops has already been initialized (first use time 207 * register_ftrace_function() is called, it will initialized the ops) 208 * DELETED - The ops are being deleted, do not let them be registered again. 209 * ADDING - The ops is in the process of being added. 210 * REMOVING - The ops is in the process of being removed. 211 * MODIFYING - The ops is in the process of changing its filter functions. 212 * ALLOC_TRAMP - A dynamic trampoline was allocated by the core code. 213 * The arch specific code sets this flag when it allocated a 214 * trampoline. This lets the arch know that it can update the 215 * trampoline in case the callback function changes. 216 * The ftrace_ops trampoline can be set by the ftrace users, and 217 * in such cases the arch must not modify it. Only the arch ftrace 218 * core code should set this flag. 219 * IPMODIFY - The ops can modify the IP register. This can only be set with 220 * SAVE_REGS. If another ops with this flag set is already registered 221 * for any of the functions that this ops will be registered for, then 222 * this ops will fail to register or set_filter_ip. 223 * PID - Is affected by set_ftrace_pid (allows filtering on those pids) 224 * RCU - Set when the ops can only be called when RCU is watching. 225 * TRACE_ARRAY - The ops->private points to a trace_array descriptor. 226 * PERMANENT - Set when the ops is permanent and should not be affected by 227 * ftrace_enabled. 228 * DIRECT - Used by the direct ftrace_ops helper for direct functions 229 * (internal ftrace only, should not be used by others) 230 */ 231 enum { 232 FTRACE_OPS_FL_ENABLED = BIT(0), 233 FTRACE_OPS_FL_DYNAMIC = BIT(1), 234 FTRACE_OPS_FL_SAVE_REGS = BIT(2), 235 FTRACE_OPS_FL_SAVE_REGS_IF_SUPPORTED = BIT(3), 236 FTRACE_OPS_FL_RECURSION = BIT(4), 237 FTRACE_OPS_FL_STUB = BIT(5), 238 FTRACE_OPS_FL_INITIALIZED = BIT(6), 239 FTRACE_OPS_FL_DELETED = BIT(7), 240 FTRACE_OPS_FL_ADDING = BIT(8), 241 FTRACE_OPS_FL_REMOVING = BIT(9), 242 FTRACE_OPS_FL_MODIFYING = BIT(10), 243 FTRACE_OPS_FL_ALLOC_TRAMP = BIT(11), 244 FTRACE_OPS_FL_IPMODIFY = BIT(12), 245 FTRACE_OPS_FL_PID = BIT(13), 246 FTRACE_OPS_FL_RCU = BIT(14), 247 FTRACE_OPS_FL_TRACE_ARRAY = BIT(15), 248 FTRACE_OPS_FL_PERMANENT = BIT(16), 249 FTRACE_OPS_FL_DIRECT = BIT(17), 250 }; 251 252 #ifndef CONFIG_DYNAMIC_FTRACE_WITH_ARGS 253 #define FTRACE_OPS_FL_SAVE_ARGS FTRACE_OPS_FL_SAVE_REGS 254 #else 255 #define FTRACE_OPS_FL_SAVE_ARGS 0 256 #endif 257 258 /* 259 * FTRACE_OPS_CMD_* commands allow the ftrace core logic to request changes 260 * to a ftrace_ops. Note, the requests may fail. 261 * 262 * ENABLE_SHARE_IPMODIFY_SELF - enable a DIRECT ops to work on the same 263 * function as an ops with IPMODIFY. Called 264 * when the DIRECT ops is being registered. 265 * This is called with both direct_mutex and 266 * ftrace_lock are locked. 267 * 268 * ENABLE_SHARE_IPMODIFY_PEER - enable a DIRECT ops to work on the same 269 * function as an ops with IPMODIFY. Called 270 * when the other ops (the one with IPMODIFY) 271 * is being registered. 272 * This is called with direct_mutex locked. 273 * 274 * DISABLE_SHARE_IPMODIFY_PEER - disable a DIRECT ops to work on the same 275 * function as an ops with IPMODIFY. Called 276 * when the other ops (the one with IPMODIFY) 277 * is being unregistered. 278 * This is called with direct_mutex locked. 279 */ 280 enum ftrace_ops_cmd { 281 FTRACE_OPS_CMD_ENABLE_SHARE_IPMODIFY_SELF, 282 FTRACE_OPS_CMD_ENABLE_SHARE_IPMODIFY_PEER, 283 FTRACE_OPS_CMD_DISABLE_SHARE_IPMODIFY_PEER, 284 }; 285 286 /* 287 * For most ftrace_ops_cmd, 288 * Returns: 289 * 0 - Success. 290 * Negative on failure. The return value is dependent on the 291 * callback. 292 */ 293 typedef int (*ftrace_ops_func_t)(struct ftrace_ops *op, enum ftrace_ops_cmd cmd); 294 295 #ifdef CONFIG_DYNAMIC_FTRACE 296 /* The hash used to know what functions callbacks trace */ 297 struct ftrace_ops_hash { 298 struct ftrace_hash __rcu *notrace_hash; 299 struct ftrace_hash __rcu *filter_hash; 300 struct mutex regex_lock; 301 }; 302 303 void ftrace_free_init_mem(void); 304 void ftrace_free_mem(struct module *mod, void *start, void *end); 305 #else 306 static inline void ftrace_free_init_mem(void) 307 { 308 ftrace_boot_snapshot(); 309 } 310 static inline void ftrace_free_mem(struct module *mod, void *start, void *end) { } 311 #endif 312 313 /* 314 * Note, ftrace_ops can be referenced outside of RCU protection, unless 315 * the RCU flag is set. If ftrace_ops is allocated and not part of kernel 316 * core data, the unregistering of it will perform a scheduling on all CPUs 317 * to make sure that there are no more users. Depending on the load of the 318 * system that may take a bit of time. 319 * 320 * Any private data added must also take care not to be freed and if private 321 * data is added to a ftrace_ops that is in core code, the user of the 322 * ftrace_ops must perform a schedule_on_each_cpu() before freeing it. 323 */ 324 struct ftrace_ops { 325 ftrace_func_t func; 326 struct ftrace_ops __rcu *next; 327 unsigned long flags; 328 void *private; 329 ftrace_func_t saved_func; 330 #ifdef CONFIG_DYNAMIC_FTRACE 331 struct ftrace_ops_hash local_hash; 332 struct ftrace_ops_hash *func_hash; 333 struct ftrace_ops_hash old_hash; 334 unsigned long trampoline; 335 unsigned long trampoline_size; 336 struct list_head list; 337 ftrace_ops_func_t ops_func; 338 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS 339 unsigned long direct_call; 340 #endif 341 #endif 342 }; 343 344 extern struct ftrace_ops __rcu *ftrace_ops_list; 345 extern struct ftrace_ops ftrace_list_end; 346 347 /* 348 * Traverse the ftrace_ops_list, invoking all entries. The reason that we 349 * can use rcu_dereference_raw_check() is that elements removed from this list 350 * are simply leaked, so there is no need to interact with a grace-period 351 * mechanism. The rcu_dereference_raw_check() calls are needed to handle 352 * concurrent insertions into the ftrace_ops_list. 353 * 354 * Silly Alpha and silly pointer-speculation compiler optimizations! 355 */ 356 #define do_for_each_ftrace_op(op, list) \ 357 op = rcu_dereference_raw_check(list); \ 358 do 359 360 /* 361 * Optimized for just a single item in the list (as that is the normal case). 362 */ 363 #define while_for_each_ftrace_op(op) \ 364 while (likely(op = rcu_dereference_raw_check((op)->next)) && \ 365 unlikely((op) != &ftrace_list_end)) 366 367 /* 368 * Type of the current tracing. 369 */ 370 enum ftrace_tracing_type_t { 371 FTRACE_TYPE_ENTER = 0, /* Hook the call of the function */ 372 FTRACE_TYPE_RETURN, /* Hook the return of the function */ 373 }; 374 375 /* Current tracing type, default is FTRACE_TYPE_ENTER */ 376 extern enum ftrace_tracing_type_t ftrace_tracing_type; 377 378 /* 379 * The ftrace_ops must be a static and should also 380 * be read_mostly. These functions do modify read_mostly variables 381 * so use them sparely. Never free an ftrace_op or modify the 382 * next pointer after it has been registered. Even after unregistering 383 * it, the next pointer may still be used internally. 384 */ 385 int register_ftrace_function(struct ftrace_ops *ops); 386 int unregister_ftrace_function(struct ftrace_ops *ops); 387 388 extern void ftrace_stub(unsigned long a0, unsigned long a1, 389 struct ftrace_ops *op, struct ftrace_regs *fregs); 390 391 392 int ftrace_lookup_symbols(const char **sorted_syms, size_t cnt, unsigned long *addrs); 393 #else /* !CONFIG_FUNCTION_TRACER */ 394 /* 395 * (un)register_ftrace_function must be a macro since the ops parameter 396 * must not be evaluated. 397 */ 398 #define register_ftrace_function(ops) ({ 0; }) 399 #define unregister_ftrace_function(ops) ({ 0; }) 400 static inline void ftrace_kill(void) { } 401 static inline void ftrace_free_init_mem(void) { } 402 static inline void ftrace_free_mem(struct module *mod, void *start, void *end) { } 403 static inline int ftrace_lookup_symbols(const char **sorted_syms, size_t cnt, unsigned long *addrs) 404 { 405 return -EOPNOTSUPP; 406 } 407 #endif /* CONFIG_FUNCTION_TRACER */ 408 409 struct ftrace_func_entry { 410 struct hlist_node hlist; 411 unsigned long ip; 412 unsigned long direct; /* for direct lookup only */ 413 }; 414 415 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS 416 unsigned long ftrace_find_rec_direct(unsigned long ip); 417 int register_ftrace_direct(struct ftrace_ops *ops, unsigned long addr); 418 int unregister_ftrace_direct(struct ftrace_ops *ops, unsigned long addr, 419 bool free_filters); 420 int modify_ftrace_direct(struct ftrace_ops *ops, unsigned long addr); 421 int modify_ftrace_direct_nolock(struct ftrace_ops *ops, unsigned long addr); 422 423 void ftrace_stub_direct_tramp(void); 424 425 #else 426 struct ftrace_ops; 427 static inline unsigned long ftrace_find_rec_direct(unsigned long ip) 428 { 429 return 0; 430 } 431 static inline int register_ftrace_direct(struct ftrace_ops *ops, unsigned long addr) 432 { 433 return -ENODEV; 434 } 435 static inline int unregister_ftrace_direct(struct ftrace_ops *ops, unsigned long addr, 436 bool free_filters) 437 { 438 return -ENODEV; 439 } 440 static inline int modify_ftrace_direct(struct ftrace_ops *ops, unsigned long addr) 441 { 442 return -ENODEV; 443 } 444 static inline int modify_ftrace_direct_nolock(struct ftrace_ops *ops, unsigned long addr) 445 { 446 return -ENODEV; 447 } 448 449 /* 450 * This must be implemented by the architecture. 451 * It is the way the ftrace direct_ops helper, when called 452 * via ftrace (because there's other callbacks besides the 453 * direct call), can inform the architecture's trampoline that this 454 * routine has a direct caller, and what the caller is. 455 * 456 * For example, in x86, it returns the direct caller 457 * callback function via the regs->orig_ax parameter. 458 * Then in the ftrace trampoline, if this is set, it makes 459 * the return from the trampoline jump to the direct caller 460 * instead of going back to the function it just traced. 461 */ 462 static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, 463 unsigned long addr) { } 464 #endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */ 465 466 #ifdef CONFIG_STACK_TRACER 467 468 extern int stack_tracer_enabled; 469 470 int stack_trace_sysctl(struct ctl_table *table, int write, void *buffer, 471 size_t *lenp, loff_t *ppos); 472 473 /* DO NOT MODIFY THIS VARIABLE DIRECTLY! */ 474 DECLARE_PER_CPU(int, disable_stack_tracer); 475 476 /** 477 * stack_tracer_disable - temporarily disable the stack tracer 478 * 479 * There's a few locations (namely in RCU) where stack tracing 480 * cannot be executed. This function is used to disable stack 481 * tracing during those critical sections. 482 * 483 * This function must be called with preemption or interrupts 484 * disabled and stack_tracer_enable() must be called shortly after 485 * while preemption or interrupts are still disabled. 486 */ 487 static inline void stack_tracer_disable(void) 488 { 489 /* Preemption or interrupts must be disabled */ 490 if (IS_ENABLED(CONFIG_DEBUG_PREEMPT)) 491 WARN_ON_ONCE(!preempt_count() || !irqs_disabled()); 492 this_cpu_inc(disable_stack_tracer); 493 } 494 495 /** 496 * stack_tracer_enable - re-enable the stack tracer 497 * 498 * After stack_tracer_disable() is called, stack_tracer_enable() 499 * must be called shortly afterward. 500 */ 501 static inline void stack_tracer_enable(void) 502 { 503 if (IS_ENABLED(CONFIG_DEBUG_PREEMPT)) 504 WARN_ON_ONCE(!preempt_count() || !irqs_disabled()); 505 this_cpu_dec(disable_stack_tracer); 506 } 507 #else 508 static inline void stack_tracer_disable(void) { } 509 static inline void stack_tracer_enable(void) { } 510 #endif 511 512 #ifdef CONFIG_DYNAMIC_FTRACE 513 514 void ftrace_arch_code_modify_prepare(void); 515 void ftrace_arch_code_modify_post_process(void); 516 517 enum ftrace_bug_type { 518 FTRACE_BUG_UNKNOWN, 519 FTRACE_BUG_INIT, 520 FTRACE_BUG_NOP, 521 FTRACE_BUG_CALL, 522 FTRACE_BUG_UPDATE, 523 }; 524 extern enum ftrace_bug_type ftrace_bug_type; 525 526 /* 527 * Archs can set this to point to a variable that holds the value that was 528 * expected at the call site before calling ftrace_bug(). 529 */ 530 extern const void *ftrace_expected; 531 532 void ftrace_bug(int err, struct dyn_ftrace *rec); 533 534 struct seq_file; 535 536 extern int ftrace_text_reserved(const void *start, const void *end); 537 538 struct ftrace_ops *ftrace_ops_trampoline(unsigned long addr); 539 540 bool is_ftrace_trampoline(unsigned long addr); 541 542 /* 543 * The dyn_ftrace record's flags field is split into two parts. 544 * the first part which is '0-FTRACE_REF_MAX' is a counter of 545 * the number of callbacks that have registered the function that 546 * the dyn_ftrace descriptor represents. 547 * 548 * The second part is a mask: 549 * ENABLED - the function is being traced 550 * REGS - the record wants the function to save regs 551 * REGS_EN - the function is set up to save regs. 552 * IPMODIFY - the record allows for the IP address to be changed. 553 * DISABLED - the record is not ready to be touched yet 554 * DIRECT - there is a direct function to call 555 * CALL_OPS - the record can use callsite-specific ops 556 * CALL_OPS_EN - the function is set up to use callsite-specific ops 557 * TOUCHED - A callback was added since boot up 558 * MODIFIED - The function had IPMODIFY or DIRECT attached to it 559 * 560 * When a new ftrace_ops is registered and wants a function to save 561 * pt_regs, the rec->flags REGS is set. When the function has been 562 * set up to save regs, the REG_EN flag is set. Once a function 563 * starts saving regs it will do so until all ftrace_ops are removed 564 * from tracing that function. 565 */ 566 enum { 567 FTRACE_FL_ENABLED = (1UL << 31), 568 FTRACE_FL_REGS = (1UL << 30), 569 FTRACE_FL_REGS_EN = (1UL << 29), 570 FTRACE_FL_TRAMP = (1UL << 28), 571 FTRACE_FL_TRAMP_EN = (1UL << 27), 572 FTRACE_FL_IPMODIFY = (1UL << 26), 573 FTRACE_FL_DISABLED = (1UL << 25), 574 FTRACE_FL_DIRECT = (1UL << 24), 575 FTRACE_FL_DIRECT_EN = (1UL << 23), 576 FTRACE_FL_CALL_OPS = (1UL << 22), 577 FTRACE_FL_CALL_OPS_EN = (1UL << 21), 578 FTRACE_FL_TOUCHED = (1UL << 20), 579 FTRACE_FL_MODIFIED = (1UL << 19), 580 }; 581 582 #define FTRACE_REF_MAX_SHIFT 19 583 #define FTRACE_REF_MAX ((1UL << FTRACE_REF_MAX_SHIFT) - 1) 584 585 #define ftrace_rec_count(rec) ((rec)->flags & FTRACE_REF_MAX) 586 587 struct dyn_ftrace { 588 unsigned long ip; /* address of mcount call-site */ 589 unsigned long flags; 590 struct dyn_arch_ftrace arch; 591 }; 592 593 int ftrace_set_filter_ip(struct ftrace_ops *ops, unsigned long ip, 594 int remove, int reset); 595 int ftrace_set_filter_ips(struct ftrace_ops *ops, unsigned long *ips, 596 unsigned int cnt, int remove, int reset); 597 int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, 598 int len, int reset); 599 int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, 600 int len, int reset); 601 void ftrace_set_global_filter(unsigned char *buf, int len, int reset); 602 void ftrace_set_global_notrace(unsigned char *buf, int len, int reset); 603 void ftrace_free_filter(struct ftrace_ops *ops); 604 void ftrace_ops_set_global_filter(struct ftrace_ops *ops); 605 606 enum { 607 FTRACE_UPDATE_CALLS = (1 << 0), 608 FTRACE_DISABLE_CALLS = (1 << 1), 609 FTRACE_UPDATE_TRACE_FUNC = (1 << 2), 610 FTRACE_START_FUNC_RET = (1 << 3), 611 FTRACE_STOP_FUNC_RET = (1 << 4), 612 FTRACE_MAY_SLEEP = (1 << 5), 613 }; 614 615 /* 616 * The FTRACE_UPDATE_* enum is used to pass information back 617 * from the ftrace_update_record() and ftrace_test_record() 618 * functions. These are called by the code update routines 619 * to find out what is to be done for a given function. 620 * 621 * IGNORE - The function is already what we want it to be 622 * MAKE_CALL - Start tracing the function 623 * MODIFY_CALL - Stop saving regs for the function 624 * MAKE_NOP - Stop tracing the function 625 */ 626 enum { 627 FTRACE_UPDATE_IGNORE, 628 FTRACE_UPDATE_MAKE_CALL, 629 FTRACE_UPDATE_MODIFY_CALL, 630 FTRACE_UPDATE_MAKE_NOP, 631 }; 632 633 enum { 634 FTRACE_ITER_FILTER = (1 << 0), 635 FTRACE_ITER_NOTRACE = (1 << 1), 636 FTRACE_ITER_PRINTALL = (1 << 2), 637 FTRACE_ITER_DO_PROBES = (1 << 3), 638 FTRACE_ITER_PROBE = (1 << 4), 639 FTRACE_ITER_MOD = (1 << 5), 640 FTRACE_ITER_ENABLED = (1 << 6), 641 FTRACE_ITER_TOUCHED = (1 << 7), 642 FTRACE_ITER_ADDRS = (1 << 8), 643 }; 644 645 void arch_ftrace_update_code(int command); 646 void arch_ftrace_update_trampoline(struct ftrace_ops *ops); 647 void *arch_ftrace_trampoline_func(struct ftrace_ops *ops, struct dyn_ftrace *rec); 648 void arch_ftrace_trampoline_free(struct ftrace_ops *ops); 649 650 struct ftrace_rec_iter; 651 652 struct ftrace_rec_iter *ftrace_rec_iter_start(void); 653 struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter); 654 struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter); 655 656 #define for_ftrace_rec_iter(iter) \ 657 for (iter = ftrace_rec_iter_start(); \ 658 iter; \ 659 iter = ftrace_rec_iter_next(iter)) 660 661 662 int ftrace_update_record(struct dyn_ftrace *rec, bool enable); 663 int ftrace_test_record(struct dyn_ftrace *rec, bool enable); 664 void ftrace_run_stop_machine(int command); 665 unsigned long ftrace_location(unsigned long ip); 666 unsigned long ftrace_location_range(unsigned long start, unsigned long end); 667 unsigned long ftrace_get_addr_new(struct dyn_ftrace *rec); 668 unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec); 669 670 extern ftrace_func_t ftrace_trace_function; 671 672 int ftrace_regex_open(struct ftrace_ops *ops, int flag, 673 struct inode *inode, struct file *file); 674 ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, 675 size_t cnt, loff_t *ppos); 676 ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, 677 size_t cnt, loff_t *ppos); 678 int ftrace_regex_release(struct inode *inode, struct file *file); 679 680 void __init 681 ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable); 682 683 /* defined in arch */ 684 extern int ftrace_dyn_arch_init(void); 685 extern void ftrace_replace_code(int enable); 686 extern int ftrace_update_ftrace_func(ftrace_func_t func); 687 extern void ftrace_caller(void); 688 extern void ftrace_regs_caller(void); 689 extern void ftrace_call(void); 690 extern void ftrace_regs_call(void); 691 extern void mcount_call(void); 692 693 void ftrace_modify_all_code(int command); 694 695 #ifndef FTRACE_ADDR 696 #define FTRACE_ADDR ((unsigned long)ftrace_caller) 697 #endif 698 699 #ifndef FTRACE_GRAPH_ADDR 700 #define FTRACE_GRAPH_ADDR ((unsigned long)ftrace_graph_caller) 701 #endif 702 703 #ifndef FTRACE_REGS_ADDR 704 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS 705 # define FTRACE_REGS_ADDR ((unsigned long)ftrace_regs_caller) 706 #else 707 # define FTRACE_REGS_ADDR FTRACE_ADDR 708 #endif 709 #endif 710 711 /* 712 * If an arch would like functions that are only traced 713 * by the function graph tracer to jump directly to its own 714 * trampoline, then they can define FTRACE_GRAPH_TRAMP_ADDR 715 * to be that address to jump to. 716 */ 717 #ifndef FTRACE_GRAPH_TRAMP_ADDR 718 #define FTRACE_GRAPH_TRAMP_ADDR ((unsigned long) 0) 719 #endif 720 721 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 722 extern void ftrace_graph_caller(void); 723 extern int ftrace_enable_ftrace_graph_caller(void); 724 extern int ftrace_disable_ftrace_graph_caller(void); 725 #else 726 static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; } 727 static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; } 728 #endif 729 730 /** 731 * ftrace_make_nop - convert code into nop 732 * @mod: module structure if called by module load initialization 733 * @rec: the call site record (e.g. mcount/fentry) 734 * @addr: the address that the call site should be calling 735 * 736 * This is a very sensitive operation and great care needs 737 * to be taken by the arch. The operation should carefully 738 * read the location, check to see if what is read is indeed 739 * what we expect it to be, and then on success of the compare, 740 * it should write to the location. 741 * 742 * The code segment at @rec->ip should be a caller to @addr 743 * 744 * Return must be: 745 * 0 on success 746 * -EFAULT on error reading the location 747 * -EINVAL on a failed compare of the contents 748 * -EPERM on error writing to the location 749 * Any other value will be considered a failure. 750 */ 751 extern int ftrace_make_nop(struct module *mod, 752 struct dyn_ftrace *rec, unsigned long addr); 753 754 /** 755 * ftrace_need_init_nop - return whether nop call sites should be initialized 756 * 757 * Normally the compiler's -mnop-mcount generates suitable nops, so we don't 758 * need to call ftrace_init_nop() if the code is built with that flag. 759 * Architectures where this is not always the case may define their own 760 * condition. 761 * 762 * Return must be: 763 * 0 if ftrace_init_nop() should be called 764 * Nonzero if ftrace_init_nop() should not be called 765 */ 766 767 #ifndef ftrace_need_init_nop 768 #define ftrace_need_init_nop() (!__is_defined(CC_USING_NOP_MCOUNT)) 769 #endif 770 771 /** 772 * ftrace_init_nop - initialize a nop call site 773 * @mod: module structure if called by module load initialization 774 * @rec: the call site record (e.g. mcount/fentry) 775 * 776 * This is a very sensitive operation and great care needs 777 * to be taken by the arch. The operation should carefully 778 * read the location, check to see if what is read is indeed 779 * what we expect it to be, and then on success of the compare, 780 * it should write to the location. 781 * 782 * The code segment at @rec->ip should contain the contents created by 783 * the compiler 784 * 785 * Return must be: 786 * 0 on success 787 * -EFAULT on error reading the location 788 * -EINVAL on a failed compare of the contents 789 * -EPERM on error writing to the location 790 * Any other value will be considered a failure. 791 */ 792 #ifndef ftrace_init_nop 793 static inline int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec) 794 { 795 return ftrace_make_nop(mod, rec, MCOUNT_ADDR); 796 } 797 #endif 798 799 /** 800 * ftrace_make_call - convert a nop call site into a call to addr 801 * @rec: the call site record (e.g. mcount/fentry) 802 * @addr: the address that the call site should call 803 * 804 * This is a very sensitive operation and great care needs 805 * to be taken by the arch. The operation should carefully 806 * read the location, check to see if what is read is indeed 807 * what we expect it to be, and then on success of the compare, 808 * it should write to the location. 809 * 810 * The code segment at @rec->ip should be a nop 811 * 812 * Return must be: 813 * 0 on success 814 * -EFAULT on error reading the location 815 * -EINVAL on a failed compare of the contents 816 * -EPERM on error writing to the location 817 * Any other value will be considered a failure. 818 */ 819 extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr); 820 821 #if defined(CONFIG_DYNAMIC_FTRACE_WITH_REGS) || \ 822 defined(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS) || \ 823 defined(CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS) 824 /** 825 * ftrace_modify_call - convert from one addr to another (no nop) 826 * @rec: the call site record (e.g. mcount/fentry) 827 * @old_addr: the address expected to be currently called to 828 * @addr: the address to change to 829 * 830 * This is a very sensitive operation and great care needs 831 * to be taken by the arch. The operation should carefully 832 * read the location, check to see if what is read is indeed 833 * what we expect it to be, and then on success of the compare, 834 * it should write to the location. 835 * 836 * When using call ops, this is called when the associated ops change, even 837 * when (addr == old_addr). 838 * 839 * The code segment at @rec->ip should be a caller to @old_addr 840 * 841 * Return must be: 842 * 0 on success 843 * -EFAULT on error reading the location 844 * -EINVAL on a failed compare of the contents 845 * -EPERM on error writing to the location 846 * Any other value will be considered a failure. 847 */ 848 extern int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, 849 unsigned long addr); 850 #else 851 /* Should never be called */ 852 static inline int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, 853 unsigned long addr) 854 { 855 return -EINVAL; 856 } 857 #endif 858 859 extern int skip_trace(unsigned long ip); 860 extern void ftrace_module_init(struct module *mod); 861 extern void ftrace_module_enable(struct module *mod); 862 extern void ftrace_release_mod(struct module *mod); 863 #else /* CONFIG_DYNAMIC_FTRACE */ 864 static inline int skip_trace(unsigned long ip) { return 0; } 865 static inline void ftrace_module_init(struct module *mod) { } 866 static inline void ftrace_module_enable(struct module *mod) { } 867 static inline void ftrace_release_mod(struct module *mod) { } 868 static inline int ftrace_text_reserved(const void *start, const void *end) 869 { 870 return 0; 871 } 872 static inline unsigned long ftrace_location(unsigned long ip) 873 { 874 return 0; 875 } 876 877 /* 878 * Again users of functions that have ftrace_ops may not 879 * have them defined when ftrace is not enabled, but these 880 * functions may still be called. Use a macro instead of inline. 881 */ 882 #define ftrace_regex_open(ops, flag, inod, file) ({ -ENODEV; }) 883 #define ftrace_set_early_filter(ops, buf, enable) do { } while (0) 884 #define ftrace_set_filter_ip(ops, ip, remove, reset) ({ -ENODEV; }) 885 #define ftrace_set_filter_ips(ops, ips, cnt, remove, reset) ({ -ENODEV; }) 886 #define ftrace_set_filter(ops, buf, len, reset) ({ -ENODEV; }) 887 #define ftrace_set_notrace(ops, buf, len, reset) ({ -ENODEV; }) 888 #define ftrace_free_filter(ops) do { } while (0) 889 #define ftrace_ops_set_global_filter(ops) do { } while (0) 890 891 static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, 892 size_t cnt, loff_t *ppos) { return -ENODEV; } 893 static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, 894 size_t cnt, loff_t *ppos) { return -ENODEV; } 895 static inline int 896 ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; } 897 898 static inline bool is_ftrace_trampoline(unsigned long addr) 899 { 900 return false; 901 } 902 #endif /* CONFIG_DYNAMIC_FTRACE */ 903 904 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 905 #ifndef ftrace_graph_func 906 #define ftrace_graph_func ftrace_stub 907 #define FTRACE_OPS_GRAPH_STUB FTRACE_OPS_FL_STUB 908 #else 909 #define FTRACE_OPS_GRAPH_STUB 0 910 #endif 911 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 912 913 /* totally disable ftrace - can not re-enable after this */ 914 void ftrace_kill(void); 915 916 static inline void tracer_disable(void) 917 { 918 #ifdef CONFIG_FUNCTION_TRACER 919 ftrace_enabled = 0; 920 #endif 921 } 922 923 /* 924 * Ftrace disable/restore without lock. Some synchronization mechanism 925 * must be used to prevent ftrace_enabled to be changed between 926 * disable/restore. 927 */ 928 static inline int __ftrace_enabled_save(void) 929 { 930 #ifdef CONFIG_FUNCTION_TRACER 931 int saved_ftrace_enabled = ftrace_enabled; 932 ftrace_enabled = 0; 933 return saved_ftrace_enabled; 934 #else 935 return 0; 936 #endif 937 } 938 939 static inline void __ftrace_enabled_restore(int enabled) 940 { 941 #ifdef CONFIG_FUNCTION_TRACER 942 ftrace_enabled = enabled; 943 #endif 944 } 945 946 /* All archs should have this, but we define it for consistency */ 947 #ifndef ftrace_return_address0 948 # define ftrace_return_address0 __builtin_return_address(0) 949 #endif 950 951 /* Archs may use other ways for ADDR1 and beyond */ 952 #ifndef ftrace_return_address 953 # ifdef CONFIG_FRAME_POINTER 954 # define ftrace_return_address(n) __builtin_return_address(n) 955 # else 956 # define ftrace_return_address(n) 0UL 957 # endif 958 #endif 959 960 #define CALLER_ADDR0 ((unsigned long)ftrace_return_address0) 961 #define CALLER_ADDR1 ((unsigned long)ftrace_return_address(1)) 962 #define CALLER_ADDR2 ((unsigned long)ftrace_return_address(2)) 963 #define CALLER_ADDR3 ((unsigned long)ftrace_return_address(3)) 964 #define CALLER_ADDR4 ((unsigned long)ftrace_return_address(4)) 965 #define CALLER_ADDR5 ((unsigned long)ftrace_return_address(5)) 966 #define CALLER_ADDR6 ((unsigned long)ftrace_return_address(6)) 967 968 static __always_inline unsigned long get_lock_parent_ip(void) 969 { 970 unsigned long addr = CALLER_ADDR0; 971 972 if (!in_lock_functions(addr)) 973 return addr; 974 addr = CALLER_ADDR1; 975 if (!in_lock_functions(addr)) 976 return addr; 977 return CALLER_ADDR2; 978 } 979 980 #ifdef CONFIG_TRACE_PREEMPT_TOGGLE 981 extern void trace_preempt_on(unsigned long a0, unsigned long a1); 982 extern void trace_preempt_off(unsigned long a0, unsigned long a1); 983 #else 984 /* 985 * Use defines instead of static inlines because some arches will make code out 986 * of the CALLER_ADDR, when we really want these to be a real nop. 987 */ 988 # define trace_preempt_on(a0, a1) do { } while (0) 989 # define trace_preempt_off(a0, a1) do { } while (0) 990 #endif 991 992 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 993 extern void ftrace_init(void); 994 #ifdef CC_USING_PATCHABLE_FUNCTION_ENTRY 995 #define FTRACE_CALLSITE_SECTION "__patchable_function_entries" 996 #else 997 #define FTRACE_CALLSITE_SECTION "__mcount_loc" 998 #endif 999 #else 1000 static inline void ftrace_init(void) { } 1001 #endif 1002 1003 /* 1004 * Structure that defines an entry function trace. 1005 * It's already packed but the attribute "packed" is needed 1006 * to remove extra padding at the end. 1007 */ 1008 struct ftrace_graph_ent { 1009 unsigned long func; /* Current function */ 1010 int depth; 1011 } __packed; 1012 1013 /* 1014 * Structure that defines a return function trace. 1015 * It's already packed but the attribute "packed" is needed 1016 * to remove extra padding at the end. 1017 */ 1018 struct ftrace_graph_ret { 1019 unsigned long func; /* Current function */ 1020 #ifdef CONFIG_FUNCTION_GRAPH_RETVAL 1021 unsigned long retval; 1022 #endif 1023 int depth; 1024 /* Number of functions that overran the depth limit for current task */ 1025 unsigned int overrun; 1026 unsigned long long calltime; 1027 unsigned long long rettime; 1028 } __packed; 1029 1030 /* Type of the callback handlers for tracing function graph*/ 1031 typedef void (*trace_func_graph_ret_t)(struct ftrace_graph_ret *); /* return */ 1032 typedef int (*trace_func_graph_ent_t)(struct ftrace_graph_ent *); /* entry */ 1033 1034 extern int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace); 1035 1036 #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1037 1038 struct fgraph_ops { 1039 trace_func_graph_ent_t entryfunc; 1040 trace_func_graph_ret_t retfunc; 1041 }; 1042 1043 /* 1044 * Stack of return addresses for functions 1045 * of a thread. 1046 * Used in struct thread_info 1047 */ 1048 struct ftrace_ret_stack { 1049 unsigned long ret; 1050 unsigned long func; 1051 unsigned long long calltime; 1052 #ifdef CONFIG_FUNCTION_PROFILER 1053 unsigned long long subtime; 1054 #endif 1055 #ifdef HAVE_FUNCTION_GRAPH_FP_TEST 1056 unsigned long fp; 1057 #endif 1058 #ifdef HAVE_FUNCTION_GRAPH_RET_ADDR_PTR 1059 unsigned long *retp; 1060 #endif 1061 }; 1062 1063 /* 1064 * Primary handler of a function return. 1065 * It relays on ftrace_return_to_handler. 1066 * Defined in entry_32/64.S 1067 */ 1068 extern void return_to_handler(void); 1069 1070 extern int 1071 function_graph_enter(unsigned long ret, unsigned long func, 1072 unsigned long frame_pointer, unsigned long *retp); 1073 1074 struct ftrace_ret_stack * 1075 ftrace_graph_get_ret_stack(struct task_struct *task, int idx); 1076 1077 unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx, 1078 unsigned long ret, unsigned long *retp); 1079 1080 /* 1081 * Sometimes we don't want to trace a function with the function 1082 * graph tracer but we want them to keep traced by the usual function 1083 * tracer if the function graph tracer is not configured. 1084 */ 1085 #define __notrace_funcgraph notrace 1086 1087 #define FTRACE_RETFUNC_DEPTH 50 1088 #define FTRACE_RETSTACK_ALLOC_SIZE 32 1089 1090 extern int register_ftrace_graph(struct fgraph_ops *ops); 1091 extern void unregister_ftrace_graph(struct fgraph_ops *ops); 1092 1093 /** 1094 * ftrace_graph_is_dead - returns true if ftrace_graph_stop() was called 1095 * 1096 * ftrace_graph_stop() is called when a severe error is detected in 1097 * the function graph tracing. This function is called by the critical 1098 * paths of function graph to keep those paths from doing any more harm. 1099 */ 1100 DECLARE_STATIC_KEY_FALSE(kill_ftrace_graph); 1101 1102 static inline bool ftrace_graph_is_dead(void) 1103 { 1104 return static_branch_unlikely(&kill_ftrace_graph); 1105 } 1106 1107 extern void ftrace_graph_stop(void); 1108 1109 /* The current handlers in use */ 1110 extern trace_func_graph_ret_t ftrace_graph_return; 1111 extern trace_func_graph_ent_t ftrace_graph_entry; 1112 1113 extern void ftrace_graph_init_task(struct task_struct *t); 1114 extern void ftrace_graph_exit_task(struct task_struct *t); 1115 extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu); 1116 1117 static inline void pause_graph_tracing(void) 1118 { 1119 atomic_inc(¤t->tracing_graph_pause); 1120 } 1121 1122 static inline void unpause_graph_tracing(void) 1123 { 1124 atomic_dec(¤t->tracing_graph_pause); 1125 } 1126 #else /* !CONFIG_FUNCTION_GRAPH_TRACER */ 1127 1128 #define __notrace_funcgraph 1129 1130 static inline void ftrace_graph_init_task(struct task_struct *t) { } 1131 static inline void ftrace_graph_exit_task(struct task_struct *t) { } 1132 static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { } 1133 1134 /* Define as macros as fgraph_ops may not be defined */ 1135 #define register_ftrace_graph(ops) ({ -1; }) 1136 #define unregister_ftrace_graph(ops) do { } while (0) 1137 1138 static inline unsigned long 1139 ftrace_graph_ret_addr(struct task_struct *task, int *idx, unsigned long ret, 1140 unsigned long *retp) 1141 { 1142 return ret; 1143 } 1144 1145 static inline void pause_graph_tracing(void) { } 1146 static inline void unpause_graph_tracing(void) { } 1147 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ 1148 1149 #ifdef CONFIG_TRACING 1150 enum ftrace_dump_mode; 1151 1152 #define MAX_TRACER_SIZE 100 1153 extern char ftrace_dump_on_oops[]; 1154 extern int ftrace_dump_on_oops_enabled(void); 1155 extern int tracepoint_printk; 1156 1157 extern void disable_trace_on_warning(void); 1158 extern int __disable_trace_on_warning; 1159 1160 int tracepoint_printk_sysctl(struct ctl_table *table, int write, 1161 void *buffer, size_t *lenp, loff_t *ppos); 1162 1163 #else /* CONFIG_TRACING */ 1164 static inline void disable_trace_on_warning(void) { } 1165 #endif /* CONFIG_TRACING */ 1166 1167 #ifdef CONFIG_FTRACE_SYSCALLS 1168 1169 unsigned long arch_syscall_addr(int nr); 1170 1171 #endif /* CONFIG_FTRACE_SYSCALLS */ 1172 1173 #endif /* _LINUX_FTRACE_H */ 1174